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Pgs Geophysical As
Pgs Geophysical As_20131212

Pgs Geophysical As patents


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

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "P" | Pgs Geophysical As-related inventors


 new patent  Methods for controlling towed marine sensor array geometry

A method for towing a streamer array includes moving a vessel along a body of water. Streamers are towed by vessel. ... Pgs Geophysical As

 new patent  Distributed multi-sensor streamer

This disclosure is related to the field of streamers. In one embodiment, a streamer may include a group of particle motion sensors. ... Pgs Geophysical As

 new patent  Seismic data processing

A method for seismic data processing can include obtaining seismic data acquired based upon trigger times and not based upon positions of triggered source elements. The seismic data can include near-continuously recorded seismic data in split records. ... Pgs Geophysical As

Coded signals for marine vibrators

Embodiments may be directed to marine vibrators and associated methods that use appropriately selected composite code sequences. A method of seismic surveying may comprise operating a plurality of marine vibrators. ... Pgs Geophysical As

Method for adjusting attributes of marine seismic survey data

Techniques are disclosed relating to reducing noise in marine seismic survey data. A shot-by-shot depth migration of recorded marine seismic survey data that includes multiples wavefields indicative of surface reflections may be performed. ... Pgs Geophysical As

Matching combined sensitivities of arrays of hydrophones

A system can include a first array of hydrophones and a second array of hydrophones. Each of the hydrophones can include a first detector and a second detector. ... Pgs Geophysical As

Isolating a portion of electric potentials generated by a hydrophone indicative of particle motion or pressure

A first portion of electric potentials generated by a first detector and a second detector of a hydrophone can be isolated, wherein the first portion is indicative of particle motion. A second portion of the electric potentials generated by the first detector and the second detector of the hydrophone can be isolated, wherein the second portion is indicative of pressure.. ... Pgs Geophysical As

Noise models by selection of transform coefficients

A data set representing features of a geologic formation is formed from two or more signal acquisition data set representing independent aspects of the same wavefield. A wavelet transform is performed on the two or more signal acquisition data sets, and the data sets are further transformed to equalize signal portions of the data sets. ... Pgs Geophysical As

Interference attenuation of a residual portion of seismic data

The present disclosure is related to methods, systems, and machine-readable media for interference attenuation of a residual portion of seismic data, such as may be recorded in a marine seismic survey. Recorded seismic data can be separated into a portion attributed to a source and a residual portion. ... Pgs Geophysical As

Piezoelectric accelerometer

At least some of the example embodiments are methods including measuring motion of a body by deflecting a first cantilever portion of a sensing element, and deflecting a second cantilever portion of a sensing element, the second cantilever element of the sensing element disposed opposite the first cantilever element. A first voltage having a first polarity is created across electrical leads responsive to the deflecting of the cantilever portions opposite the direction of the first acceleration of the body. ... Pgs Geophysical As

Constraint of dithering of source actuations

A system for constraining a dither time can comprise a source and a controller coupled to the source. The controller can be configured to actuate the source in sequence, while the source is moving through a fluid volume at a bottom speed, with an actuation time interval between each actuation comprising a sum of a nominal time and a dither time for each actuation and constrain the dither time for each actuation such that a reduction of the actuation time interval relative to a directly precedent actuation time interval is at most a threshold dither time difference, wherein the threshold dither time difference corresponds to a maximum bottom speed.. ... Pgs Geophysical As

Marine vibrator source acceleration and pressure

Marine survey data resulting from a first signal comprising a signal representing a flat spectral far-field pressure generated by a marine vibrator source swept over a frequency range according to a time function of motion such that acceleration of the marine vibrator source is a flat function in a frequency domain can be used to improve full waveform inversion. For example, full waveform inversion can be performed using the marine survey data received from the first signal and from a second signal generated by an impulsive seismic source to estimate a physical property of a subsurface location.. ... Pgs Geophysical As

