Transcription of Basic Relationships of Well Log Interpretation
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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. 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).
• electrical • nuclear • acoustic or sonic logs The names refer to the sources used to obtain the measurements. The different sources create records (logs), which contain one or more curves related to some property in the rock surrounding the wellbore (see Society of Professional Well Log Analysts, 1984).
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