Method for determining oil and water saturation in earth formati

Details Method for determining oil and water saturation in earth formati Method for determining oil and water saturation in earth formati

1990-05-09

1991-10-08

Fields, Carolyn E.

Radiant energy

Coded record and readers; invisible radiant energy type

250264, 250265, 250266, G01V 500

Patent

active

050556762

ABSTRACT:
A method and an apparatus for determining the hydrocarbon saturation S.sub.o in an earth formation surrounding a borehole, and/or the hydrocarbon saturation C.sub.b in said borehole, comprising:
irradiating the formation with a source of neutrons of sufficient energy to interact with atoms of the formation and the borehole, according to inelastic neutron reactions; detecting the resulting gamma rays at a near detector and a far detector; expressing the measured carbon (C) and oxygen (O) yields respectively as a first and second linear function of S.sub.o, S.sub.w the water saturation in the formation, C.sub.b and/or C.sub.o water saturation in the borehole; combining the respective carbon and oxygen yields (C.sup.n, O.sup.n) for the near detector, and the respective carbon and oxygen yields (C.sup.f, O.sup.f) for the far detector so as to form the differences C.sup.n -O.sup.n and C.sup.f -O.sup.f ; and solving for the unknowns S.sub.o and C.sub.b.
Alternately, in case either S.sub.o or C.sub.b is known from another source, one can use a single detector.

REFERENCES:
patent: 3849646 (1974-11-01), McKinlay et al.
patent: 4380701 (1983-04-01), Smith, Jr. et al.

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