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Cgg Services Sa patents


Recent patent applications related to Cgg Services Sa. Cgg Services Sa is listed as an Agent/Assignee. Note: Cgg Services Sa may have other listings under different names/spellings. We're not affiliated with Cgg Services Sa, we're just tracking patents.

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Systems and methods for active cancellation of transient signals and dynamic loop configuration

A method and system for active cancellation of transient signals and dynamic loop configuration for geophysical exploration is disclosed. The method includes controlling a transmitter to transmit a waveform in a frequency spectrum during an on-time. ... Cgg Services Sa

Method and apparatus for unambiguously estimating seismic anisotropy parameters

The orientation of the symmetry axis of an underground formation including an hti layer is determined by comparing azimuthal fourier coefficient of inversion results in distinct source-receiver azimuth ranges with values expected from the hti assumption. A branch-stacking technique or prior knowledge may be used to select one of the anisotropy axis orientation values.. ... Cgg Services Sa

Reflection full waveform inversion methods with density and velocity models updated separately

A reflection full waveform inversion method updates separately a density model and a velocity model of a surveyed subsurface formation. The method includes generating a model-based dataset corresponding to the seismic dataset using a velocity model and a density model to calculate an objective function measuring the difference between the seismic dataset and the model-based dataset. ... Cgg Services Sa

Apparatus and method for determining earth's near-surface properties with on-time measurements from airborne time-domain electromagnetic data

A device and method for calculating electrical properties of a surveyed underground formation. The method includes selecting a waveform having multiple current transition rates; placing a time-domain electromagnetic (tem) system above the underground formation while generating with a transmitter a transient primary magnetic field during an on-time period and no magnetic field during a following off-time period, due to the waveform; and recording with a receiver magnetic related data generated by the earth as a result of the transient primary magnetic field. ... Cgg Services Sa

Multi-sensor system for airborne geophysical prospecting and method

A multi-sensor electromagnetic (em) system and method for measuring gradients of em signals. The multi-sensor em system includes a frame; a transmitter device attached to the frame and configured to generate a primary em field; a receiver device attached to the frame and configured to record a secondary em field generated by the earth after being excited by the primary em field; and a gradient sensor device attached to the frame and configured to record a gradient of the secondary em field.. ... Cgg Services Sa

Device and method for model-based deblending

Computing device, computer instructions and method for removing cross-talk noise from seismic data and generating an image of a surveyed subsurface. The method includes receiving input seismic data d generated by firing one or more seismic sources so that source energy is overlapping, and the input seismic data d is recorded with seismic sensors over the subsurface; generating a cross-talk noise model n by replacing at least one original shot gather with a reconstructed shot gather; subtracting the cross-talk noise model n from the input seismic data d to attenuate coherent cross-talk noise to obtain processed seismic data dp; deblending the processed seismic data dp with a deblending algorithm to attenuate a residual noise to obtain deblended seismic data dd; and generating the image of the subsurface based on the deblended seismic data dd.. ... Cgg Services Sa

Method and apparatus for simultaneous geostatistical inversion of time-lapse seismic data

Properties of underground formations are obtained by performing simultaneous geostatistical inversion of two or more seismic datasets acquired over the same area. These methods enable simultaneous estimating quantitative changes in a hydrocarbon-producing field.. ... Cgg Services Sa

Modeling an elastic stiffness tensor in a transverse isotropic subsurface medium

Modeling an elastic stiffness tensor in a transverse isotropic subsurface medium acquires well log data for at least one well passing through the transverse isotropic subsurface medium. The transverse isotropic subsurface medium is divided into an effective anisotropic layer and an isotropic layer. ... Cgg Services Sa

Apparatus and method for compensating for receiver motion in airborne electromagnetic systems

A computing device and method for removing noise associated with an excitation signal and its odd harmonics. A computing system for processing electromagnetic (em) signals includes an interface that receives raw data indicative of a time rate of change of a magnetic field as recorded with a receiver coil while airborne, wherein the magnetic field includes a primary source excitation; and a processor connected to the interface. ... Cgg Services Sa

Water-fillable cable fairing and method

A water-fillable fairing configured to be mounted on a cable has a fairing body and an inlet. The fairing body is at least partially made of a flexible material, and is able to hold water at a higher pressure than an average pressure outside the fairing body, while the cable is towed. ... Cgg Services Sa

Transverse vibration attenuation mechanism and method for marine seismic acquisition system

A front-end gear connects a streamer to a vessel. The front-end gear includes a lead-in that connects to the streamer, a first bend limiting element attached to the lead-in and to a float that floats at a sea surface, a second bend limiting element attached to the lead-in, a distance l away from the first bend limiting element, and a depressor attached to the second bend limiting element. ... Cgg Services Sa

Flush design of an autonomous underwater vehicle with negative buoyancy for marine seismic surveys

An autonomous underwater vehicle (auv) for recording seismic signals during a marine seismic survey. The auv includes a body extending along an axis x and having a front region, a middle region, and a tail region, wherein the middle region is sandwiched between the front region and the tail region along the x axis. ... Cgg Services Sa

Three-dimensional seismic acquisition system and method with dynamic resolution

System and method for calculating a pre-plot for a marine seismic acquisition system. The method includes receiving as input a first number of autonomous underwater vehicles (auvs) and a second number of source vessels; receiving a geometry of an area to be surveyed; receiving a set of naturally different regions and/or humanly set targets for the area to be surveyed; calculating a first sailing path for an auv of the first number of auvs; calculating a second sailing path for a source vessel of the second number of source vessels, based on the set of naturally different regions and/or humanly set targets; and entering the pre-plot into a navigation system of the auv and the source vessel so that the auv and source vessel dynamically change an offset distance between them, while sailing during a seismic survey, based on the naturally different regions and/or humanly set targets.. ... Cgg Services Sa

