Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1995-02-22
1996-07-16
Porta, David P.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250264, 2502695, 364422, 395929, G01V 510
Patent
active
055369383
ABSTRACT:
A borehole logging tool having a pair of spaced-apart detectors records intensity signals representing the die-away of nuclear radiation in a subsurface formation. Weighted moments of the intensity signals as well as of a model are produced. Corresponding weighted intensity and model moments are equated and simultaneously solved to obtain values for a borehole decay constant, a formation decay constant, and a formation-to-borehole amplitude ratio for each of the pair of detectors. From these values a trained neural network produces intrinsic values of a formation macroscopic thermal neutron absorption cross section, a formation porosity, and a borehole fluid cross section. A log is generated of these intrinsic values versus depth as the logging tool traverses the borehole.
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Allen L. Scott
Mills William R.
Bleeker Ronald A.
Bruce David Vernon
Keen Malcolm D.
Mobil Oil Corporation
Porta David P.
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