Method and apparatus for dielectric well logging of subsurface earth formations with a lumped constant antenna
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United States of America Patent
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-
Jul 7, 1987
Grant Date -
N/A
app pub date -
Aug 20, 1984
filing date -
Aug 20, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and apparatus for use in introducing electromagnetic energy into subsurface earth formations and acquiring measurements relating to propagation of such energy therethrough. A logging tool body includes a plurality of transmitter and receiver antenna assemblies positionable against the borehole wall. Construction of each antenna assembly includes a cavity-backed slot resonated by lumped elements, the slots being oriented generally with their elongate dimension transverse to the tool body. The transmitters and receivers are interconnected, respectively, to a downhole source of electromagnetic energy operating nominally at 200 MHz and to appropriate receiver circuitry. Formation dielectric constants are determined from phase differences and relative amplitude ratios of energy from the formation incident on the receiver antennas.
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