METHOD OF MARINE SEISMIC SURVEY AND DEVICE FOR IMPLEMENTATION THEREOF Russian patent published in 2020 - IPC G01V1/38 B63B21/66 

FIELD: physics.

SUBSTANCE: invention relates to geophysics and can be used to determine structure and properties of geologic section at bottom of water bodies. Disclosed is an apparatus for marine seismic exploration, which includes a ship, a seismic station, a low-frequency source control unit, a mid-frequency source control unit, high-frequency source control unit, multichannel receiving device made in form of near-surface seismic cable in housing and piezoceramic hydrophones, multichannel receiving device made in the form of a buried seismic cable in the housing and piezoceramic hydrophones, a pneumatic, electrospark and piezoceramic oscillation sources, as well as carrying cable, cables for data transmission, high-pressure hose, auxiliary cables. Device also contains at least one cooler towed behind the vessel on a bearing rope, to which three receiving-emitting units are attached at different depths, two of which contain a source and a seismic braid configured to be towed at various depths from the bottom. Each seismic streamer consists of a set of pressure receivers in the form of hydrophones with uniform pitch from the beginning of the seismic cable to the end, each seismic streamer having an end buoy. Also disclosed is a method of marine seismic exploration, which includes excitation of oscillations, registration of reflected waves, processing of data, according to invention excitation of oscillations is carried out using three different-frequency sources installed at different levels relative to surface of water, operating in a given sequence or simultaneously. Recording of reflected waves is carried out by three multichannel receiving devices separated in vertical space, two of which are installed at the level of one of signal emitting devices towed along profile by means of vessel. Multichannel receiving devices are made in the form of seismic braches - near-surface and buried ones. Then, the data received with near-surface and buried data are sent to the recording device on the vessel for mathematical processing. Processing of obtained data enables application of methods of wave field separation for merging data of near-surface and buried braids.

EFFECT: technical result is high resolution of seismic prospecting in water areas due to expansion of frequency band of received elastic oscillations towed at different levels of seismic cables, high signal-to-interference ratio for regular and irregular jamming by increasing the multiplicity by a common depth point method, high detail of observations while maintaining depth, enabling operation in bad weather without losing data quality.

2 cl, 6 dwg