Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1980-08-13
1987-12-15
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324375, G01V 324
Patent
active
RE0325643
ABSTRACT:
Apparatus for investigating subsurface earth formations traversed by a borehole comprising a system of electrodes consisting of a central electrode A.sub.0 and four pairs of electrodes M.sub.1 -M'.sub.1, M.sub.2 -M'.sub.2, A.sub.1 -A'.sub.1, A.sub.2 -A'.sub.2 respectively short-circuited and aligned symmetrically on both sides of the electrode A.sub.0.
This apparatus comprises arrangements which, for a frequency .function..sub.2, establish a potential gradient between electrodes A.sub.1 -A'.sub.1 and A.sub.2 -A'.sub.2. A source of alternating current of frequency .function..sub.1 is connected between the electrodes A.sub.1 -A'.sub.1 and A.sub.2 -A'.sub.2 and a source of alternating current of frequency .function..sub.2 between a surface electrode B and electrodes A.sub.2 -A'.sub.2. The potential difference between electrodes M.sub.1 -M.sub.2 and M'.sub.1 -M'.sub.2 is maintained substantially at zero by circulating a current between electrodes A.sub.1 -A'.sub.1 and electrode A.sub.0.
Such an apparatus allows simultaneous measurement in a borehole of the electrical resistivities of the subsurface earth formations extending over relatively small and relatively large lateral distances from the wall of the borehole.
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Borst Stephen L.
Carroll David H.
Lee Peter Y.
Schlumberger Technology Corporation
Strecker Gerard R.
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