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:   4                .        ,    ,                  .          -       .            .: , ,  , - ,  Abstract: A series of density log data were obtained from the standoff experiments made in the four physical modelboreholes of different densities, and the properties of spine and rib curves have been derived by the analysis of thegamma-gamma data. Particularly, the shape of gamma ray propagation path between source and detector, the geometricalproperty of spine and rib curves, the influence of borehole density and the detector combination on the properties ofthe curves, and the adequate detector combination for standoff compensation could be discussed. It was also confirmedthat spine and rib slopes can be expressed as proportional to source-to-detector distance ratio between far and neardetectors. The result of this experiment was also effectively applied for understanding the basic concept of spine andrib slopes. Keywords: spine, rib, detector combination, source to detector distance, density log

A Study on Spine and Rib Properties for Standoff Compensation, Density Log