Radiant energy – Coded record and readers; invisible radiant energy type
Patent
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.
Roscoe Bradley A.
Stoller Christian
Beyer James E.
Fields Carolyn E.
Garrana Henry N.
Schlumberger Technology Corporation
Wagret Frederic C.
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