Systems and methods of a marine geophysical damper system

Marine geophysical damper system. At least some of the example embodiments are methods of manufacturing a geophysical data product including obtaining geophysical data by a sensor streamer; and recording the geophysical data on a tangible computer-readable medium. ... Pgs Geophysical As

Seismic noise mitigation system and method

A seismic noise mitigation method. The method comprises identifying a wavenumber of a component in a residual wavenumber spectrum having a largest norm based on a preconditioned residual wavenumber spectrum. ... Pgs Geophysical As

01/11/18 / #20180011217

Optical filter

A device. At least some example embodiments are a device including a filter element configured to receive optical energy from a first optical fiber. ... Pgs Geophysical As

01/04/18 / #20180003835

Molded snap-in plug and device and method for using same

A harness plug and methods of use. Example devices include an arcuate portion and a lateral portion disposed at an outer periphery of the arcuate portion. ... Pgs Geophysical As

01/04/18 / #20180003834

Pressure compensation for a marine vibrator

A marine vibrator assembly includes a vibrational source; a hose connectable between the vibrational source and a gas source; and a releasable coupling between the hose and the vibrational source. A method of operating a marine vibrator assembly includes deploying a vibrational source into a body of water at a first depth, wherein an internal pressure of the vibrational source balances an external pressure on the vibrational source at the first depth; supplying gas at a flow rate to an interior of the vibrational source from a gas source as the vibrational source moves from the first depth to a second depth, wherein the internal pressure of the vibrational source balances the external pressure on the vibrational source at the second depth; stopping the supplying the gas from the gas source.. ... Pgs Geophysical As

01/04/18 / #20180002526

Streamer filler material and process

This disclosure presents a streamer filler material that is a low density gel formed from a two-part, mix-curable polymer, and methods of making streamers using such materials. One embodiment of the filler material features a two-part silicone gel mixed with a paraffinic oil. ... Pgs Geophysical As

01/04/18 / #20180001977

Performing geophysical surveys using unmanned tow vessels

Techniques are disclosed relating to towing source elements and geophysical sensors through a body of water using one or more unmanned tow vessel. In some embodiments, a plurality of unmanned tow vessels are configured to tow one or more signal sources and/or one or more streamers. ... Pgs Geophysical As

12/28/17 / #20170371069

Fiber optic streamer monitoring

A method includes collecting spectral data from fiber bragg grating sensors distributed at locations along a fiber optic component positioned along a streamer; and analyzing the spectral data to produce measurements of bend of an axis of the streamer proximate the locations. A streamer monitoring system includes: a fiber optic component positioned along a streamer; a plurality of fiber bragg grating sensors distributed at locations along the fiber optic component; a light source optically coupled to the fiber optic component and configured to interrogate the fiber bragg grating sensors; a photodetector optically coupled to the fiber optic component and configured to collect spectral data from the interrogated fiber bragg grating sensors; and a spectral analyzer in communication with the photodetector and configured to analyze the spectral data to produce measurements of bend of an axis of the streamer proximate the locations along the fiber optic component.. ... Pgs Geophysical As

12/28/17 / #20170371056

Source towing arrangement

A system can include a source and a front float coupled to the source. The front float can include a winch configured to adjust a position of the source. ... Pgs Geophysical As

12/28/17 / #20170371054

Migrating a horizontal component of a wavefield

A horizontal component of marine seismic survey data from an ocean bottom seismic survey can be migrated using a primary wave velocity model. The horizontal component can comprise a shear converted wave. ... Pgs Geophysical As

12/28/17 / #20170371049

Streamer manufacturing

A method of manufacturing a streamer section. The method includes coupling together a plurality of prefabricated harness modules. ... Pgs Geophysical As

12/21/17 / #20170363412

Pressure insensitive interferometer

A device. The device includes a substrate a substrate, a first optical waveguide disposed on the substrate and a second optical waveguide disposed on the substrate. ... Pgs Geophysical As

