Nuclear Magnetism Logging has been field tested under a wide variety of conditions using commercial equipment and in most types of formations encountered in California, Texas, and Oklahoma. These field results are generally excellent. The free Fluid Index shows the minimum producible fluid and the thermal relaxation curves show the minimum amount of hydrocarbon available. Concrete examples demonstrate how this new logging technique can assist in the location of fluid bearing zones and the evaluation of hydrocarbon bearing strata. The principles involved are adequately covered in earlier papers and pare not dealt with herein. Future papers will cover refinements allowing a precise determination of borderline cases, but this presentation emphasizes that a direct field interpretation gives accurate straight forward results. Based on the field tests to date, Nuclear Magnetism Logging is both conservative and fail-safe and therefore represents money saving factors to the oil operator.

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