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Determining bound and unbound fluid volumes using nuclear magnetic resonance pulse sequences
Determining bound and unbound fluid volumes using nuclear magnetic resonance pulse sequences
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机译:使用核磁共振脉冲序列确定有界和无界流体的体积
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摘要
A borehole logging tool comprises a Nuclear Magnetic Resonance (NMR) tool and is pulsed according to a selected Carr Purcell-Meiboom Gill (CPMG) sequence. Because the recovery time between CPMG sequences is short, the sequence acts as a filter such that signals induced by rapidly relaxing nuclei of fluid bound in an earth formation are detected. In this manner, the NMR tool gives a direct indication bound fluid volume and fast logging speeds are achieved.
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