11/30/17 / #20170343692

Marine streamer having variable stiffness

Disclosed are methods and systems for performing marine geophysical surveys that utilize a streamer having variable stiffness. An embodiment discloses a sensor streamer comprising: an outer surface; tension members within the outer surface extending along a length of the sensor streamer; spacers disposed within the outer surface along the length of the sensor streamer; a geophysical sensor disposed in an interior of one of the spacers; and an actuator assembly configured to apply tension to the tension members.. ... Pgs Geophysical As

11/16/17 / #20170329097

Clamp and bending strain relief apparatus and methods

Clamp and bending strain relief (bsr) system and method are disclosed. One example of a system can include a clamp coupled to a cable. ... Pgs Geophysical As

10/05/17 / #20170285199

Geophysical cable preparation for antifouling paint

Embodiments relate generally to marine geophysical surveying. More particularly, embodiments relate to a streamer-preparation apparatus that cleans a geophysical cable to prepare it for application of an antifouling paint. ... Pgs Geophysical As

09/28/17 / #20170276817

Deblended and deghosted seismic data

Deblending and deghosting seismic data may include processing blended seismic data acquired after actuation of a first seismic source located at a first depth and a second seismic source located at a second depth. The processing may comprise deblending and deghosting the blended seismic data based on a difference in ghost responses of the first seismic source and the second seismic source.. ... Pgs Geophysical As

09/21/17 / #20170269245

Methods and systems to evaluate noise content in seismic data

This disclosure is directed to methods and systems to evaluate noise contend of seismic data received during a marine survey. The seismic data includes pressure and particle motion data generated by collocated pressure and particle motion sensors of a seismic data acquisition system. ... Pgs Geophysical As

08/17/17 / #20170235017

Streamer cleaning apparatus and associated systems and methods

Embodiments relate to marine streamer cleaning. An embodiment provides a streamer cleaning apparatus comprising: a housing comprising an inlet configured to receive a streamer and an outlet configured to dispatch the streamer; and scraper lamellas coupled to the housing, wherein the scraper lamellas are arranged to form an opening to receive the streamer. ... Pgs Geophysical As

08/17/17 / #20170235004

Streamer equipment tension control

An apparatus for acquiring survey data including streamer equipment comprising a lead-in cable; and a geophysical streamer with a plurality of geophysical sensors distributed along the geophysical streamer, including a forward geophysical sensor; a depressor coupled to the streamer equipment in front of the forward geophysical sensor; a variable tension control device coupled at a back end of the geophysical streamer; and a plurality of tension control system sensors. A method for acquiring survey data including obtaining data from tension control system sensors of a geophysical streamer system; identifying an adjustment to be made to one or more tension control factors of the geophysical streamer system to reduce or control vibrational behavior of streamer equipment of the geophysical streamer system making the adjustment to the one or more tension control factors; and acquiring survey data with the geophysical streamer system.. ... Pgs Geophysical As

08/17/17 / #20170234998

Methods and systems to determine properties of a subterranean formation

The current disclosure is directed to methods and systems to determine properties of a subterranean formation located below a body of water. The methods and systems compute synthetic pressure and velocity vector wavefields that represent acoustic energy interactions within a model environment that comprises a model body of water located above a model subterranean formation. ... Pgs Geophysical As

08/10/17 / #20170227668

Joint estimation of electromagnetic earth responses and ambient noise

A method and system for estimation of electromagnetic earth responses in a marine electromagnetic survey. A method may comprise estimating initial values of the electromagnetic earth responses and ambient noise applicable to the marine electromagnetic survey; and processing electromagnetic data based on the initial values of the electromagnetic earth responses and the ambient noise to obtain a joint estimation of updated values of the electromagnetic earth responses and the ambient noise, wherein the electromagnetic data was acquired with one or more electromagnetic sensors, wherein the electromagnetic data contains measurements of an electromagnetic field.. ... Pgs Geophysical As

