Patent ID: 8076942
Filing Date: 2011-12-13
Classification: G01V

Abstract:
1. A method for marine electrical survey of hydrocarbon deposits in a researched profile of sea-bottom, said method comprising the steps of: providing a generator of electric current, associated with a generator clock; providing a generator line, wherein said generator is capable of generating a predetermined electric current in the generator line, said electric current is generated in the form of alternative-sign pulses with a generator signal frequency associated with a predetermined duration and a predetermined on-off time ratio of said pulses, said generator line is capable of exciting an electric field; providing a tow means capable of towing the generator line; providing a plurality of sea-bottom stations capable of measuring signals of said electric field, each said sea-bottom station is associated with a station clock; synchronizing the generator clock and the station clocks of said plurality of sea-bottom stations; mounting said sea-bottom stations at predetermined points, including a first point and a last point, along a predetermined profile line extending through and beyond said researched profile; positioning said tow means at a predetermined distance from the first point beyond said researched profile; towing said generator line by the tow means along said predetermined profile line to a point located at said predetermined distance from the last point beyond said profile; switching said generator on and causing said generator line of exciting the electric field; measuring time series of the electric current signals of said generator line, and measuring time series of the signals of said electric field by the sea-bottom stations during both the on and off periods of said electric current pulses; recording signal values of the signals of said measured time series; for each said sea-bottom station forming: providing a step for joint inversion of data for each said sea-bottom station for the time-domain data arrays and for the space-domain data arrays; and determining both a bottom strata resistivity for a predetermined depth of said researched profile and polarization characteristics of said researched profile based on the results of said step for inversion of data.