Method and apparatus for measuring transient electromagnetic and

Details Method and apparatus for measuring transient electromagnetic and Method and apparatus for measuring transient electromagnetic and

1997-06-26

1999-09-21

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 328

Patent

active

059558849

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.

REFERENCES:
patent: 4481472 (1984-11-01), Gianzero
patent: 4724390 (1988-02-01), Rauscher et al.
patent: 5115198 (1992-05-01), Gianzero et al.

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