Vibratory source for non-vertical boreholes and method

A reaction mass seismic survey source that is located in an underground casing. The seismic source includes a non-planar base plate; a reaction mass located on the non-planar base plate; and a flextensional element housed in a recess of the reaction mass and configured to vibrate the non-planar base plate when actuated, to generate seismic waves underground.. ... Cgg Services Sa

02/01/18 / #20180031731

System and method for incorporating ground penetrating radar equipment on seismic source

A system and method for incorporating ground penetrating radar equipment on seismic source is disclosed. The system includes a seismic source platform, a seismic source coupled to the seismic source platform and configured to emit a seismic signal, a transmitter coupled to the seismic source platform using at least one piece of mounting equipment and configured to emit electromagnetic signals, an ground penetrating radar antenna coupled to the seismic source platform using at least one piece of mounting equipment and configured to receive reflected electromagnetic signals, and a ground penetrating radar recorder coupled to the seismic source platform and configured to record reflected electromagnetic signals.. ... Cgg Services Sa

01/18/18 / #20180017692

Device and method for estimating pre-stack wavelet model from seismic gathers

Computing device, computer instructions and method for calculating a characteristic of the earth based on recorded seismic data related to a subsurface. The method includes receiving well log data; calculating a statistical model based on the well log data; calculating a reflectivity r of the subsurface based on an intercept a and a gradient b of the statistical model; calculating a reconstructed gather d based on the reflectivity r and a wavelet model w; calculating parameters wn of the wavelet model w with a first inversion function c that depends on (i) the reconstructed gather d, (ii) a recorded gather d0, and (iii) a probability density function (pdf) associated with the statistical model; and calculating the characteristic of the earth for the subsurface, based on the parameters wn of the wavelet model w and the recorded gather d0.. ... Cgg Services Sa

12/28/17 / #20170371071

Towed remote controlled vehicle for seismic spread intervention and method

Method and seismic data acquisition system includes a streamer spread including (i) a streamer having receivers for recording seismic data and (ii) a connecting cable connecting the streamer to a towing vessel; a collar device configured to move along the connecting cable, between the towing vessel and the streamer; and a remotely operated vehicle (rov) attached to the collar device with an umbilical and configured to carry an interchangeable payload.. . ... Cgg Services Sa

12/28/17 / #20170371070

Method and system for adjusting seismic source pilot and drive signals using measured data

Computing device, software and method for calibrating pilot and drive signals of a marine seismic source array using measured data. The method includes receiving a source array geometry and a model of the source array; estimating an initial overall response of the source array based on numerical simulations, the model of the source array, and the source array geometry; generating the pilot and drive signals for the source array based on the initial overall response; determining individual responses of the source elements, which form the source array, based on the source array geometry, the model of the source array, and first measured data; calculating an actual overall response of the source array based on the pilot and drive signals, the model of the source array and second measured data; and adjusting the pilot and drive signals based on the actual overall response of the source array.. ... Cgg Services Sa

12/28/17 / #20170371055

Processing seismic data acquired using moving non-impulsive sources

Methods for processing seismic data acquired with non-impulsive moving sources are provided. Some methods remove cross-talk noise from the seismic data using emitted signal data and an underground formation's response estimate, which may be iteratively enhanced. ... Cgg Services Sa

12/28/17 / #20170371053

Methods and data processing apparatus for seismic signal separation

There is a method for correcting seismic wave propagation paths through the earth. The method includes determining a first fixed shooting sequence for a first bandlimited seismic source; determining a second shooting sequence for a second bandlimited seismic source, wherein the second shooting sequence includes second shooting positions that correspond to second energy emissions, and the second energy emissions differ from the first energy emissions in at least one of an emission time, phase and amplitude; receiving raw seismic data recorded with seismic receivers and generated as a result of the first and second energy emissions, wherein the raw seismic data is indicative of seismic wave paths from the first and second bandlimited seismic sources to the seismic receivers; separating the raw seismic data into a first bandlimited set corresponding to the first bandlimited seismic source and a second bandlimited set corresponding to the second bandlimited seismic source; and correcting the seismic wave paths, from the first and second bandlimited seismic sources to the seismic receivers, based on at least one of the first and second bandlimited sets.. ... Cgg Services Sa

12/28/17 / #20170371052

Method for updating velocity model used for migrating data in 4d seismic data processing

A modified velocity model different from an initial velocity model is determined for migrating a vintage of 4d seismic data. The modified velocity model minimizes differences between a reference vintage migrated using the initial velocity model and the vintage migrated using the modified velocity model.. ... Cgg Services Sa

12/28/17 / #20170371048

Buried seismic sensor and method

A seismic device for recording seismic waves includes a housing to be located in a fill-in material and/or a formation, a first assembly located inside the housing, and a first anchor attached to the first assembly and exiting through the housing to contact the fill-in material and/or the formation. The first assembly is configured to measure a quantity indicative of a strain experienced by the formation due to the seismic waves.. ... Cgg Services Sa

12/21/17 / #20170363760

Multi-vessel seismic data acquisition system

A multi-vessel seismic data acquisition system having a first vessel towing a streamer containing a plurality of seismic receivers and a pair of seismic sources along a first shot line. At least one additional vessel tows only a single seismic source. ... Cgg Services Sa

