Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1985-07-17
1987-04-28
Howell, Janice A.
Radiant energy
Coded record and readers; invisible radiant energy type
250262, 250256, 376160, G01V 510
Patent
active
046617019
ABSTRACT:
Capture gamma ray spectroscopy measurements of earth formations traversed by a borehole are corrected for the influence thereon of the geometry and constituents of the borehole, thereby affording more accurate measurements of the spectral contributions from the formation elements. A partition factor is determined for each separate homogeneous region in the borehole/formation measurement environment, i.e., the tool, the borehole fluid, the casing (if present), the cement annulus (if present), and the formation, and these factors are plugged into predetermined elemental yield relationships, for the elements for which capture spectral measurements are made, to determine the volumetric fractions of such elements (or minerals containing such elements) in the formation.
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Hannaher Constantine
Howell Janice A.
Schlumberger Technology Corporation
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