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Quadratic corrections for the Z-effect applied to the inversion of broadband gamma ray logs from uraniferous zones Normal access

Author: R. H. Duffin
Journal name: Geophysical Prospecting
Issue: Vol 30, No 6, December 1982 pp. 855 - 865
DOI: 10.1111/j.1365-2478.1982.tb01343.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 501.07Kb )

Summary:
Nonlinear correction parameters have been determined to correct broadband gamma ray logs for the effects of photoelectric absorption in zones of high-grade uranium mineralization. These corrections have been determined empirically by logging artificial test pits. The corrections are a function of grade of mineralization, hole casing thickness, hole medium, and probe energy thresholds. Comparisons between core assays from a high-grade mineralized zone and corrected log inversions recorded with both low-threshold and high-threshold filtered probes are made. The best correlations were obtained between assays and inversion solutions for the low-threshold probe. This reflects the superior counting statistics of this type of probe. Filtered probes reduce z-effect errors but do not eliminate them, and have poorer counting statistics than unfiltered probes.


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