Abstract：Clay bound water is one of the important indicators of reservoir logging evaluation. The theoretical formula reflecting the relationship between the clay bound water porosity and the cation exchange capacity (CEC) of clay is derived in light of the diffuse double layer theory, and then the clay bound water porosity is determined through the core cation exchange experiment. Depending on nuclear magnetic resonance (NMR) and cation exchange experiments,this paper analyzes the error of determining clay bound water porosity by a traditional method of utilizing the T2 cutoff of 3ms clay bound water and clarifies the variation rules between the clay bound water porosity calculated by T2 cutoff and different NMR cutoff. A model is established for the calculation of clay bound water porosity with variable T2 cutoff of clay bound water. Further, a new method for its calculation in NMR logging is developed, with the specific calculation steps given in the paper. The application results show that the method is more reasonable and more suitable for core analysis than the traditional 3ms NMR logging method,which is an effective means of clay bound water evaluation.
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LU Yunlong, CUI Yunjiang, ZHU Meng, ZHAO Shuzheng. A new method for calculating clay bound water in NMR logging. Oil Geophysical Prospecting, 2022, 57(3): 713-718.
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