Method and apparatus for measuring the resistivity of earth form

Details Method and apparatus for measuring the resistivity of earth form Method and apparatus for measuring the resistivity of earth form

1990-02-20

1991-07-30

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324374, G01V 320

Patent

active

050362836

ABSTRACT:
The invention relates to a logging method and apparatus for determining the electrical resistivity of an earth formation traversed by a borehole. The resistivity is determined using a measuring pad which has a central electrode operable to deliver a measuring current. The measuring current is focused radially by means of two focusing systems: an active focusing system which focuses the measuring current in a first direction; and a passive focusing system which focuses the measuring current in a second direction perpendicular to said first direction.

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Oberto Serra, Fundamentals of Well-Log Interpretation, 1. "The Acquisition of Logging Data", Elsevier, 1984, pp. 1-76.

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