Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
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.
Payton Christopher C.
Strack Kurt-M.
Tabarovsky Leonty A.
Snow Walter E.
Springs Darryl M.
Western Atlas International Inc.
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