Method and apparatus for detecting boundary stratum and adjustin

Details Method and apparatus for detecting boundary stratum and adjustin Method and apparatus for detecting boundary stratum and adjustin

1993-08-30

1996-02-27

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

175 45, G01V 330, G01V 320, E21B 4702

Patent

active

054951747

ABSTRACT:
Methods and apparatus for detecting the approach of a boundary stratum while drilling in a substantially horizontal subsurface zone using sensor tools having sensors with different depths of investigation. The two depths of investigation signals are used to reduce spurious signals. In some cases, dips or angles of the boundary strat with the borehole may be determined. In alternative embodiments, one or more electromagnetic energy transmitters are used with a single receiver pair to generate a characteristic signature of approaching boundary stratum.

REFERENCES:
patent: 4451789 (1984-05-01), Meador
patent: 4786874 (1980-11-01), Grosso et al.
patent: 5045795 (1991-09-01), Gianzero et al.
patent: 5278507 (1994-01-01), Bartel et al.

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