Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1994-09-09
1995-11-28
Willis, Davis L.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250265, G01V 510
Patent
active
054710570
ABSTRACT:
A method for determining the elemental concentrations in an underground formation by irradiating the formation with neutrons, detecting the .gamma. ray spectrum arising from neutron capture by the formation and analyzing the spectrum to determine elemental concentrations. This method avoids the need for activation measurements or natural radiation measurements and which is made possible by modifying the detected yield of iron (Fe) in the spectrum to compensate for the absence of aluminum (Al) and for the absence of potassium (K) when not measured directly. Apparatus for performing this method can comprise a neutron source, such as a broad energy chemical source, e.g. AmBe, or a pulsed accelerator source, a .gamma. ray detector for detecting capture .gamma. rays and means for analyzing the spectra detected by the detector for determining the elemental concentrations in the formation. This apparatus does not require an activation source nor does it require natural radiation or activation detectors and analysis circuitry.
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Hanig Richard
Hyden Martin D.
Pojunas Leonard W.
Schlumberger Technology Corporation
Willis Davis L.
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