07/13/17 / #20170199292

System and method of marine geophysical surveys with distributed seismic sources

Marine geophysical surveys with distributed seismic sources. At least some of the example embodiments are methods including performing a marine geophysical survey by: towing a plurality of high-frequency sources spread along a width of an array of sensors, the high-frequency sources having a first source density with respect to the width; and towing a plurality of mid-frequency sources spread along the width, the mid-frequency sources have a second source density with respect to the width, the second source density lower than the first source density; and towing a low-frequency source along the width; activating the high-frequency, mid-frequency, and low-frequency sources.. ... Pgs Geophysical As

06/29/17 / #20170184749

Method and system of a controllable tail buoy

Controllable tail buoy. At least some of the illustrative embodiments are methods including: towing a sensor streamer and tail buoy through water, the sensor streamer defining a proximal end and a distal end with the tail buoy coupled to the distal end, and the towing with the sensor streamer and the tail buoy submerged; and during the towing controlling depth of the distal end of the sensor streamer at least in part by the tail buoy; and steering the distal end of the sensor streamer at least in part by the tail buoy.. ... Pgs Geophysical As

06/22/17 / #20170176637

Marine streamer handling

Techniques are disclosed relating to marine geophysical prospecting. According to some embodiments, a survey vessel may tow a streamer through a body of water. ... Pgs Geophysical As

06/22/17 / #20170176636

Combined seismic and electromagnetic survey configurations

A method and apparatus for marine surveying including towing an electromagnetic source having an electromagnetic cross-talk zone and an entanglement zone; towing a plurality of pieces of seismic equipment, wherein each piece of seismic equipment is towed outside of the electromagnetic cross-talk zone and the entanglement zone; actuating the electromagnetic source; and while actuating the electromagnetic source, acquiring seismic survey data with the plurality of pieces of seismic equipment.. . ... Pgs Geophysical As

06/22/17 / #20170176620

Individual actuation within a source subarray

Source element of a source subarray can be individually actuated according to an actuation sequence. The actuation sequence can be at least partially based on a relative position of each of the source elements within a particular geometry of the source subarray with respect to a previously actuated source element and a towing velocity of the source subarray.. ... Pgs Geophysical As

06/15/17 / #20170168182

Geophysical survey systems and related methods

Geophysical survey systems and methods. At least some of the example embodiments are systems including: a tow vessel with an onboard data acquisition system; a sensor streamer that defines a proximal end and a distal end, the sensor streamer extends behind the tow vessel, and the sensor streamer submerged in the body of water; a lead-in cable coupled on a first end to the tow vessel, and coupled on a second end to the sensor streamer; a lead vessel associated with the sensor streamer, the lead vessel floating at or near the surface of the body of water, and the lead vessel coupled to the sensor streamer by a tow cable; and a seismic source in the water behind the lead vessel, the seismic source coupled to the lead vessel by a source cable that extends from the lead vessel to the seismic source.. ... Pgs Geophysical As

06/15/17 / #20170168178

Velocity model update with an inversion gradient

The present disclosure is related to a velocity model update with a full waveform inversion gradient. At least one method can include updating a velocity model of a subsurface, which can include suppressing high wavenumber components of the velocity model provided by reflected energy with a decomposed full waveform inversion gradient. ... Pgs Geophysical As

06/15/17 / #20170168176

Low frequency marine acoustic vibrator

Embodiments relate to marine acoustic vibrators that incorporate one or more piston plates that act on the surrounding water to produce acoustic energy. An example marine acoustic vibratory may comprise: a containment housing; a piston plate; a fixture coupled to the containment housing; a spring element coupled to the piston plate and the fixture; and a driver coupled to the piston plate and the fixture and configured to move the piston plate back and forth.. ... Pgs Geophysical As

06/15/17 / #20170168175

Compliance chambers for marine vibrators

A marine vibrator may include a containment housing, a sound radiating surface, and a compliance chamber. The compliance chamber may include a compliance chamber housing, a non-linear linkage assembly, and a low pressure chamber. ... Pgs Geophysical As