12/21/17 / #20170363759

System and method for seismic interferometry optimized data acquisition

Systems and methods for improving or generating an image of a surveyed subsurface based on seismic interferometry. A method includes actuating interferometry-based sources over an area to be surveyed to generate seismic waves; recording seismic signals due to the interferometry-based sources, with seismic receivers; selecting traces corresponding to a pair of seismic receivers and an interferometry-based source such that ray paths between the interferometry-based source and the pair of seismic receivers contribute to a green's function between the two receivers of the pair; cross-correlating the traces for calculating an earth's response associated with a ray propagating from a first seismic receiver of the pair to a second receiver of the pair; and generating an image based on the calculated earth's response.. ... Cgg Services Sa

12/14/17 / #20170357020

Estimating a time variant signal representing a seismic source

A method for estimating a time variant signal representing a seismic source obtains seismic data recorded by at least one receiver and generated by the seismic source, the recorded seismic data comprising direct arrivals and derives the time variant signal using an operator that relates the time variant signal to the acquired seismic data, the operator constrained such that the time variant signal is sparse in time.. . ... Cgg Services Sa

12/14/17 / #20170357017

Systems and methods for improved coupling of geophysical sensors, where the shaft is open at the foot and couples to the sensor base plate at the head

A system and method for improved coupling of geophysical sensors is disclosed. The method includes determining conditions at an installation location, and selecting a sensor assembly. ... Cgg Services Sa

11/30/17 / #20170343690

Device and method for smart picking surface waves dispersion curves

Device and method for calculating a set of surface wave dispersion curves. The method includes receiving seismic data recorded with seismic sensors over an area to be surveyed; selecting region units that cover the area to be surveyed; gathering traces for the region units; processing in a computing device the traces to obtain a set of candidate measurements for each region unit; teaching a decision algorithm based on a first subset of the set of candidate measurements; and calculating the set of surface wave dispersion curves by running the decision algorithm on a second subset of the set of candidate measurements.. ... Cgg Services Sa

11/30/17 / #20170343688

Mechanism and method for reduced air consumption in a marine vibratory source element

A method and source element for generating seismic waves in water. The source element includes a housing having an opening; an acoustic piston closing the opening; an actuating mechanism located inside the housing and configured to actuate the acoustic piston; and a decoupling mechanism interposed between the acoustic piston and the actuating mechanism. ... Cgg Services Sa

11/09/17 / #20170322331

Joint inversion of compressional and shear seismic data in native time domains

Pp and ps seismic data are jointly inverted in a stratigraphic grid, using different time axes for pp and ps reflections. A ratio of pp and of ps waves'travel times inside a same layer cell maintained to be a function of a ratio of a p-wave propagation velocity and of an s-wave propagation velocity therein. ... Cgg Services Sa

10/26/17 / #20170311484

Methods and system for oil immersion cooling

A system for immersion cooling computing system equipment includes a container containing a volume of immersion cooling fluid. At least one heat generating computing system equipment component and a liquid-liquid heat exchanger are disposed in the volume of immersion cooling fluid. ... Cgg Services Sa

10/26/17 / #20170311479

Methods and system for oil immersion cooling

A system for immersion cooling computing system equipment includes a container, a volume of cooling liquid disposed in the container, a computing system equipment holder disposed in the volume of cooling liquid and a liquid-liquid heat exchanger attached to and supported by the computing system equipment holder. The liquid-liquid heat exchanger is disposed in the volume of cooling liquid.. ... Cgg Services Sa

10/26/17 / #20170307775

System and method for adjusting the rope spread of seismic streamers

A seismic survey system includes a set of streamers coupled via lead-in cables to a towing vessel. An active adjustment system adjusts a distance separating at least two of the streamers of the set of streamers from each other. ... Cgg Services Sa

10/26/17 / #20170307773

Multi-vintage energy mapping

Multi-vintage energy mapping selects a first seismic survey data and a second seismic survey dataset from a plurality of seismic survey datasets. The first seismic survey dataset includes a set of first energies associated with a first seismic survey geometry, and the second seismic survey dataset includes a set of second energies associated with a second seismic survey geometry. ... Cgg Services Sa

10/05/17 / #20170285198

Method and system for marine seismic acquisition

A seismic acquisition system for acquiring seismic data includes a streamer spread including first and second streamers, each of the first and second streamers having at least one seismic receiver and at least one position control device, and a seismic source located within an area underlined by the streamer spread and configured to generate seismic waves. The streamer spread and the source are towed independent of each other, a streamer separation ds between the first and second streamers varies along a length of the spread to comply with a given survey characteristic, and the streamer separation varies from a front-end value ds(f) at a front-end of the spread, to a middle of the spread value ds(o), to a back-end value ds(b) at a back-end of the spread, and the middle of the spread value is smaller than the front-end value and smaller than the back-end value.. ... Cgg Services Sa

09/28/17 / #20170276774

Method and device for boosting low-frequencies for a marine seismic survey

Systems and methods for boosting low content of received signals involve a vessel (102) towing port side (205) and starboard side (210) impulsive source arrays. The port side and starboard side impulsive source arrays are selectively actuated for a plurality of sequential shots having different signatures.. ... Cgg Services Sa

09/21/17 / #20170269248

Steering for coverage in seismic surveys

A method for steering a marine seismic acquisition system by determining a steering point associated with towed seismic equipment is described. Coverage boundaries for a current line in a seismic survey and for an already acquired adjacent line in the seismic survey are computed. ... Cgg Services Sa

