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{{publication
| image = Mth16Cover.png
| series = Methods in Exploration
| title = Basic Well Log Analysis, 2nd Edition
| chapter = Log Interpretation
| frompg = 115
| topg = 135
| author = G. Asquith and D. Krygowski
| link = http://archives.datapages.com/data/alt-browse/aapg-special-volumes/me16.htm
| pdf = http://archives.datapages.com/data/specpubs/method16/me16ch07/images/me16ch07.pdf
| store = http://http://store.aapg.org/detail.aspx?id=707
| isbn = 0891816674
}}
Determining the porosity and true resistivity of a zone is the first step in converting the raw log data into estimated quantities of oil, gas, and water in a formation.