06/08/17 / #20170160412

Systems and methods for wireless communication in a geophysical survey streamer

A disclosed survey method includes towing geophysical survey streamers in a body of water and using sensors within the streamer to collect measurements that are then conveyed along the streamer to a recording station using at least one wireless transmission link. In some implementations at least one sensor is coupled to a wireless transceiver in a streamer to transmit geophysical survey measurement data along the streamer to a wireless base station. ... Pgs Geophysical As

06/01/17 / #20170153342

Flexible printed circuits in marine geophysical streamers

Disclosed are flexible printed circuits incorporated into marine geophysical streamers. An embodiment discloses a streamer for geophysical surveying comprising: a jacket; geophysical sensors; and a flexible printed circuit assembly disposed inside the jacket and coupled to the geophysical sensors, wherein the flexible printed circuit assembly comprises sensor signal conductors that communicatively couple the flexible printed circuit assembly to two or more of the geophysical sensors.. ... Pgs Geophysical As

06/01/17 / #20170153341

Low-frequency magnetic reluctance marine seismic source

This disclosure is related to marine seismic sources, for example marine seismic sources known in the art as benders. Some embodiments of this disclosure use magnetic reluctance forces to produce seismic energy. ... Pgs Geophysical As

04/27/17 / #20170116357

Bipole source modeling

Disclosed are methods and systems for producing bipole source modeling with reduced computational loads. A method may comprise receiving first electromagnetic data and second electromagnetic data from a first shotpoint and a second of a marine electromagnetic survey, modelling a first electromagnetic field and second electromagnetic field for one or more dipole sources of a bipole source and combining a plurality of data points to provide an approximation of an electromagnetic field for the bipole source. ... Pgs Geophysical As

04/27/17 / #20170115419

Marine surveys conducted with multiple source arrays

Marine surveys carried out with multiple source arrays comprising three or more sources are discussed. Each source of a multiple source array is an array of source elements, such as air guns. ... Pgs Geophysical As

04/27/17 / #20170115417

Marine surveys conducted with multiple source arrays

Marine surveys carried out with multiple source arrays comprising three or more sources are discussed. Each source of a multiple source array is an array of source elements, such as air guns. ... Pgs Geophysical As

04/27/17 / #20170115416

Marine surveys conducted with multiple source arrays

Marine surveys carried out with multiple source arrays comprising three or more sources are discussed. Each source of a multiple source array is an array of source elements, such as air guns. ... Pgs Geophysical As

04/20/17 / #20170108619

Geophysical inversion using sparse modeling

Methods of geophysical modeling and inversion are disclosed. A sparse domain is defined for a geophysical model, over which a sparse model result is computed. ... Pgs Geophysical As

04/20/17 / #20170108618

Geophysical inversion using sparse modeling

Methods of geophysical modeling and inversion are disclosed. A sparse domain is defined for a geophysical model, over which a sparse model result is computed. ... Pgs Geophysical As

04/20/17 / #20170108610

Marine data acquisition node

Disclosed are systems and methods for marine geophysical surveying. An example system an electromagnetic source configured to emit an energy field into a body of water; a marine data acquisition node comprising: a base having a buoyancy such that the base is configured to float in a body of water; a geophysical sensor coupled to the base; a weight configured to anchor the marine data acquisition node to a water bottom; and a line connected between the weight and the base configured to prevent the base from floating to a surface of the body of water.. ... Pgs Geophysical As

04/20/17 / #20170108604

Denoising seismic data

Denoising seismic data can include extracting a first plurality of overlapping patches corresponding to a respective seismic data window selected from a plurality of seismic data windows, reshaping the first plurality of overlapping patches into patch vectors, and determining sparse approximations of the patch vectors based on a dictionary and a sparse coefficient vector. Denoising seismic data can also include reshaping the sparse approximations into a respective second plurality of overlapping patches, and constructing a denoised version of at least one of the plurality of seismic data windows using the respective second plurality overlapping patches.. ... Pgs Geophysical As

04/06/17 / #20170097433

Noise template adaptation

Techniques are disclosed relating to reducing noise in geophysical marine survey data. According to some embodiments, a complex-valued, directional, multi-resolution (cdm) transform may be applied to marine survey input data and a noise template. ... Pgs Geophysical As

