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A Comparative Study of Density Compensation in Gamma-Gamma Log in PVC Casings between above and below Ground Water Tables  

Kim, Yeong-Hwa (Dept. of Geophysics, Kangeon National University)
Hwang, Byong-Chol (NIS Consultant)
Park, Sung-Geun (Dept. of Geophysics, Kangeon National University)
Kim, Jong-Man (Dept. of Geophysics, Kangeon National University)
Publication Information
The Journal of Engineering Geology / v.19, no.2, 2009 , pp. 217-225 More about this Journal
Abstract
A series of model borehole experiments and analyses for density compensation were performed to achieve the effective density correction of gamma-gamma log obtained from PVC cased boreholes. A follow-up survey was made for clarifying the variation property of detector responses depending on casing types, the presence of borehole fluid, and the degree of separation between probe and borehole wall. A special emphasis was placed on the comparison of gamma responses obtained from above and below ground water tables. Finally, we could quantify the detector responses as a function of separation between the probe and borehole wall, construct standoff compensation charts, and the limitations of the compensation have been discussed for the environments of both above and below ground water tables.
Keywords
PVC casing; gamma response; standoff compensation chart; above ground water table; below ground water table;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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