METHOD FOR SEISMIC SURVEY ON WATER BODIES AND DEVICE THEREFOR Russian patent published in 2016 - IPC G01V1/38 

FIELD: geophysics.

SUBSTANCE: invention relates to seismic survey and are intended to determine structure and properties of geologic section under bottom of water bodies. Method for marine seismic survey includes excitation of vibrations by a source and recording of reflected waves with multichannel receiving device mounted with inclination relative to water surface, displacing along profile oscillation source and a multichannel receiving device by means of ship, data processing. Multichannel receiving device is made in form of a seismic cable consisting of a set of receivers of pressure in form of hydrophones with pitch between them from beginning of seismic cable to its end. Excitation of vibrations is carried out with three sources operating simultaneously or in a given order: pneumatic source in form of an air gun, sparker and boomer. Airgun excites low-frequency oscillations in range of 50-250 Hz, towed at a depth of not more than 0.25 of predominant length of excited oscillations, at distance of 10-20 m from first channel of seismic cable. Sparker excites medium-frequency vibrations in range 200-2,000 Hz and is located between air gun and boomer. Boomer excites high-frequency oscillations in range of 500-5,000 Hz, towed at a depth of not more than 0.25 of predominant length of excited oscillations, on possible minimum distance from first channel of seismic cable. Received seismic oblique data are transmitted on a recording device on vessel for mathematical processing. Device for marine seismic survey includes vessel-pusher, a seismic station, multichannel receiver made in form of a seismic cable in housing, and a system of three series-arranged sources for exciting elastic vibrations in different frequency ranges: pneumatic source in form of an airgun, sparker and boomer.

EFFECT: technical result is increase of resolution of seismic survey on water bodies.

2 cl, 1 dwg