Patent Number: 7,737,699

Title: Method of marine electromagnetic survey using focusing electric current

Abstract: Two embodiments of marine geo-electric probe methods for hydrocarbon deposits survey comprise--excitation of electromagnetic field in a surveyed medium by transmitting two rectangular current pulses therethrough, the first--during forward traveling of a probe device along a profile and the second--during backward traveling thereof,--measuring instant values of the first and second electric potential differences during the time between the pulses, wherein, the equal-zero condition of the electric potential differences along the profile is ensured,--calculating three sets of normalized electrical parameters based on difference values,--solving an inverse problem via a differential equation for the dipole source voltage in an electrochemically polarizable medium using the parameters,--producing data according to said electrical parameters, and--determining conductivity of the medium, induced-polarization factor and decay time constant of the polarization potential difference. The first embodiment is deployed for circular survey profiles, the second is for linear profiles.

Inventors: Rykhlinski; Nikolaj Ivanovich (Moscow, RU), Davydycheva; Sofia Nikolaevna (Moscow, RU), Lisin; Anatoli Semenovich (Troitsk, RU)

Assignee: Valentin TSOY

International Classification: G01V 3/15 (20060101); G01V 1/40 (20060101); G01V 3/06 (20060101)

Expiration Date: 2022-06-15 0:00:00