低孔低渗储层基于测井资料反演m值与饱和度计算方法研究

Research on Water Saturation Model by Variable m Value of Low Porosity and Low Permeability Sandstone Reservoir

低孔低渗储层具有低孔隙度、低渗透率非均质性强等特点,其岩电参数特征与常规储层存在显著的差异;因此储层含水饱和度的计算是测井评价的一个难题。对南海西部海域大量低孔低渗样品的岩电实验结果进行分析研究,建立了利用测井曲线反演地层胶结指数m值与含水饱和度的方法。实际计算结果表明,由算法反演得到的胶结指数m值与岩心岩电实验结果很接近,因此可证明利用算法计算得到低孔低渗储层含水饱和度是可靠的。

Low porosity and permeability reservoirs with low porosity and low permeability characteristics of heterogeneity,the rock electrical characteristics with conventional reservoir parameter exists significant difference;therefore calculating the reservoir water saturation is a problem of logging evaluation. Base on analyzing rock electricity experiment results of a large number of rock samples,established the inversion formation cementation exponent m value and resistivity response equations of water saturation using the logging curve. Actual calculation results show that the m values obtained in this paper by the inversion algorithm is very close with the rock electric experimental results,so to prove that the algorithm presented to calculate the low porosity low permeability reservoir water saturation is reliable.