Method and apparatus for measuring total nuclear magnetic resonance porosity
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United States of America Patent
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Nov 14, 2000
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N/A
app pub date -
Jun 12, 1997
filing date -
Apr 9, 1997
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Abstract
A method and apparatus for determining gas corrected porosity using nuclear magnetic resonance (NMR) and density measurements is disclosed. The total porosity (TCMR) or an earth formation is determined using an NMR tool. A log output is generated that indicates the density of the formation. The density porosity of the formation is determined from the log output. The difference between the TCMR-density porosity log accurately indicates the presence of gas. A gas corrected porosity, .phi., and gas saturation, S.sub.g, are determined based upon the density porosity and TCMR.
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