Method and apparatus for logging a borehole employing dual...

Details Method and apparatus for logging a borehole employing dual... Method and apparatus for logging a borehole employing dual...

G - Physics

01

V

358/3

G01V 5/12 (2006.01) G01V 5/10 (2006.01)

Patent

CA 1250058

-1- ABSTRACT OF THE DISCLOSURE The disclosure relates to a method and appara- tus for logging a borehole. A sonde having a source of penetrating radiation and at least two longitudinally- spaced radiation detectors is passed within a bore- hole. Count rate data is produced by each of the detectors end is continuously compared to redeterined count rate relationship which may be obtained from detectors operating in reference standard boreholes. In accordance with this count rate data comparison, the suitability of either the "ratio" or "spine/rib" analytical method is determined and the appropriate technique is automatically applied to produce an indication of a logged parameter such as formation porosity, selectively compensated for a borehole environmental condition such as variations in borehole diameter.

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