5 results about "Ocean bottom" patented technology

A method for designing a seismic survey including (a) selecting a seismic survey grid as a basis for a seismic survey design, (b) generating off-the-grid locations by imposing spatial / temporal constraints on on-the-grid locations of the seismic survey grid, (c) mapping the off-the-grid locations from a physical domain to a pre-selected domain by applying a multidimensional transform to the off-the-grid locations, (d) mapping the pre-selected domain to a rank-revealing domain using a pre-selected operator, (e) applying a pre-selected process to minimize a rank of the off-the-grid locations in the pre-selected domain, (f) updating the seismic survey design based on which of the off-the-grid locations has the minimum rank, (g) repeating steps (b)-(f) for a number of iterations until a pre-selected threshold is met indicating an optimal seismic survey design, and (h) acquiring seismic data using the optimal seismic survey design.

The disclosure relates to an autonomous underwater vehicle for marine seismic data acquisition, the autonomous underwater vehicle comprising a cavity for accommodating an ocean bottom node such that a coupling surface of the ocean bottom node is at least partially exposed for coupling the ocean bottom node to a sea floor. The disclosure further relates to a marine seismic data acquisition system comprising an autonomous underwater vehicle and an ocean bottom node provided in the cavity. The disclosure further relates to a marine seismic data acquisition method comprising installing an ocean bottom node in a cavity of an autonomous underwater vehicle; releasing the autonomous underwater vehicle to a sea floor; and recording marine seismic data while the ocean bottom node is coupled to the sea floor.

A method may include ocean bottom sensor (OBS) acquisition designed for complex earth model building and imaging with full waveform inversion (FWI) technology. Various combinations of OBS source and receiver patterns, as well as source design may be validated with FWI sensitivity kernel analysis technique. Usually, OBS design is done using conventional methods based on wavelength, frequency requirements, ray tracing and rules of thumps. The method of the disclosed embodiments utilizes OBS design and acquisition combined with FWI sensitivity kernel analysis.

A correlated sparse nodes and mini-streamers system for collecting seismic data includes plural nodes distributed on the ocean bottom, and a mini-streamer spread that includes plural mini-streamers. The plural nodes and the mini-streamer spread are configured to simultaneously collect seismic data from a surveyed subsurface, and wherein a length of the mini-streamers is equal to or less than three times an inline distance between adjacent nodes of the plural nodes.

The invention belongs to the technical field of ocean engineering, and discloses an ocean subsurface buoy system and a control method thereof.The ocean subsurface buoy system comprises a communication buoy and a subsurface buoy, the subsurface buoy is electrically connected with the communication buoy through a communication cable, and a buoy retracting and releasing device is arranged on the subsurface buoy and connected with the communication buoy through a connecting cable; the communication buoy is provided with a first position and a second position, the buoy winding and unwinding device is used for achieving switching of the communication buoy between the first position and the second position by winding and unwinding the connecting cable, the communication buoy is located on the ocean water surface when the communication buoy is located at the first position, and the communication buoy is located outside the ocean internal subsurface buoy when the communication buoy is located at the second position. According to the ocean subsurface buoy system, the subsurface buoy and the communication buoy are physically separated, the subsurface buoy is always kept at the underwater safe depth, and the micro communication buoy is released to the water surface for short-time communication only when needed and is recovered immediately after communication is finished, so that the contradiction between the concealment and the communication capability is solved, and the survivability and the task cycle of the system are improved.