Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1993-01-15
1996-04-02
Gregory, Bernarr E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324323, 324332, 324337, 324344, 324347, 367 14, 342 22, G01V 308, G01V 312
Patent
active
H00015245
ABSTRACT:
A method of seismic prospecting using electromagnetic grounded antennas to detect electromagnetic waves that are produced from acoustic waves in the earth's formation. Seismic waves reflected by a formation in the earth are converted into electromagnetic waves in the vicinity of the antenna according to the streaming potential theory. The antenna has two electrodes which detect the horizontal component of the electromagnetic waves, thus providing additional seismic information that is not readily available using standard geophones. Antennas are also not subject to coupling problems and thus provide more accurate information than traditional geophones. For example, using multicomponent detection, all three components of the seismic pressure gradient can be detected. In addition, using geophones and antennas directly provides a method of separating source and receiver-generated static corrections for more effective stacking of seismic data and allows computation of seismic signal velocity through the low-velocity layer.
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Gist Grant A.
Rice James A.
Thompson Arthur H.
Exxon Production Research Company
Gregory Bernarr E.
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