03/23/17 / #20170082760

Estimation of direct arrival signals based on predicted direct arrival signals and measurements

Estimation of direct arrival signals based on predicted direct arrival signals and measurements can include obtaining notional source signatures for notional sources that correspond to source elements in a seismic source. A first predicted direct arrival signal at a first location and a second predicted direct arrival signal at a second location can be determined. ... Pgs Geophysical As

03/02/17 / #20170059741

Biofouling target removal

Certain aspects of the present disclosure generally relate to cleaning geophysical equipment in water. An exemplary method includes illuminating, with laser light, an obstruction on the geophysical equipment while the geophysical equipment is deployed in an operable configuration (e.g., towed by a survey vessel).. ... Pgs Geophysical As

03/02/17 / #20170059734

Direct resistivity determination

A resistivity profile can be generated directly from measured electromagnetic field data from a marine survey. A series of transformations can be applied to remove a conductivity dependency from a boundary value problem such that an inversion method may no longer be required to generate the resistivity profile.. ... Pgs Geophysical As

03/02/17 / #20170059732

Method and system of inducing vibrations onto a sensor streamer

Inducing vibrations onto a sensor streamer. At least some of the example embodiments are methods including: towing a sensor streamer through a body of water, the sensor streamer comprising a plurality of geophones spaced along the sensor streamer; inducing a vibration onto the sensor streamer at a predetermined location, the inducing as the sensor streamer is towed; measuring the vibration by a geophone at a distance from the predetermined location, the measuring creates a measured vibration; and creating, by a computer system, a model of noise propagation along the sensor streamer, the creating based on the measured vibration.. ... Pgs Geophysical As

03/02/17 / #20170059731

Method and system of suppressing data corresponding to noise using a model of noise propagation along a sensor streamer

Suppressing data corresponding to noise using a model of noise propagation along a sensor streamer. At least some of the example embodiments are methods including: reading a data set containing noise and seismic signals recorded by geophones disposed in a sensor streamer when the sensor streamer was within a body of water; determining locations of noise sources along the sensor streamer when the sensor streamer was within the body of water; and suppressing data of the data set corresponding to noise sources along the sensor streamer.. ... Pgs Geophysical As

03/02/17 / #20170059730

Wavefield interpolation and regularization in imaging of multiple reflection energy

Methods and systems of generating seismic images from primaries and multiples are described. Methods separate pressure data into up-going pressure data and down-going pressure data from pressure data and vertical velocity data. ... Pgs Geophysical As

03/02/17 / #20170059726

Analogous processing of modeled and measured marine survey data

Measured marine survey data can be processed analogously to modeled marine survey data analogously and a misfit can be calculated between the processed measured marine survey data and the processed modeled marine survey data. A model parameter in the modeled marine survey data can be updated based on the misfit. ... Pgs Geophysical As

03/02/17 / #20170059725

Apparatus with thermal stress relief mechanism for heat generating coil and associated methods

Embodiments related to marine acoustic vibrator for marine geophysical surveys. An embodiment may include an apparatus, wherein the apparatus may comprise: a coil element comprising a coil; a coil clamp constraining motion of the coil element in at least one direction; and a spring disposed in a load path of the coil clamp. ... Pgs Geophysical As

03/02/17 / #20170059502

Identification of degrading electrodes in a marine electromagnetic survey system

A system and method is provided for identifying degrading electrodes in a marine electromagnetic survey system. A system may comprise a sensor array operable for use in a marine electromagnetic survey system, wherein the sensor array comprises a plurality of electrodes. ... Pgs Geophysical As

02/23/17 / #20170052281

Marine geophysical equipment cleaner

Techniques are disclosed relating to an apparatus with scraping members for cleaning a geophysical equipment (e.g., a streamer) being towed behind a survey vessel. The apparatus may, in one embodiment, include a housing and a plurality of scraping members that are disposed at least partially outside of the housing. ... Pgs Geophysical As

