Method of marine electromagnetic survey using focusing...

Details Method of marine electromagnetic survey using focusing... Method of marine electromagnetic survey using focusing...

2006-04-19

2010-06-15

Whittington, Kenneth J (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S358000, C324S363000, C702S006000

Reexamination Certificate

active

07737699

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.

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patent: 6236211 (2001-05-01), Wynn
patent: RE39844 (2007-09-01), Srnka
patent: RE40321 (2008-05-01), Srnka
patent: 2236028 (2004-09-01), None
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