Method and apparatus for measuring transient electromagnetic and electrical energy components propagated in an earth formation
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United States of America Patent
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Sep 21, 1999
Issued Date -
N/A
app pub date -
Jun 26, 1997
filing date -
Aug 15, 1994
priority date (Note) -
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Abstract
A single well transient electromagnetic ('TEM') apparatus and method is disclosed. The invention includes a wireline logging tool adapted for disposition in a borehole drilled in earth formations that has mounted thereon an electromagnetic transmitter and electric field transmitter for applying electromagnetic energy to the formation that will maximize the radial depth of penetration of the energy into the formation. The logging tool further includes an electromagnetic receiver and electric field receiver for detecting the electric field and magnetic field components created in the formation by the TEM transmitter. The electromagnetic transmitter and receiver preferably comprise three-axis electromagnetic coils, and the electric field transmitter and receiver preferably comprise three-axis electric dipole antenna elements. The tool may employ an array of the TEM transmitters and TEM receivers spaced axially along the tool in the borehole.
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