09/21/17 / #20170269247

Demultiple using up/down separation of towed variable-depth streamer data

Methods and systems for processing data acquired using a variable-depth streamer, obtain up-going and down-going wavefields at a predetermined datum, and use them to identify multiples included in the up-going wavefield. An image of a geological formation under the seabed is then generated using the data from which the multiples have been removed, and/or the multiples.. ... Cgg Services Sa

09/07/17 / #20170254914

System and method for refining positions of marine seismic receivers

Seismic survey system and method for adjusting positions of plural autonomous receiver nodes (arns) of a seismic survey system. The method includes calculating first travel-times of direct arrivals of seismic waves, based on (i) offsets between shooting positions of seismic sources and recording positions of the plural arns, and (ii) a speed of the seismic waves in water; estimating second travel-times of the direct arrivals, based on seismic data recorded by the plural arns; estimating, in a computing device, positioning errors of one or more of the plural arns by applying an inversion algorithm to a misfit between the first and second travel-times; and adjusting the recording positions of the one or more arns with the positioning errors.. ... Cgg Services Sa

08/31/17 / #20170248723

Positioning along a streamer using surface references

Positioning along a towed streamer is enhanced by using acoustic signals emitted from a surface vehicle that is not physically linked to the survey equipment. The surface vehicle navigates to remain above a target location between the streamer's head and its tail in the towing direction. ... Cgg Services Sa

08/31/17 / #20170248717

Methods and systems of detecting a microseismic event using an iterative non-linear inversion algorithm

The present disclosure includes a method including determining a spatial region for analysis and selecting a segment of time for analysis, analyzing and correcting a plurality of traces from a plurality of receivers using an iterative non-linear inversion algorithm, wherein each iteration of the non-linear algorithm corrects the plurality of traces using at least one set of parameters defining a microseismic event, determining whether a final stack value of the plurality of traces corrected based on the at least one set of parameters of a final iteration of the iterative non-linear inversion algorithm exceeds a predetermined threshold and upon a determination that the final stack value exceeds the predetermined threshold, detecting a microseismic event defined by the at least one set of parameters of final iteration. The present disclosure also includes associated systems and computer-readable media.. ... Cgg Services Sa

08/31/17 / #20170248716

Device and method for weighted sparse inversion for seismic processing

Computing device, computer instructions and method for processing input seismic data d. The method includes receiving the input seismic data d recorded in a data domain, solving a linear inversion problem constrained by input seismic data d to obtain a model domain and its energy, wherein the linear inversion problem is dependent on sparseness weights that are simultaneously a function of both time and frequency, reverse transforming the model domain energy to the data domain, and generating an image of a surveyed subsurface based on the reverse transformed model domain energy.. ... Cgg Services Sa

08/31/17 / #20170248715

Simultaneous multi-vintage time-lapse full waveform inversion

Simultaneous inversion of multi-vintage seismic data obtains seismic data for vintages and generates an initial earth model for each vintage. A cost function includes a data norm term having for at least one pair of vintages of seismic data a difference norm between a difference in obtained seismic data for the at least one pair of vintages and a difference in modeled seismic data for the at least one pair of vintages. ... Cgg Services Sa

08/31/17 / #20170248710

Device and method for mitigating seismic survey interference

A computing system and method for mitigating, in a first seismic survey, cross-talk generated by a second seismic survey. The method includes performing the first seismic survey with a first survey seismic source driven by a first survey pilot sweep, performing the second seismic survey with a second survey seismic source, simultaneously with the first seismic survey, recording with first survey seismic sensors (i) first survey seismic signals that originate from the first survey seismic source and (ii) second survey seismic signals that originate from the second survey seismic source, selecting another first survey pilot sweep, which has less cross-correlation noise with the second survey seismic signals than the first survey pilot sweep, and continuing the first seismic survey with the another first survey pilot sweep.. ... Cgg Services Sa

08/24/17 / #20170242144

Auv based seismic acquisition system and method

An autonomous underwater vehicle (auv) for guiding other auvs during a marine seismic survey. The guiding auv includes a housing; a propulsion system located inside the housing; and an acoustic positioning system attached to an outside the housing. ... Cgg Services Sa

08/24/17 / #20170242141

Seismic migration using an indexed matrix

Systems and methods for performing seismic migration using an indexed matrix are disclosed. The method includes receiving a seismic trace from a receiver, determining a discretized position of the receiver, and determining a discretized position of a seismic source. ... Cgg Services Sa

08/17/17 / #20170235003

Seismic data acquisition for compressive sensing reconstruction

A survey plan is designed and potentially adjusted so that seismic data acquired during the survey include inline and cross-line seismic data irregularities suitable for compressive sensing reconstruction. At least one of the inline and cross-line irregularities is dynamic and may be due to source, vessel(s) and/or streamer steering.. ... Cgg Services Sa

08/03/17 / #20170219732

Device and method for correcting seismic data for variable air-water interface

Computing device, computer instructions and method for correcting an image, of a surveyed surface, due to a free-surface reflection. The method includes calculating a free surface reflection operator for a seismic source displaced in water based on a position of the source, and an air-water interface datum; receiving recorded seismic data d recorded with seismic sensors (r), wherein the recorded seismic data is associated with a pressure and/or a particle motion produced by a seismic wave in earth; correcting the recorded seismic data d based on the free surface reflection operator to obtain transformed seismic data; and generating an image of the surveyed subsurface, based on the transformed seismic data, wherein the image is indicative of various layers of the earth. ... Cgg Services Sa

08/03/17 / #20170219728

Complex pore geometry modeling by continuously varying inclusions (ci) method for elastic parameter prediction using inclusion models

