NMR interpretation technique using error minimization with variable T2 cutoff
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United States of America Patent
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Jun 6, 2000
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N/A
app pub date -
Sep 16, 1997
filing date -
Sep 16, 1997
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Abstract
This invention provides improved geological formation evaluation, resulting in a more accurate prediction of the location of hydrocarbon. It also increases the yield at those sites. The disclosed method involves determination by a nuclear magnetic resonance tool of a downhole T2 distribution, determination of T2 cutoff valves at discrete points in the borehole, and deriving a variable T2 cutoff time by either linear or non-linear correlations. Derivation of these variable T2 cutoff times provides the likely location of high irreducible water saturation, even where large quantities of movable water reside nearby.
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