New NMR approach evaluates tight gas sand reservoirs

A new approach for evaluating neutron magnetic resonance (NMR) logs can determine permeability in tight gas reservoirs. The bulk gas-magnetic resonance permeability (BGMRK) has the same value in oil-based (OBM) and water-based (WBM) muds because it depends on gas reentry to the flushed zone after a mud cake is formed and mud invasion stops.Analysis of tight gas sand reservoirs is difficult. Many tight formations are complex, producing from multiple layers with different permeabilities that natural fractures often enhance. Well-logging techniques, such as NMR as standalone logs or in combination with conventional openhole logs, provide new interpretation methods for obtaining the represent...

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