Predicting elastic parameters of a subsurface includes modelling changes in the shear modulus and changes in the bulk modulus of the subsurface as a combination of a host medium shear modulus and host medium bulk modulus and a plurality of inclusion shear moduli and inclusion bulk moduli. Each inclusion shear modulus and inclusion bulk modulus associated with a unique inclusion geometry. ... Cgg Services Sa

08/03/17 / #20170219727

Multi-stack (broadband) wavelet estimation method

Computing device, computer instructions and method for estimating a broadband wavelet associated with a given seismic data set. The method includes receiving broadband seismic data; constructing and populating a misfit function; calculating the broadband wavelet based on the misfit function and the broadband seismic data; and estimating physical reservoir properties of a surveyed subsurface based on the broadband wavelet. ... Cgg Services Sa

08/03/17 / #20170219726

Systems and methods for improved coupling of geophysical sensors

A system and method for coupling geophysical sensors is provided. A method for deploying a geophysical sensor includes treating an installation location with a soil stabilizing material. ... Cgg Services Sa

07/13/17 / #20170199301

Biofouling removal mechanism

A biofouling removal mechanism includes at least one cleaning element configured to remove accumulated biofouling from a structure and a cleaning element support structure attached to the cleaning element. The cleaning element support structure is configured to secure the cleaning element to the structure, to guide the cleaning element along the structure and to accommodate changes in at least one of a size and a shape of the structure as the cleaning element passes along the structure.. ... Cgg Services Sa

07/13/17 / #20170199290

Systems and methods for attenuating noise using interferometric estimation

Systems and methods are disclosed for attenuating noise during seismic acquisition. The method includes compiling a seismic data set from data received by a plurality of receivers. ... Cgg Services Sa

07/13/17 / #20170199289

Ava compliant pre-stack frequency spectrum enhancement of seismic data

Generating spectrally enhanced seismic data expresses seismic data as a convolution of reflectivity and a seismic source wavelet. This seismic source wavelet varies over a sampling interval and defining a total amount of energy over the sampling interval. ... Cgg Services Sa

07/06/17 / #20170192121

Low-frequency receiver coil suspension system

An electromagnetic (em) receiver system for measuring em signals. The em receiver system includes a platform; a coil for measuring em signals; and first to third suspension mechanisms located between the platform and the coil so that the coil oscillates relative to the platform, and the first to third suspension mechanisms attenuate motion induced noise introduced by towing the receiver system above ground.. ... Cgg Services Sa

06/29/17 / #20170184747

Method and apparatus for directional designature

Methods and apparatuses for directional designature in shot domain are provided. Azimuth and take-off angles are calculated for each record in the seismic data. ... Cgg Services Sa

06/22/17 / #20170179768

Portable charging system and hybrid battery

A portable charging system has a first part with an electrical power source and a first housing having a first three dimensional shape. A second part that is separate from and independent of the first part has a second housing with a second three dimensional shape comprising a complementary shape to the first three dimensional shape and a charge storage unit containing an ultracapacitor. ... Cgg Services Sa

06/15/17 / #20170168185

Modeling an elastic stiffness tensor in a transverse isotropic subsurface medium

Modeling an elastic stiffness tensor in a transverse isotropic subsurface medium acquires well log data for at least one well passing through the transverse isotropic subsurface medium. The transverse isotropic subsurface medium is divided into an effective anisotropic layer and an isotropic layer. ... Cgg Services Sa

06/15/17 / #20170168174

Method and system for generating low-frequency seismic signals with a flow-modulated source

A low-frequency source element is configured to generate seismic waves in water. The low-frequency source element includes includes a hydraulic reservoir configured to hold a given fluid volume; a compliant chamber configured to hold a given gas volume and to accommodate volume changes of the given fluid volume; a rotational kinetic energy actuator configured to impart rotational kinetic energy to the fluid volume; and a flow modulator device configured to transform part of the rotational kinetic energy of the fluid volume into translational energy to generate an acoustic signal.. ... Cgg Services Sa

06/15/17 / #20170168173

System and method for generating simultaneous plural frequencies in seismic exploration

A system and method for generating simultaneous plural frequencies in seismic exploration is disclosed. The method includes configuring a seismic source to emit a seismic signal that includes multiple frequencies emitted substantially simultaneously. ... Cgg Services Sa

06/08/17 / #20170160415

Systematic departure from pattern regularity in seismic data acquisition

During seismic data acquisition the seismic sources and/or seismic receivers are deployed according to an irregular arrangement departing in a predetermined manner from repetitive spatial patterns formed by or within groups of adjacent among the seismic sources or adjacent among the receivers. Additionally or alternatively, source activation moments of the sources within a series of source firing time intervals are determined using golomb ruler sequences or a non-linear inversion.. ... Cgg Services Sa

06/08/17 / #20170160414

Method and device for simultaneously attenuating noise and interpolating seismic data

Seismic survey data is processed to simultaneously attenuate noise and interpolate the data. A frequency slice of one of a plurality of overlapping subvolumes formed from the seismic survey data is selected. ... Cgg Services Sa

06/08/17 / #20170160413

Method and apparatus for analyzing fractures using avoaz inversion

Fracture orientation ambiguity in the results of amplitude variation with offset and azimuth inversion is overcome by using additional geological information. Methods, apparatus and executable codes stored on non-transitory media cause, for each interface encountered by traces in a cmp gather, calculating angle-dependent azimuthal fourier coefficients, performing a nonlinear inversion of amplitude versus offset and azimuth, avoaz, equations built using the angle-dependent azimuthal fourier coefficients to determine possible fracture orientations, and selecting one of the possible fracture orientations using constraints based on the additional geological information.. ... Cgg Services Sa

