Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1989-12-13
1991-10-01
Fields, Carolyn E.
Radiant energy
Coded record and readers; invisible radiant energy type
250264, 250265, G01V 510
Patent
active
050536206
ABSTRACT:
Method and apparatus for identifying and determining the concentrations of subsurface formation elements next to a borehole, by detecting and counting the gamma rays resulting from the activation of Al atoms by neutrons emitted by a high energy source. The total count rates from Al are corrected for Si interference by (1) calculating the ratio of the count rates of gamma rays from Si activation to the count rates of the gamma rays resulting from the inelastic collisions of neutrons with Si atoms, thus providing a reference ratio independent of environmental parameters; (2) detecting and counting the gamma rays resulting from the Si inelastic collisions; (3) determining from the count rates of silicon inelastic gamma rays and from said ratio, the count rates of Si activation gamma rays; and (4) subtracting, from the total count rates of activation gamma rays, the count rates of Si activation gamma rays.
The method comprises also detecting and counting the gamma rays resulting from the capture of said neutrons by atoms of a plurality of elements.
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"The Aluminum Activation Log" by H. D. Sott and M. P. Smith, presented at SPWLA Fourteenth Annual Logging Symposium, Lafayette, La., May 6-9, 1973.
"Geochemical Logging with Spectrometry Tools" by R. Hertzog et al., presented at 62nd Annual Technical Conference and Exhibition of the SPE in Dallas, Texas Sep. 27-30, 1987.
McKeon Donald C.
Seeman Bronislaw
Dunn Drew A.
Fields Carolyn E.
Garrana Henry N.
Schlumberger Technology Corporation
Wagret Frederic C.
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