发明名称 |
Method and apparatus for measuring the resistivity of earth formations using anti-parallel active and passive focussing electrodes |
摘要 |
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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申请公布号 |
US5036283(A) |
申请公布日期 |
1991.07.30 |
申请号 |
US19900483039 |
申请日期 |
1990.02.20 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
TROUILLER, JEAN-CLAUDE;GOUNOT, MARIE-THERESE |
分类号 |
G01V3/20;G01V3/24 |
主分类号 |
G01V3/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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