Chapter 24: Lithology/Mineralogy
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Published:2012
"Lithology/Mineralogy", Openhole Log Analysis and Formation Evaluation, Richard M. Bateman
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Logs can be used as indicators of lithology. The most useful logs for this purpose are:
With the exception of the photoelectric factor measurement, Pe, and the natural gamma ray spectral log, no single tool measurement will by itself give a direct indication of lithology. However, much useful information can be gathered by combining the measurements from more than one porosity tool. The most useful combinations are:
It is often possible to scale porosity logs in such a way that two curves, when overlaid, immediately give a visual indication of the rock type. These methods are to be encouraged. A very good picture of a geologic column may be gained simply by color-coding an appropriately scaled combination of porosity logs. In a mixed lithology, it is essential to identify the rock type to choose correct values for the parameters needed to perform other log analysis calculations for porosity and water saturation. Correct identification of lithology will also assist in well-to-well correlation tasks.
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