UNDERWATER SYSTEM FOR SEISMIC EXPLORATION AT SEA Russian patent published in 2021 - IPC G01V1/38 B63G8/39 

FIELD: underwater exploration.

SUBSTANCE: system of underwater, including subglacial seismic exploration, at sea, consisting of an accompanying vessel and one or two robotic underwater vehicles (hereinafter – UV), is proposed. On one of the UV, there is a broadband seismic vibrator, and on the second one, there are receiving sensors of electromagnetic and seismic fields connected to a two-channel seismic station, a correlator, a microcontroller and flash memory. To link the coordinates of the UV, a parametric method is used for receiving signals from a ground-based radio navigation system such as “Loran”, “Neman” or the radio station of the accompanying vessel. Parametric reception of radio navigation signals is carried out by “highlighting” the water surface with UV acoustic radiation, close in frequency ƒ_a to the signals of ground RNS ƒ_e, so that a low-frequency difference signal F=ƒ_e - ƒ_a is formed in the skin layer of the electromagnetic wave, transferring information about the coordinates to the receivers of the UV. The seismic-electric and seismic methods of search and exploration are implemented in the passive mode, based on the noise of the natural seismic and electromagnetic fields of the earth, as well as semi-active method with radiation from one of the UV broadband seismic radiation.

EFFECT: proposed system significantly simplifies the search complex, allows one to receive signals under water and under ice with a minimum level of noise, eliminates the towing of long seismic braids to geophysical vessels, ensures operation in difficult Arctic weather conditions, and the seismic-electric method due to the spatial distribution of the secondary electric field comparable to the size of the desired productive anomaly of hydrocarbons, does not require high-precision coordinate binding, which significantly simplifies the work.

6 cl, 3 dwg