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NMR tools afford new logging choices

04/17/2000
By CRAIG MORITZ
Nuclear magnetic resonance (NMR) logging has matured during the 1990s and offers the petroleum industry a method for determining bypassed pay, hydrocarbon content, and formation permeability.These logs are no longer an experimental or specialty wireline technology but are key to openhole formation evaluation and have become part of the standard wireline suite for many companies. In some cases, companies have replaced neutron-density and other logs with NMR logs.As with any tool, data should be evaluated as part of the total formation evaluation program. For example, if no database for the formations being logged exists, it may be advisable to calibrate the NMR bound fluid and permeability...
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