06/01/17 / #20170153344

Time-lapse simultaneous inversion of amplitudes and time shifts constrained by pre-computed input maps

Global inversion of multi-vintage seismic data uses simulated annealing to minimize a cost function simultaneously for all vintages and all angle stacks to yield values of geophysical properties. Each vintage is generated from an independent seismic survey of a subsurface structure conducted over a distinct period of time and includes seismic traces and angle stacks. ... Cgg Services Sa

05/18/17 / #20170140079

Ensemble-based multi-scale history-matching device and method for reservoir characterization

Device, medium and method for generating a multidimensional image of a subsurface of the earth. The method includes receiving data related to the subsurface of the earth; generating an ensemble of realizations associated with the subsurface based on the received data; applying wavelet re-parametrization to spatial properties of the members of the ensemble to calculate a set of wavelet coefficients; reconstructing the spatial properties of the ensemble based on a subset of the wavelet coefficients; applying a forward simulator to the reconstructed spatial properties of the ensemble for estimating one or more physical parameters of the subsurface; applying an ensemble-based optimization method to update the subset of the wavelet coefficients; and generating multidimensional image of the subsurface based on the updated subset of the wavelet coefficients.. ... Cgg Services Sa

05/18/17 / #20170139065

Adaptive ensemble-based method and device for highly-nonlinear problems

Device, medium and method for generating an image of a subsurface of the earth. The method includes generating an ensemble of realizations (m) based on data related to the subsurface; applying an objective function (o) to members (m) of the ensemble of realizations (m) and corresponding estimated data to estimate a mismatch; selecting a best sensitivity matrix (g) from a plurality of sensitivity matrices associated with the objective function (o) and the ensemble of realizations (m); updating realization parameters (mpr), which are used as input for a forward model (f), to calculate the corresponding estimated data, based on the best sensitivity matrix (g); and generating an image of the subsurface based on (1) the data related to the subsurface of the earth and (2) the forward model (f) with updated realization parameters (mpr).. ... Cgg Services Sa

05/11/17 / #20170131418

Device and method for full waveform inversion

Computing device, computer instructions and method for determining an image of a surveyed subsurface. The method includes receiving recorded wave fields d recorded with seismic sensors over the subsurface; generating a series of modified recorded wave fields dn based on the recorded wave fields d; iteratively applying an objective function fi to (1) one element di of the series of modified recorded wave fields dn and (2) predicted wave fields pmi, where “i” is an index associated with a given iteration; calculating with a computing device an updated velocity model mi+1 based on a previous velocity model mi and a step length; and producing the image of the subsurface based on the recorded wave fields d and the updated velocity model mi+1. ... Cgg Services Sa

05/11/17 / #20170131417

Systems and methods for seismic exploration in difficult or constrained areas

A method for performing a seismic survey using at least one carrier which includes a seismic source. The method includes: deploying each of the at least one carriers by the delivery vehicle, wherein each of the at least one carriers includes: a plurality of supports configured to enable a baseplate to contact ground, wherein the baseplate is formed by each foot of the plurality of supports; a seismic source which includes a lower portion configured to push through unconsolidated materials and configured to contact the ground; and a power source configured to operate the seismic source; and transmitting at least one seismic signal from the seismic source.. ... Cgg Services Sa

05/04/17 / #20170123090

Seismic data least-square migration method and device

Computing device, computer instructions and method for calculating an image of a subsurface based on least square migration and image de-convolution using a matching operator f. The method includes receiving seismic data d; computing a first image m of the subsurface based on the seismic data d; computing a second image h of the subsurface based on the first image m; applying a transform operation to the first and second images m and h to obtain a first transform of the first image and a second transform of the second image; calculating the matching operator f by matching the first transform of the first image to the second transform of the second image; and generating an updated image mupdated of the subsurface based on the matching operator f and the first transform of the first image.. ... Cgg Services Sa

04/27/17 / #20170115418

Seismic data processing using matching filter based cost function optimization

A method for processing seismic data from a subsurface using least squares migration or wave equation migration velocity analysis over a cost function comprising a function of a matching filter by iteratively updating the reflectivity model velocity model to yield an updated reflectivity model or updated velocity model that matches the observed seismic data.. . ... Cgg Services Sa

04/20/17 / #20170108600

Methods and systems for a sea-floor seismic source

Systems and methods for a sea-floor seismic source are provided. The seismic source system includes a housing (102) having an internal cavity (104). ... Cgg Services Sa

04/13/17 / #20170102472

Device and method for deghosting variable depth streamer data

Computing device, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method may include receiving input seismic data recorded by seismic receivers that located at different depths (zr), generating migration data (du) and mirror migration data (dd) from the input seismic data, deriving a ghost free model (m) based on simultaneously using the migration data (du) and mirror migration data (dd), generating primary (p) and ghost (g) datasets based on the ghost free model (m), simultaneously adaptively subtracting the primary (p) and ghost (g) datasets from the migration data (du) to provide adapted primary (p′1 and p′2) and adapted residual (r′1 and r′2) datasets and generating a final image (f) of the subsurface based on the adapted primary (p′1 and p′2) and the adapted residual (r′1 and r′2) datasets.. ... Cgg Services Sa

04/13/17 / #20170102471

Method and apparatus for characterizing azimuthal anisotropy using statistical moments

A method for evaluating anisotropy parameters using statistical moments calculates second and third central moments using reflectivity values associated with pairs of incidence and azimuth angles. The method further determines tangential and normal weaknesses for the location using the calculated second and third central moments for different incident angles. ... Cgg Services Sa

