Method and apparatus for measuring total nuclear magnetic resona

Details Method and apparatus for measuring total nuclear magnetic resona Method and apparatus for measuring total nuclear magnetic resona

1997-06-12

2000-11-14

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

G01V 300

Patent

active

061474894

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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Hill, et al., "Bound Water in Shaly Sands--Its Relation to Q.sub.v and Other Formation Properties", 20 Log Analyst 3-19.

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