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. Unlikemany other logging texts, the logging tools aregrouped according to their primary Interpretation tar-get, rather than their underlying measurement potential (SP) and gamma ray logs arediscussed first, as their primary use is correlation andtheir primary interpretive target is gross lithology (thedistinction between reservoir and nonreservoir).

quently in hydrocarbon exploration are called open-hole logs. The name open hole is applied because these logs are recorded in the uncased portion of the wellbore. All the different types of logs and their curves discussed in this text are of this type. A geologist’s first exposure to log interpretation can be a frustrating experience. This ...

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