Westerngeco L.l.p.

Reflection Marine Norge As

Schlumberger Technology Corporation

Westerngeco Seismic Holdings Limited

Kambiz Iranpour

Svein Arne Frivik

Einar Holst

Simon Barakat

Seth Ian Friedly

Kenneth E Welker

Robert Montgomery Laws

James Edward Martin

Daniel H Golparian

Halvor Sehested Groenaas

Qinglin Liu

Espen Gulbransen

Nicolas Goujon

Julian Edward Kragh

Johan Olof Anders Robertsson

Claudio Bagaini

Lars Borgen

Hans Paulson

Thomas Elboth

Ali Özbek

Erik Vigen

Guillaume Jean Daniel Tamboise

Daniel Ronnow

Pieter Leonard Vermeer

Daniel Golparian

Timothy James Dean

Staffan Kari Eriksson

Christer Hoerlin

Geir Holm

Ivar Andreas Valstad

Stefan Johansson

Erk Vigen

Håkon Aune

Arash Jafargandomi

Tore Andre Nilsen

Described herein is a method for acquiring data using a marine vibrator towed by a vessel, the method comprising: obtaining data comprising at least one nominal pre-plot position in a horizontal plane; monitoring a position of the marine vibrator in the and a speed of the vessel; determining an offset between the position of the marine vibrator and the nominal pre-plot position in the towing direction; based on the offset and the vessel speed, adjusting one or more survey parameters and driving the vibrator with a series of one or more sweeps so that a predetermined frequency in the sweep or a subsequent sweep is emitted when the position of the vibrator is within a maximum distance of the nominal pre-plot position.

System and method for acquiring marine seismic data using a vibrator

A method for correcting for distortions in a seismic acoustic wavefield produced by a seismic vibrator that is immersed in a fluid, the method comprising: applying a pilot signal to the vibrator such that an acoustic wavefield travels outwards from the interface between the vibrator outer surface and the fluid: using a sensor located within the fluid so as to be sensitive to a property of the wavefield in the fluid to monitor the property of the wavefield as a function of time: and using the measured property to determine a change in wet volume of a component of the vibrator as a function of time V(t) or derivatives of V(t), and using the determined wet volume V(t) or its derivatives to correct for distortions in the seismic data produced by the vibrator.

System and method for characterizing a seismic acoustic signal

A method can include receiving seismic data acquired by a sensor unit responsive to emission of seismic energy in a frequency sweep of a duration having a duration time; correlating the seismic data and individual portions of the frequency sweep that correspond to individual time windows to generate individual sets of correlated seismic data; for a common event, identifying a corresponding event time in each of the individual sets of correlated seismic data; and determining a clock drift time based at least in part on the event times.

Data-driven clock drift adjustment

An airborne vehicle includes a positioning system to acquire information relating to a position of the airborne vehicle, and a measurement system to transmit signals to and receive signals from survey sensors of a survey arrangement used to survey a target structure, the received signals indicating positions of the respective survey sensors.

Positioning survey sensors using an airborne vehicle

In some examples, a sensor node comprises a sensor to measure survey data of a target structure. The sensor node receives a wireless synchronization signal, and synchronizes an operation of the sensor node based on the wireless synchronization signal.

Electromagnetic wave pulse synchronization

Embodiments disclosed herein are directed towards systems and methods for electric current leakage detection in a land seismic system. Embodiments may include generating at least one test signal using a digital to analog converter 'DAC' circuitry, wherein the DAC circuitry includes an output operatively connected to earth ground. Embodiments may further include alternately grounding a positive path to an analog to digital converter 'ADC' circuitry during a first time window and a negative path to the analog to digital converter during a second time window while measuring an ADC signal. Embodiments may also include determining an average amplitude of the first time window and the second time window and determining a leakage resistance based upon, at least in part, the average amplitude of the first time window and the second time window.

System and method for electric current leakage detection in a land seismic system

A sensor device includes an elongated housing containing particle motion sensors spaced apart along a longitudinal axis of the elongated housing, where the elongated housing has a length that is greater than a width of the elongated housing. A second portion includes communication circuitry to communicate over a communication medium, the second portion coupled to the elongated housing and having a width that is greater than the width of the elongated housing.

Sensor device having elongated housing

Systems and methods for asynchronously acquiring seismic data are described, one system comprising one or more seismic sources, a plurality of sensor modules each comprising a seismic sensor, an A/D converter for generating digitized seismic data, a digital signal processor (DSP), and a sensor module clock; a seismic data recording station; and a seismic data transmission sub-system comprising a high precision clock, the sub-system allowing transmission of at least some of the digitized seismic data to the recording station, wherein each sensor module is configured to periodically receive from the sub-system an amount of the drift of its clock relative to the high precision clock. This abstract is provided to comply with rules requiring an abstract to ascertain the subject matter of the disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Systems and methods for seismic data acquisition employing asynchronous, decoupled data sampling and transmission

An embodiment of the invention includes combining pseudorandom sweeps with an independent, or nearly independent, survey acquisition technique. Targeted design of pseudorandom sweeps can direct the majority of cross-correlation noise to lie outside key time-lags of the record (i.e., windows of interest). Embodiments of the invention are described herein.

Sweep sequence determination for overlapping sweeps

Sensor

A technique includes generating one or more sweep sequences for one or more seismic vibrators for a seismic survey and evaluating a cost for the sequence(s). The technique includes perturbing the sequence(s) and continuing the evaluation and perturbing until the cost is within a limit or a maximum number of perturbations is reached.

Generating sweep sequences

A technique includes generating seismic sweep sequences. Each of the seismic sweep sequences has an associated sweep rate. The technique includes varying the sweep rates to reduce harmonic distortion present in a composite seismic measurement produced in response to the sweep sequences.

Harmonic attenuation using multiple sweep rates

A technique includes receiving seismic data acquired in a seismic survey. The technique includes determining a geophysical trend of trace amplitudes indicated by the seismic data based on non-linear regression and performing quality control analysis on the seismic data based on the determined trend.

Technique and apparatus for seismic data quality control using non-linear regression analysis

An embodiment according to one or more aspects of the present disclosure for conducting a marine survey includes a survey spread comprising a plurality of receivers and an energy source that is towed along a selected course while a signal is emitted from an energy source. A plurality of receivers receive data comprising a detection sampling frequency and a survey sampling frequency. The survey sampling frequency is monitored to detect a cetacean vocalization and to position the cetacean at least while conducting the seismic survey. Pursuant to the location of the cetacean actions can be taken to protect the cetacean and to minimize disruptions in conducting the seismic survey.

Cetacean protection system

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Oslo, Norway

Kambiz Iranpour