Page 152 - Basic Well Log Analysis for Geologist
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LITHOLOGY LOGGING AND MAPPING TECHNIQUES
Figure §2. Example crossplot of formation resistivity (R,: in this case from deep induction) with sonic porosity (b,). As with
y ON P DP )
Fivure 51. the rock type clusters are developed by core or cuttings analvsis, but logging control is all that’s necessary once
the relationship Is defined.
This example comes from the Lower Permian Council Grove B-zone, Ochiltree County, Texas. After Asquith (1979).
Open circles represent wells with both core/cuttings analysis and log control. Solid black circles represent wells with only
log control.
(In this example, sonic porosity (d,) is based on a limestone matrix, where At,,, = 47.6 wsec/ft.)
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