Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1995-02-01
1996-05-28
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250266, 2502697, G01V 510
Patent
active
055213782
ABSTRACT:
A method for determining the porosity of an underground formation includes the steps of irradiating the formation with neutrons, detecting and measuring gamma rays resulting from irradiation of the formation, discriminating between gamma rays from the formation and gamma rays from the tool, and using a measurement of the gamma rays from the tool to determine the formation porosity. A suitable logging tool includes a neutron source, a gamma ray detector, means for discriminating between gamma rays from the formation and gamma rays from the tool, and means for relating the gamma rays from the tool to the formation porosity.
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Hearst, J. R. et al., "A Comparison of Energy-Window and Spectral-Fitting Methods for the Estimation of Carbonate Content in Rocks Using Neutron-Induced Gamma Rays", The Log Analyst, (Nov.-Dec. 1993), pp. 11-19.
D. V. Ellis, "Pulsed Neutron Spectroscopy", Well Logging for Earth Scientists, Elsevier (1987), pp. 293-301.
Grau James A.
Roscoe Bradley A.
Stoller Christian
Fields Carolyn E.
Hyden Martin
Pojunas Leonard W.
Schlumberger Technology Corporation
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