Westerngeco L.l.p.

Westerneco L.l.c.

Leendert Combee

Nicolas Goujon

Martin N Howlid

Svein Arne Frivik

Robbert J De Kok

Kenneth E Welker

David Lee Alumbaugh

James P Brady

Andrea Zerilli

Aslaug H S Melbø

Nicolae Moldoveanu

Edward Nichols

Iain Michael Cooper

Julian Edward Kragh

Everhard Johan Muyzert

Simon Hastings Bittleston

Kamal Babour

Ugo Conti

Sudhir Pai

H Frank Morrison

Philip Heelan

Nestor Cuevas

Michael Malling

Aslaug Stroemmen Melboe

Kevin Eyl

Aslaug Strømmen Melbø

Olav Lien

Robert Ross

Edward Kotochigov

Phil Heelan

Tallak Tveide

A system includes an unmanned marine vessel having a hull; a multi-dimensional seismic sensor array coupled with the hull, wherein the multi-dimensional seismic sensor array is configured to acquire seismic survey data in multiple directions; wherein the unmanned marine vessel comprises a power source configured to drive and provide propulsion to the unmanned marine vessel; and an umbilical cord for coupling the multi-dimensional seismic sensor array with the hull of the unmanned marine vessel, wherein the umbilical provides electrical communication between the unmanned marine vessel and the multi-dimensional seismic sensor array.

Multi-dimensional seismic sensor array

Apparatus and methods for acquiring seismic data using a seabed seismic data cable positioned on a seabed are described, including correcting for the effect of one or more sensor non-linear motions, which improves accuracy of seismic data. One or multiple non-linear movements of the sensor may be corrected for. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Rotational motion compensated seismic sensors and methods of use in seismic data acquisition

An unmanned water vessel can include a body defining an internal volume and having a shape adapted to travel through water, with a front and a back; at least one directional device that is exposed to the flow of water past the vehicle when the vehicle travels in a forward direction, the directional device having a first position that provides an angle of attack through the water flow and a second position that provides a second angle of attack through the water flow; and a control system that provides commands to the at least one directional device in view of a starting point, an end point, and at least information about water flow expected to be encountered by the water vessel during travel.

Apparatus and method for control of seismic survey equipment

Systems and methods for carrying out seismic surveys and/or conducting permanent reservoir monitoring with autonomous or remote-controlled water vehicles, including surface and submersible vehicles, are described. Additional methods carried out by autonomous or remote-controlled water vehicles and associated with seismic surveys further described.

Marine seismic survey systems and methods using autonomously or remotely operated vehicles

To survey a subterranean structure, for acquiring an electromagnetic (EM) measurement signal across EM receivers having a target axial spacing, a group of more than two EM receivers in an interval defined by the target axial spacing along a sensor cable is provided. The spacing between successive ones of at least some EM receivers in the group is less than the target axial spacing. EM measurements are acquired using the EM receivers in the group.

Electromagnetic measurements using a group of two or more electromagnetic receivers

A method for selecting a signal arrival for determining an accurate position of seismic equipment includes the steps of transmitting a signal from a pinger; predicting a direct arrival and a reflected arrival of the signal at a receiver, wherein each arrival is the time between the transmission of the signal to reception of the signal; measuring arrivals of the signal at the receiver; selecting the measured signal arrival that is similar to the predicted direct arrival as a preliminary signal arrival; defining a confidence interval for the actual direct arrival of the signal based on the predicted direct arrival and the predicted reflected arrival; and finalizing the signal arrival, wherein the selected preliminary signal arrival is the finalized signal arrival if it is within the confidence interval.

Methods of range selection for positioning marine seismic equipment

To perform surveying of a subterranean structure, an electromagnetic (EM) source array has a plurality of electrodes. Different subsets of the electrodes are dynamically activated to provide corresponding EM radiation patterns to survey the subterranean structure.

Dynamically activating different subsets of a plurality of electrodes

Apparatus and methods for acquiring seismic data using a seabed seismic data cable positioned on a seabed are described, including correcting for the effect of one or more sensor non-linear motions, which improves accuracy of seismic data. One or multiple non-linear movements of the sensor may be corrected for. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

A method for communicating with a receiver during an electromagnetic survey. In one implementation, the method may include sending a survey signal to a subsurface region, wherein the survey signals is a first electromagnetic signal and sending a diagnostic signal to the receiver. The diagnostic signal is a second electromagnetic signal having a diagnostic message.

Communication system for survey source and receiver

A survey apparatus for surveying a subterranean structure includes an electromagnetic (EM) sensing element to measure an EM field received from the subterranean structure, and a sample collector activatable to collect a sample of soil.

Surveying a subterranean structure using electromagnetic measurements and microorganism content data

A sensor cable for surveying. The sensor cable has a housing, which includes one of more electrodes and a conductive gel surrounding the one or more electrodes. The conductive gel is configured to conduct electrical current to the one or more electrodes and keep the one or more electrodes moist. The housing may also have a membrane surrounding the conductive gel, wherein the membrane is configured to hold the conductive gel in contact with the one or more electrodes and permit electric current to flow between a surrounding medium and the conductive gel.

Sensor cable for electromagnetic surveying

To perform an electromagnetic (EM) surveying of a subterranean structure, a signal generator produces a signal having an analog continuous waveform without steps in the waveform. Producing the signal is in response to an indication specifying a characteristic of the signal. An antenna is responsive to the signal having the analog continuous waveform to emit an EM field to produce the EM surveying of the subterranean structure.

Signal generator for electromagnetic surveying that produces a signal having an analog continuous waveform

A system to perform a marine subterranean survey includes at least one vertical electromagnetic (EM) source and at least one EM receiver to measure a response of a subterranean structure that is responsive to EM signals produced by the vertical EM source. At least one tow cable is used to tow the EM source and EM receiver through a body of water.

Surveying using vertical electromagnetic sources that are towed along with survey receivers

A sensor cable for surveying. The sensor cable may comprise at least one pair of current sensor electrodes and an amplifier. The current sensor electrodes may be disposed along opposite sides of the sensor cable. The current sensor electrodes may be configured to detect current in an electromagnetic field transverse to an inline direction of the sensor cable. The amplifier may be configured to amplify the current in the electromagnetic field for detection by the electrode pair.

A multi-component field source for surveying subsea formations includes at least two electrodes having a direction of motion, wherein the at least two electrodes are configured to produce an electric dipole in an orientation that is not parallel to both the direction of motion of the electrodes and the seafloor. A method for logging subsea formations includes transmitting electromagnetic energy into the subsea formations with at least two electrodes having a direction of motion and configured to produce an electric dipole in an orientation that is not parallel to both the direction of motion of the electrodes and the seafloor; and receiving signals that comprise electromagnetic energy that has traversed the subsea formations.

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Oslo, Norway

Leendert Combee