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Basic Relationships of Well Log Interpretation

1 Basic Relationships of Well Log InterpretationINTRODUCTIONThis chapter provides a general introduction to welllogging principles and methods that will be usedthroughout the book. Succeeding chapters (2 through6) introduce the reader to specific log types. The textdiscusses how different log types measure variousproperties in the wellbore and surrounding formations,what factors affect these measurements, where on astandard log display a particular curve is recorded, andhow interpreted information is obtained from the logsusing both charts and mathematical formulas.

porosity logs (i.e., sonic, density, and neutron logs) are covered next, then the resistivity logs. Nuclear mag-netic-resonance logs, although they provide porosity (among other quantities of interest), are presented after resistivity logs. This is due in part to their recent arrival and to their relative absence in historical data archives.

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