Determination of water saturation in earth formations independen

Details Determination of water saturation in earth formations independen Determination of water saturation in earth formations independen

1982-01-20

1985-01-15

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

166252, G01V 312, G01V 330, E21G 4900

Patent

active

044940718

ABSTRACT:
A method for determining the water saturation of subsurface earth formations substantially independent of lithology utilizing electromagnetic energy propagation measurements. The subsurface formations are first logged to obtain base log measurements of the dielectric permittivity of the formations as derived from electromagnetic energy propagation time values. The formations are then injected with a sufficient amount of oil miscible solution containing a surface active agent to displace substantially all the residual fluids from the formations for a radial distance at least equal to the radial zone of investigation. The formations are then injected with a sufficient amount of water to render the zone of investigation substantially 100 percent water saturated. The formations are logged a second time to obtain measurements of the dielectric permittivity of the saturated formations. Combining the base log measurements with the subsequent log measurements to provide a log of the water saturation of the formations substantially independent of lithology.

REFERENCES:
patent: Re28963 (1976-09-01), Fertl et al.
patent: 3878890 (1975-04-01), Fertl
patent: 3944910 (1976-03-01), Rau
SPE Paper 9041--Advancements in Electromagnetic Propagation Logging by R. P. Wharton, Gary A. Hazen, Rama N. Rau and David L. Best, Schlumberger Well Services, May 14-16, 1980; pp. 1-5.
SPE Paper 6542--Electromagnetic Propagation . . . A New Dimension in Logging by T. J. Calvert, R. N. Rau and Larry E. Wells, Schlumberger Well Services, Apr. 13-15, 1977; pp. 3, 7-9.
Dielectric Logging by D. Oliver--Dresser Atlas, Dresser Industries, Inc., pp. 2-5.

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