Method for determining subsurface electrical resistance using el

Details Method for determining subsurface electrical resistance using el Method for determining subsurface electrical resistance using el

1993-01-15

1996-01-23

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

324334, 324344, 324347, 367 14, G01V 1100, G01V 312, G01V 330, G01V 100

Patent

active

054867649

ABSTRACT:
A method and apparatus for estimating the earth's resistance (conductivity) as a function of depth using electroseismic prospecting (ESP) or inverse ESP techniques. Resistance is determined by the frequency-dependent attenuation of reflected EM signals which are produced by application of seismic signals to the earth. A seismic wave is generated by conventional means into the earth, and EM waves are generated back to the surface by different reflectors at different depth levels. This propagation attenuates the high frequencies preferentially. EM waves generated at lower depths are further attenuated relative to those waves generated at more shallow depths. The method and apparatus determines the difference in spectral content between the reflected signals from different horizons based on their relative attenuation and uses this difference as a direct measure of the conductivity between the horizons. Inverse ESP effects can also be used to generate EM waves into the earth and use reflected seismic waves to determine resistance as a function of depth.

REFERENCES:
patent: 2054067 (1936-09-01), Blau et al.
patent: 2148679 (1939-02-01), Blau et al.
patent: 2156259 (1939-05-01), Blau
patent: 2354659 (1944-08-01), Bazhaw et al.
patent: 2805727 (1957-09-01), Bazhaw
patent: 3384811 (1968-05-01), Ikrath et al.
patent: 3392327 (1968-08-01), Zimmerman, Jr.
patent: 3524129 (1970-08-01), Ikrath
patent: 3621380 (1971-11-01), Barlow, Jr.
patent: 3975694 (1976-08-01), Melamed et al.
patent: 4104611 (1978-08-01), Kalden
patent: 4507611 (1985-03-01), Helms
patent: 4601022 (1986-07-01), Muir
patent: 4612506 (1986-09-01), Varotsos et al.
patent: 4692905 (1987-09-01), Sobolev et al.
patent: 4774469 (1988-09-01), Sobolev et al.
patent: 4837582 (1989-06-01), Takahashi et al.
patent: 4904942 (1990-02-01), Thompson
patent: 4904943 (1990-02-01), Takahashi
patent: 4931739 (1990-06-01), MacLaren
patent: 5041792 (1991-08-01), Thompson
S. T. Martner and N. R. Sparks, "The Electroseismic Effect", Geophysics, vol. XXIV, No. 2 (Apr. 1959), pp. 297-308.
R. A. Broding, S. D. Buchanan and D. P. Hearn, "Field Experioments on the Electroseismic Effect", IEEE Transactions on Geoscience Electronics, Dec. 1963, pp. 23-31.
L. T. Long and W. K. Rivers, "Field Measurement of the Electroseismic Response", Geophysics, vol. 40, No. 2 (Apr. 1975), pp. 233-245.
Asch et al., "The Study of the Interaction of Seismic Waves and the Electrical Properties of Rocks", Preliminary Final Report to the National Science Foundation, Jan. 27, 1988, pp. 1-36.

Affiliated with

Also associated with

Rating

Method for determining subsurface electrical resistance using el does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for determining subsurface electrical resistance using el, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for determining subsurface electrical resistance using el will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1506926