Methods for determining formation dip and strike using high freq

Details Methods for determining formation dip and strike using high freq Methods for determining formation dip and strike using high freq

1990-03-23

1992-03-10

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 330

Patent

active

050952722

ABSTRACT:
A dipmeter has a coil forming a medium frequency field (e.g., five megahertz); the field interacts with the formation to form induced currents in the formations dependent on resistivity. The formation boundaries create a phase shift contrasting with the shift occurring in the formation so that a pair of closely spaced coils on a shoe locates relative transition of a formation boundary. The boundary is located by the several dipmeter arms.

REFERENCES:
patent: 3551797 (1970-12-01), Gouilloud et al.
patent: 4401947 (1983-08-01), Cox
patent: 4422043 (1983-12-01), Meador
patent: 4600887 (1986-07-01), Baldwin et al.
patent: 4739272 (1988-04-01), Griffin et al.
patent: 4780678 (1988-10-01), Kleinberg et al.
"The Oil-Based Mud Dipmeter Tool", by A. Dumont, M. Kubacsi, J-L Chardac SPWLA Twenty-Eighth Annual Logging Symposium, Jun. 29-Jul. 2, 1987.

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