A seismic streamer includes an outer sheath that forms an interior region of the seismic streamer of which a portion is filled with a gel or liquid. The streamer also includes at least one stress member placed off-center in the interior region, and multiple sensors mounted proximate to a center of the interior region, where the sensors include a pressure sensor and a motion sensor. The streamer further includes multiple tilt sensors mounted along the interior region. A method of manufacturing a seismic streamer includes placing at least one stress member off-center along a first direction, mounting multiple spacers along the stress member, and affixing sensors to respective spacers, where the sensors include a pressure sensor and a motion sensor. The method further includes mounting tilt sensors along the first direction and affixing an outer sheath to the streamer that forms an interior region of the seismic streamer.

An underwater fiber optic cable includes an optical fiber, and a jacket surrounding the optical fiber. The jacket includes a polymer having a first density, and particles distributed throughout the polymer having a second density greater than the first density. The particles have a predetermined volume fraction to thereby provide the underwater cable with a predetermined buoyancy when underwater.

A seismic streamer in accordance to aspects of the disclosure includes an outer skin formed in a longitudinally extending tubular shape, an inner surface of the outer skin defining an internal volume, a strength member that extends through the internal volume in a direction parallel to that of the longitudinally extending tubular shape, a filler material disposed in the internal volume and a sensor housing located in the internal volume and internally disposing a seismic sensor.

Embodiments described herein provide an EM source cable assembly with a buoyant member having first and second ends, and a longitudinal axis connecting the first end to the second end, and a plurality of indentations disposed along a surface of the buoyant member between the first end and the second end, wherein the indentations are operable to receive corresponding cables. The indentations extend along the longitudinal axis, and may be arranged helically about the longitudinal axis. The buoyant member may have a low density core material and a dense outer material, each of which may be a polymeric material. The low density material may be a foam, and the buoyant member may be formed by coextruding the low density material and the dense outer material.

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. The obtaining may include: towing a sensor streamer and a dilt buoy, the dilt buoy coupled to a proximal end of the sensor streamer by a line, the sensor streamer is submerged in a body of water and the dilt buoy is disposed at the surface the body of water; and during the towing measuring movement of the dilt buoy caused by surface wave action; and selectively damping relative movement between the dilt buoy and the sensor streamer, the relative movement caused by the surface wave action, and the selectively damping by a damper associated with the line.

Method for obtaining zero offset or near zero offset data in a marine seismic streamer survey. An acoustic transmitter (41) is attached to one of the buoys (14 or 16) that provide flotation to each streamer (12) and tow umbilical (13). The acoustic transmitters, or single transmitter in the case of a 2-D survey, may be fired (71-73) before each shot from the survey air guns. The response to the acoustic transmitters recorded by the near sensors in each streamer, or by a water break sensor if provided, will be a near-zero to zero-offset record of the shallow subsurface below the water bottom.

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. The plurality of unmanned tow vessels may, in some embodiments, traverse various sail paths along a surface of a body of water in order to acquire geophysical data relating to formations disposed below the bottom of the body of water.

Disclosed embodiments provide techniques for automated passive acoustic monitoring with machine learning. An acoustic sensor is accessed. The acoustic sensor includes an embedded acoustic controller which hosts a machine learning model. The acoustic sensor is coupled to one or more hydrophones. The acoustic sensor is deployed in a body of water and is submerged. The acoustic sensor can enter a sleep mode. The hydrophones receive an underwater audio signal. The audio signal can be associated with an acoustic pressure. The acoustic sensor can be woken from sleep when the acoustic pressure is above a pressure threshold. The machine learning model classifies a predicted source of the underwater audio signal. The classifying can be based on filtering the underwater audio signal for a first frequency band associated with a source of interest. The predicted source is reported to a user using a communications device.

A marine seismic acquisition system includes a frame that includes a central longitudinal axis and members that define orthogonal planes that intersect along the central longitudinal axis; a data interface operatively coupled to the frame; hydrophones operatively coupled to the frame; a buoyancy engine operatively coupled to the frame where the buoyancy engine includes at least one mechanism that controls buoyancy of at least the frame, the hydrophones and the buoyancy engine; and at least one inertial motion sensor operatively coupled to the frame that generates frame orientation data, where the hydrophones, the buoyancy engine and the at least one inertial motion sensor are operatively coupled to the data interface.

The methods and devices described herein provide a sensor array positioning system that may allow a user to program a series of sensor array locations, depths and orientations into a control center, which therein commands two or more unmanned surface or submarine vehicles which positions one or more sensor arrays. The devices consist of at least two unmanned vehicles, two or more tow cables, a flexible sensor array comprising one or more sensors, and one or more buoyancy engines. The unmanned vehicles may consist of a master vehicle and one or more slave vehicles, wherein the master vehicle commands the one or more slave vehicles.