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Applications Of The Proximity Log
Preliminary field applications indicate the Proximity log gives much more accurate porosities than do Microlaterologs where thick mud cakes occur. It investigates deeper than other "Rxo" devices therefore requires knowledge of ROS, z, and Rmf/Rz. On appropriate charts Proximity log points fall predominantly between lines having the equations: z = (1/F) and z = (1/F)1/1. 05 with an average line; z = (1/F)1/1. 41 tentatively indicating a relationship between z and formation factor. Z and Rmf/Rz plots for the 16" normal curve show a "separation" between lower P. L. and higher 16: points for flushed, permeable beds and "no separation" for slightly permeable beds. The latter have large z factors. Preliminary studies indicate a %ROS correction 10-15% higher than for Microlaterologs is required, but this ROS is "fictitious" due to partial cancellation of ROS and Rz effects. This was previously observed for some Microlaterologs. Field applications show no effect on one-inch mud cakes upon the Proximity log.
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