04/13/17 / #20170102469

Source for marine seismic acquisition and method

A method for generating acoustic waves under water includes actuating first and second pistons with an actuator system provided inside an enclosure of a source element, to generate a wave having a first frequency, and actuating the first and second pistons with a pressure mechanism attached to the enclosure, to control a pressure of a fluid inside the enclosure such that a pressure of the fluid is substantially equal to an ambient pressure of the enclosure. The enclosure has first and second openings and the first and second pistons are configured to close the first and second openings.. ... Cgg Services Sa

04/06/17 / #20170097442

Protective cover and related method

Covers and methods to protect outer surfaces of marine equipment are provided. The covers are manufactured to extend along at least one dimension. ... Cgg Services Sa

04/06/17 / #20170097434

Methods and data processing apparatus for cooperative de-noising of multi-sensor marine seismic data

Method and data processing apparatus are used to process seismic data, including pressure data and sensor-acquired acceleration or sensor-acquired velocity data as acquired simultaneously by multi-component sensors in streamers. Equivalent acceleration data is obtained from the pressure data and used as references for de-noising the sensor-acquired acceleration data.. ... Cgg Services Sa

04/06/17 / #20170097432

Device and method for constrained wave-field separation

Computing device, computer instructions and method for up-down separation of seismic data. The method includes receiving the seismic data, which includes hydrophone data and particle motion data; performing a first up-down separation, which is independent of a ghost model, using as input the hydrophone data and the particle motion data, to obtain first up-down separated data; performing a second up-down separation by using as input a combination of (i) the hydrophone data and/or the particle motion data and (ii) the first up-down separated data, wherein an output of the second up-down separation is second up-down separated data; and generating an image of the subsurface based on the second up-down separated data.. ... Cgg Services Sa

03/30/17 / #20170090056

Method and device for controlling source array geometry

Methods related to controlling a source array while performing a seismic survey to achieve an intended source signature. A current three dimensional arrangement of the individual seismic sources is compared with a target 3d arrangement. ... Cgg Services Sa

03/30/17 / #20170090055

Marine seismic survey pre-plot design

Method and system for generating a full acquisition path for a marine seismic acquisition system. The method includes receiving survey area information about a survey area to be seismically surveyed; selecting a radius (r) and a length (l) of a lace; selecting an overlap distance (ol) between first and second lanes; generating the full acquisition path by repeating the lace along a first lead line inside the first lane and along a second lead line inside the second lane and replicating the first and second lanes until the entire survey area is covered with laces; and sending the full acquisition path to a streamer vessel for performing the seismic survey.. ... Cgg Services Sa

03/23/17 / #20170082764

Source controller system for marine seismic source and method

A source controller distributed system for a multi-element marine source includes a master controller communicating via a cable with source controllers associated with source elements. The master controller generates commands for the source controllers. ... Cgg Services Sa

03/16/17 / #20170075016

Methods and systems for monitoring a subsurface formation with a land active streamer

The present disclosure includes a method for monitoring a subsurface formation including disposing an antenna in a horizontal wellbore, the antenna including a plurality of piezoelectric modules. A voltage signal is applied to at least one of the piezoelectric modules to cause the at least one piezoelectric modules to emit seismic energy into the subsurface formation. ... Cgg Services Sa

03/16/17 / #20170075011

Method and device for controlling source subarrays arrangement

The arrangement of air-gun subarrays is controlled by adjusting a geometric parameter, such as, an inline distance, an attack angle and/or a cross-line position for one or more subarrays. The adjustment is performed to achieve a target energy distribution for signals emitted by the air-gun subarrays.. ... Cgg Services Sa

03/16/17 / #20170075010

Method and device for marine seismic acquisition

Methods and systems for improving azimuth distribution in a seismic acquisition system are described. A survey acquisition system includes a plurality of streamers towed by a plurality of streamer vessels, including a first streamer vessel and a second streamer vessel and a plurality of sources towed by a plurality of source vessels. ... Cgg Services Sa

03/16/17 / #20170075009

Spectral analysis and processing of seismic data using orthogonal image gathers

A method for spectral analysis of seismic data obtains imaged seismic data and generates orthogonally shifted imaged seismic data gathers. The orthogonally shifted imaged seismic data gathers are processed to generate a spectrally processed imaged seismic data. ... Cgg Services Sa

03/09/17 / #20170068014

Systems and methods for a composite magnetic field sensor for airborne geophysical surveys

Systems and methods for a composite magnetic field sensor is disclosed. The electromagnetic survey system includes a first receiver configured to sense signals in a first spectrum based on sensing a magnetic field. ... Cgg Services Sa

03/09/17 / #20170068010

Subterranean formation monitoring using frequency domain weighted analysis

The disclosed method includes receiving resulting signals emanating from a subterranean formation, wherein the resulting signals are caused by signals emitted from seismic sources. The method further includes dividing the resulting signals into a plurality of sub-samples. ... Cgg Services Sa

03/09/17 / #20170068006

Systems and methods for wireless data acquisition in seismic monitoring systems

Systems and methods for wireless data acquisition in seismic monitoring systems are disclosed. The method includes obtaining a signal table for an emitted seismic signal, receiving seismic signal data from a receiver configured to transform seismic signals into seismic signal data, and storing the seismic signal data on a storage system. ... Cgg Services Sa

