Abstract
An NMR pulse sequence for use in a borehole logging tool includes a series of CPMG pulses according to: T r - 90° ±x - (t cp - 180° y - t cp - echo j ) where j is the index of CPMG echoes gathered, T r is wait time, t 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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