A seismic survey system is provided. The system can include a receiver array including a first streamer and a second streamer. The system can include a first plurality of receivers coupled with the first streamer and a second plurality of receivers coupled with the second streamer. The system can include a main source array including a first main source and a second main source. The system can include an accessory source array including a first accessory source and a second accessory source. The first accessory source can couple with the first main source and the second accessory source can couple with the second main source. The system can include a first lateral cable to couple with a first diverter and with the first main source. The system can include a second lateral cable to couple with a second diverter and with the second main source.

A seismic survey system is provided. The system can include a receiver array including a first streamer and a second streamer. The system can include a first plurality of receivers coupled with the first streamer and a second plurality of receivers coupled with the second streamer. The system can include a main source array including a first main source and a second main source. The system can include an accessory source array including a first accessory source and a second accessory source. The first accessory source can couple with the first main source and the second accessory source can couple with the second main source. The system can include a first lateral cable to couple with a first diverter and with the first main source. The system can include a second lateral cable to couple with a second diverter and with the second main source.

A method for enhanced dispersion analysis begins with obtaining a plurality of measured waveforms, for example from two or more receivers of an acoustic logging tool placed in a borehole. The measured waveforms are divided into common gathers, and waveforms of each common gather are enhanced. The enhancement begins by calculating a travel time curve for a selected target mode of the common gather waveforms. Using the travel time curve, waveforms of the selected target mode are aligned to have zero apparent slowness. The aligned waveforms are filtered to suppress non-target mode waves. The aligned waveforms are then enhanced, and used to generate an enhanced dispersion curve of the selected target mode.

One embodiment includes receiving seismic data from a plurality of seismic sensors located proximate to a build section of a wellbore that is drilled into a subsurface. The seismic data is recorded for a plurality of seismic waves, at different angles, sent from a plurality of seismic sources towards the plurality of seismic sensors. Locations of the plurality of seismic sources relative to locations of the plurality of seismic sensors are such that the plurality of seismic waves are essentially planar at the plurality of seismic sensors. The subsurface is essentially homogenous proximate to the build section. For at least a portion of the plurality of seismic waves, the embodiment includes determining a slowness vector for each seismic wave, and determining a phase velocity and a phase angle. The embodiment includes determining at least one anisotropic parameter value for the build section, determining a vertical velocity value, and using these.

Included are methods and apparatus for marine geophysical surveying. One embodiment of the presently-disclosed solution relates to a method for instantaneous roll compensation of vectorised motion data originating from a fixed-mount geophysical sensor during a marine seismic survey. A streamer is towed behind a survey vessel in a body of water. The streamer includes a plurality of geophysical sensors and a plurality of orientation sensor packages. Vectorised geophysical data is acquired using the plurality of geophysical sensors, while orientation data is acquired by the plurality of orientation sensor packages. The orientation data is used to determine an instantaneous roll angle of the streamer at different positions on the streamer. The vectorised geophysical data is adjusted to compensate for the instantaneous roll angle of the streamer at different positions on the streamer. Other embodiments and features are also disclosed.

Embodiments of systems and methods for inductively powering seismic sensor nodes are presented. An embodiment of an inductive battery includes a battery cell configured to store charge for use by an external device. The inductive battery may also include a first inductive element coupled to the battery cell, the first inductive element configured to receive current from the battery cell and emit a responsive magnetic field for powering an external device through inductance. In an embodiment the external device is a seismic sensor node.

Included are methods and apparatus for marine geophysical surveying. One embodiment of the presently-disclosed solution relates to a method for instantaneous roll compensation of vectorised motion data originating from a fixed-mount geophysical sensor during a marine seismic survey. A streamer is towed behind a survey vessel in a body of water. The streamer includes a plurality of geophysical sensors and a plurality of orientation sensor packages, and each orientation sensor package comprises a magnetometer. Vectorised geophysical data is acquired using the plurality of geophysical sensors, while orientation data is acquired by the plurality of orientation sensor packages. The orientation data is used to determine an instantaneous roll angle of the streamer at different positions on the streamer. The vectorised geophysical data is adjusted to compensate for the instantaneous roll angle of the streamer at different positions on the streamer. Other embodiments and features are also disclosed.

The present invention relates to a seismic sensor node and corresponding measuring device for point measurements in seismic surveys of geological subsurface formations, where the sensor node includes a sensor housing with at least one movement sensor, the sensor node comprising a plate structure being adapted to be positioned into the sea bed, the sensor housing having a predetermined outer shape and the plate structure being adapted to receive and essentially enclose the sensor housing for providing acoustic coupling between the plate structure and the sensor housing, and the plate structure having a rotational symmetric structure with a vertical axis. The plate structure comprises a number of radially oriented plates secured together and being adapted to penetrate the sea bed with minimal displacement of the sea bed materials.

A method includes receiving over a network from one or more seismic sensors a data set characterizing a seismic event generating a seismic wave. Based on the data set, a time of arrival and intensity of the seismic wave at a predetermined location is calculated. The predetermined location has one or more mitigation devices. Whether the intensity of the seismic wave exceeds a predetermined seismic intensity threshold is determined. If the intensity of the seismic wave exceeds the predetermined seismic intensity threshold, the one or more mitigation devices are activated.

A downhole local solid particles counting probe (1) for counting solid particles (101) in a fluid (100) present in a hydrocarbon well in production comprising: an elongated and flexible protective tube (2) defining an internal cavity (5) terminating by a membrane wall (3) defining a tip (4), the protective tube (2) and the membrane wall (3) isolating the internal cavity (5) from the fluid (100) of the hydrocarbon well, the protective tube (2) and membrane wall (3) are made of metal or metal alloy and have a thickness (ei) such as to resist to the downhole hydrocarbon well pressure; a passive acoustic sensor (6) mounted inside the internal cavity (5), the passive acoustic sensor (6) having a front side (7) mechanically coupled on the membrane wall (3) of the tip (4); a characteristic dimension of the passive acoustic sensor (6) is similar to solid particles (101) average characteristic dimension, ranging from 0.5 mm to 1.5 mm, and a characteristic dimension of the membrane wall (3) defining the tip (4) ranges from 1 mm to 2 mm; and the passive acoustic sensor (6) is arranged to detect acoustic waves (30) generated by solid particles (101) impacting the membrane wall (3) defining the tip (4) so as to resolve an individual impact from a single solid particle and to produce a signal representative of a count of solid particles.