02/16/17 / #20170045635

Automated lateral control of seismic streamers

In the field of marine geophysical surveying, systems and methods for controlling the spatial distribution or orientation of a geophysical sensor streamer or an array of geophysical sensor streamers towed behind a survey vessel are provided. Various techniques for changing the spatial distribution or orientation of such geophysical sensor streamers in response to changing conditions are provided. ... Pgs Geophysical As

02/09/17 / #20170038551

Staggered optical fiber splices

At least some illustrative embodiments are apparatus including a tube having a wall defining an interior volume, first and second optical fibers disposed within the interior volume and the first and second optical fibers joined at a first splice. Also included are third and fourth optical fibers disposed within the interior volume, the third and fourth optical fibers joined at a second splice. ... Pgs Geophysical As

02/09/17 / #20170038545

Vented optical tube

Vented optical tube. At least some illustrative embodiments are conduits comprising a tube having a wall defining an interior volume of the tube. ... Pgs Geophysical As

02/09/17 / #20170038533

Tube reattachment

Tube reattachment. At least some illustrative embodiments are including a method exposing a first optical fiber and a second optical fiber disposed within an interior volume of a first tube. ... Pgs Geophysical As

02/09/17 / #20170038488

Piezoelectric bender with additional constructive resonance

Embodiments related to a sound source that comprises a base plate configured to bend and generate acoustic energy; a spring coupled to the base plate; and a mass element coupled to the spring, wherein the sound source is operable to produce at least two resonance frequencies in the sound source.. . ... Pgs Geophysical As

01/26/17 / #20170023686

Prediction and subtraction of multiple diffractions

Prediction and subtraction of multiple diffractions may include transforming previously acquired seismic data from a time-space domain to a transformed domain using a dictionary of compressive basis functions and separating, within the transformed previously acquired seismic data, a first portion and a second portion of the transformed previously acquired seismic data. Prediction and subtraction of multiple diffractions may also include predicting a plurality of multiple diffractions based on the separated first and second portions and adaptively subtracting the predicted multiple diffractions from the previously acquired seismic data. ... Pgs Geophysical As

01/19/17 / #20170017012

Ultrasonic cleaning of marine geophysical equipment

Various methods and apparatuses for facilitating cleaning of submerged geophysical equipment using sound waves transmitted at ultrasonic frequencies are disclosed. In some embodiments, one or more transducers may be configured to transmit sound at one or more ultrasonic frequencies. ... Pgs Geophysical As

01/19/17 / #20170016931

Displacement sensor device and system

The present invention relates to a displacement sensor device and the system including the device, wherein the device comprises a first at least partially transparent plane surface with a first diffraction pattern and a second plane surface comprising a second reflecting diffraction pattern. The diffractive patterns being adapted to diffract light within a chosen range of wavelengths, the second surface being positioned below and parallel to the first surface constituting a pair wherein said first and second diffractive patterns being essentially equal, the device also comprising displacement means for allowing u movement in a direction parallel to said surfaces, the device thus providing a movement sensitive diffraction pattern.. ... Pgs Geophysical As

01/12/17 / #20170010376

Methods and systems for streamer anti-twist

Disclosed are methods and systems for enabling anti-twist functionality in marine geophysical streamers. An embodiment discloses a method comprising: towing a streamer behind a survey vessel in a body of water, wherein the streamer comprises rotation sensors and streamer rotation devices; receiving data from at least one rotation sensor indicative of streamer twist; and rotating a portion of the streamer with at least one streamer rotation device to reduce the streamer twist based, at least in part on the data.. ... Pgs Geophysical As

01/05/17 / #20170003162

Piezoelectric accelerometer

At least some of the example embodiments are methods including measuring motion of a body by deflecting a first cantilever portion of a sensing element, and deflecting a second cantilever portion of a sensing element, the second cantilever element of the sensing element disposed opposite the first cantilever element. A first voltage having a first polarity is created across electrical leads responsive to the deflecting of the cantilever portions opposite the direction of the first acceleration of the body. ... Pgs Geophysical As








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