03/09/17 / #20170068005

Method and system for pneumatic control for vibrator source element

Method, source array and source element that generate seismic waves. The source element includes an enclosure having an opening covered by a piston; a local supply accumulator fluidly communicating with an interior of the enclosure, a pressure of the fluid inside the local supply accumulator being larger than a pressure of the fluid inside the enclosure; a local supply valve located between the local supply accumulator and the enclosure and configured to control a flow of the fluid from the local supply accumulator to the interior of the enclosure; and a controller configured to control the local supply valve such that the pressure inside the enclosure does not fall below a first preset value based upon an ambient pressure of the enclosure while seismic waves are generated.. ... Cgg Services Sa

02/23/17 / #20170052269

Combination of controlled and uncontrolled seismic data

The present disclosure includes a method for combining controlled and uncontrolled seismic data. The method includes accessing one or more controlled signals, each controlled signal associated with a respective receiver of a plurality of receivers. ... Cgg Services Sa

02/16/17 / #20170045638

Systems and methods for multiple bandwidth electromagnetic geophysical exploration

A system and method for electromagnetic geophysical exploration is provided. The system includes a first transmitter (210) configured to transmit a first waveform in a first spectrum and a first receiver (212) configured to sense signals in the first spectrum. ... Cgg Services Sa

02/02/17 / #20170031045

Method and apparatus for modeling and separation of primaries and multiples using multi-order green's function

Data is recorded by sensors while an underground formation is explored, e.g., using a seismic acquisition system that emits and receives waves. A model, which is indicative of primary waves contained in the received data, is derived using a multi-order green's function. ... Cgg Services Sa

02/02/17 / #20170031044

Method and apparatus for estimating source signature in shallow water

In order to use near-field measurements to obtain signature of a signal penetrating seafloor in a shallow water surveyed area, the water-bottom reflections' effect is removed. The removal is performed by obtaining first a far-field initial estimate from stacked primary pulses in the near-field measurements, and then estimating water-bottom reflection portions for different depths using differences between the near-field measurements and the far-field initial estimate. ... Cgg Services Sa

02/02/17 / #20170031041

Method for iterative inversion of data from non-encoded composite sources

Recorded seismic data are obtained at a plurality of receivers from a plurality of sources, and a set of sources from the plurality of sources is selected using spatial criteria based on a location of each source such that any two sources in the set of sources are separated by a predefined minimum distance of separation sufficient to reduce cross talk between sources. The set of sources is combined in a non-encoded manner into a composite source, and forward modeling for the composite source is performed to generate a synthetic seismic data set. ... Cgg Services Sa

01/26/17 / #20170023690

Method and device for removal of water bottom and/or geology from near-field hydrophone data

A method for removing ocean bottom and/or geology related contamination. The method includes receiving first measurements corresponding to first seismic sensors mounted on a first source array; receiving second measurements corresponding to second seismic sensors mounted away from the first source array; processing the second measurements to determine a contamination model related to the ocean bottom and geology; removing the contamination model from the first measurements to obtain cleaned data; and calculating a source signature of the first source array based on the cleaned data.. ... Cgg Services Sa

01/26/17 / #20170023689

Predicting mechanical and elastic rock properties of the subsurface

Mechanical and elastic rock properties of a subsurface are predicted using actual physical samples from the subsurface as an alternative to wireline data obtained from wells. Geological rock data are generated from a physical geological sample of the subsurface. ... Cgg Services Sa

01/19/17 / #20170017006

Node position correction in presence of time distortions

Seismic data recorded on an ocean bottom node (obn) is used to determine observed direct arrival times at the obn from a set of seismic source shots having a time span that is only a portion of an entire span time for a shot line. The observed direct arrival times for each shot in the set of seismic source shots are compared statistically with a plurality of predicted direct arrival times for each shot in the set of seismic source shots to derive a statistical measure of differences across all shots. ... Cgg Services Sa

01/19/17 / #20170017005

Method and system for simultaneous seismic data acquisition of multiple source lines

Systems and methods for reducing survey time while enhancing acquired seismic data quality are provided. Data corresponding to plural source lines are acquired simultaneously, using sources at cross-line distance at least equal to their illumination width, with at least one source being towed above a streamer spread.. ... Cgg Services Sa

01/19/17 / #20170016873

Fracability measurement method and system

A method for estimating a fracability index for a geological location includes determining a fabric metric and a mineralogical composition metric for a geological sample extracted from a geological location and estimating a fracability index for the geological location from the fabric metric and the mineralogical composition metric. The fabric metric may be a grain related measurement such as grain size or angularity, or a pore-space related measurement such as pore area, diameter, aspect ratio, and circumference, or statistics associated with such measurements. ... Cgg Services Sa

01/19/17 / #20170015395

Methods and underwater bases for using autonomous underwater vehicle for marine seismic surveys

An underwater base for handling plural underwater vehicles equipped with seismic sensors for recording seismic signals during a marine seismic survey. The underwater base including a storing part configured to store the plural underwater vehicles; an inlet part located above the storing part and configured to control access of the plural underwater vehicles to the storing part; a control part configured to acoustically guide the plural underwater vehicles to the inlet part; and a support part configured to support the control part, the storing part and the inlet part. ... Cgg Services Sa

01/12/17 / #20170010375

Device and method for wave-field reconstruction

Computing device, computer instructions and method for processing input seismic data d. The method includes a step of receiving the input seismic data d recorded in a first domain by seismic receivers that travel in water, the input seismic data d including up-going and down-going wave-fields; a step of generating a model p in a second domain to describe the input seismic data d; and a step of processing with a processor the model p to obtain an output seismic dataset indicative of the down-going wave-field and substantially free of the up-going wave-field.. ... Cgg Services Sa








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