Nuclear magnetic resonance pulse sequences for determining bound fluid volume
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United States of America Patent
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Feb 14, 1995
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N/A
app pub date -
Nov 27, 1991
filing date -
Nov 27, 1991
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Abstract
An NMR pulse sequence for use in a borehole logging tool includes a series of CPMG pulses according to: T.sub.r -90.degree..sub..+-.x -(t.sub.cp -180.degree..sub.y -t.sub.cp -echo.sub.j) where j is the index of CPMG echoes gathered, T.sub.r is wait time, t.sub.cp is the Carr-Purcell spacing. This pulse sequence is used to determine Bound Fluid Volume (BFV) which is subtracted from total porosity to yield Unbound Fluid Volume (UFV) of a formation surrounding the borehole. Measuring the BVF, the amount of rapidly relaxing fluid (less than 50 ms), is more efficient than measuring UFV (up to 2 secs), and is insensitive to motion of the logging tool.
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