Method using a d.c. source for determining resistivity distribut

Details Method using a d.c. source for determining resistivity distribut Method using a d.c. source for determining resistivity distribut

1988-04-15

1989-05-30

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324350, G01V 304, G01V 308, G01V 338

Patent

active

048354732

ABSTRACT:
An electromagnetic survey method for geophysical exploration, in which the variations in the earth's magnetic field are measured in two, non-parallel directions at one point in the survey area. Simultaneously, the variations in the earth's electrical field parallel to the survey line are measured at a number of points along the survey line. These measured variations are transformed to the frequency domain, and then the horizontal component of the magnetic field orthogonal to the direction of the measured electrical field is calculated. The impedance at each measurement point on the survey line is calculated as a function of frequency, and weighted averages of the impedance for predetermined frequencies using a zero phase length weight function corresponding to a low pass filter applied to the electric field are used to calculate the subsurface conductivity distribution.

REFERENCES:
patent: 2314597 (1943-03-01), Phelan
patent: 2390270 (1945-12-01), Piety
patent: 2531088 (1950-11-01), Thompson
patent: 2677801 (1954-05-01), Cagniard
patent: 4041372 (1977-08-01), Miller et al.
patent: 4286218 (1981-08-01), Bloomquist et al.
patent: 4339720 (1982-07-01), Halverson
patent: 4449099 (1984-05-01), Hoehn
patent: 4757262 (1988-07-01), Bostick, Jr.

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