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The AAPG/Datapages Combined Publications Database

Bulletin of South Texas Geological Society

Abstract


South Texas Geological Society Bulletin
Vol. 18 (1978), No. 9. (May), Pages 53-63

Computerized Magneto-Electric (ME) Exploration: With Case History: The Giddings Field, Lee County, Texas

S. J. Pirson

Abstract

The application of computer processing to Magneto-electric (ME) Exploration has revealed some unexpected relationships:

  1. The existence of electro-telluric (ET) currents associated with oil and gas fields is definitely proved. Such currents form a doughnut distribution, the hole of the doughnut funneling the ET currents downward.

  2. The ET current funnel is not a chimney of constant cross-section as previously conceived; actually, it has a variable cross-section with ET currents flare-out at both ends.

  3. Depths to hydrocarbon accumulations may be determined as the depths at which the flare-outs occur when performing successive line integrations with greater and greater depth of investigation. The accuracy of depth determination depends on the grid spacing used in digitizing the surface Previous HitmagneticNext Hit measurements.

  4. Previous HitMagneticTop surveys may also be used as structural tools by applying the potential theory to basement relief computations and by determining the degree of curvature of deformed rocks. The strata curvature is related to the fracture intensity of brittle rocks.

  5. The Giddings Field, Lee Co., Texas, which produces from the fractured Austin Chalk and Buda Lime is a perfect example of ME Exploration.


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