Chapter 22: Quick-Look Interpretation, Crossplots, and Overlays
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Published:2012
"Quick-Look Interpretation, Crossplots, and Overlays", Openhole Log Analysis and Formation Evaluation, Richard M. Bateman
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The term “quick-look log analysis” refers to a number of techniques for plotting log data in a reasonably effortless and simple way that reveals either the formation content or the formation lithology. These methods are widely used by log analysts for wellsite evaluations. Their great appeal lies in their simplicity and subtlety. Most quick-look methods can be applied without any special equipment and produce acceptable results. Broadly speaking, there are three types of quick-look analysis:
In general, compatible overlays manage to eliminate some unknown quality by taking a ratio, while revealing some other quality that is of interest, for example, water saturation. Crossplots are indispensable for computer-based analysis but also offer a quick and convenient means of determining endpoints such as Rw. Calculator algorithms offer a quick and simple means to calculate items of interest such as porosity and water saturation. They are widely incorporated into computer-based log analysis routines.
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