METHOD AND DEVICE FOR MARINE ELECTRICAL EXPLORATION OF OIL AND GAS FIELDS Russian patent published in 2009 - IPC G01V3/06 G01V3/15 

FIELD: instrumentation.

SUBSTANCE: group of inventions refers to geophysics, in particular to equipment systems for geoelctric exploration by induced polarisation method and is intended for predicting hydrocarbon accumulations in transit shelf zone at depths up to 10 m. Essence: the system includes a set of sea-bed stations and vessel with generator and exciting field formation unit connected with submerged horizontal towed dipole with energising electrodes; non-radiative ballast device; equipment for reading and writing data from sea-bed stations, recording position and time of current pulses generation and sea-bed stations initialisation. Sea-bed stations are equipped with "braids" positioned along and across exiting line. Each of the "braids" contains at least 3 measuring electrodes located at distance of 50-500 metres from each other. Time series of the first and the second electric potential differences of electric field between electrodes are recorded both during passage of current and during pause between pulses. When interpreting, data on field both during current passage and during pause between pulses is used in wide space-time domain. Resistance of medium and its polarisation characteristics are determined.

EFFECT: providing higher-grade prediction of possible hydrocarbon material sources within studied zone at shallow depths.

3 cl, 6 dwg, 1 tbl