In this paper, the application of the c/o spectrum logging tool developed by the Geophysical Institute, Daqing Logging Company in Daqing Oilfield, is described. The expressions for interpretation of oil saturation in place by c/o logging which is suitable to the arenaceous and argillaceous section in Daqing area is proposed. Data analysis indicates that the average accuracy for determining oil saturation in place by c/o logging is 10.9%, and the degree of agreement of grade of flooding determined for an oil reservoir is 76.9%.

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