Apparatus for geophysical exploration

Details Apparatus for geophysical exploration Apparatus for geophysical exploration

G - Physics

01

V

324/12

G01V 3/08 (2006.01) G01V 3/12 (2006.01)

Patent

CA 1165816

ABSTRACT OF THE DISCLOSURE: Two vector components of the EM field, e.g., Hy and Ex, are picked up by suitable probes. The resulting signals are filtered by narrow band pass filters around a center frequency and amplified by gain selectable amplifiers to an acceptable level for a pre-processing circuit which enables fast mathematical operations to be done. The pre- processing circuit uses an all pass quadrature (90°) phase shifter, four fast multipliers and four integrators under the control of a timing circuit. The output of the pre- processing circuit are converted to digital values to permit mathematical processing. Then, the ratio, the phase shift and the coefficient of coherence between the two vector components of the MT-EM field are calculated. The above operations can be repeated for various frequencies .omega.o. The coherence value gives an indication of the quality of the measurement. With a low coherence value, the measurement must be repeated because the noise is too high. A graph of the ratio and phase shift values of the EM field with respect to .omega.o enables a geophysicist to make an interpreta- tion of deep rock conductivities at various depths.

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