非线性有效孔隙度计算方法研究  

Nonlinear Algorithm on Calculating Effective Porosity

作　　者：袁晓宇[1] 张哨楠[2] 李映涛[1] 刘迪[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]西南石油大学资源与环境学院,四川成都610500

出　　处：《测井技术》2013年第2期173-176,共4页Well Logging Technology

基　　金：油气藏地质及开发工程国家重点实验室基金(编号:PLC201201)

摘　　要：基于Wyllie时间平均公式的测井其线性泥质校正方法计算地层有效孔隙度只考虑了泥质含量对孔隙度的影响,忽略了泥质分布形态的影响,计算结果误差大。根据斯伦贝谢公司的S型曲线图版表述的泥质含量与束缚水饱和度之间的关系,经推导得出泥质含量与束缚水孔隙度之间的非线性关系式,进而计算得到有效孔隙度。该方法在一定程度上可以消除泥质分布形态对孔隙度的影响。在四川盆地XC地区的应用表明,该方法的有效孔隙度计算结果与实测岩心孔隙度更加匹配,尤其在泥质含量小于25%及大于70%的地层,其计算结果较线性有效孔隙度更可靠。The linear shaly correction method to calculate formation effective porosity is mainly based on the Wyllie time average equation in well logging. This method only considers the effect of the clay content on porosity while ignoring the effect of the shale distributive form, which leads to a big error between the calculated and the measured core porosity. Based on the relationship between clay content and irreducible water saturation represented by the Schlumberger S-shaped curve chart, we derive the nonlinear relationship between clay content and bound water porosity, and thus calculate the effective porosity. This method can eliminate the effect of the shale distributive form on porosity. The application in XC area in Sichuan basin shows that the calculated results match with the measured core porosity better, especially in these strata whose clay content is less than 25% or greater than 70%, the results are more reliable than the linear effective porosity.

关 键 词：测井解释 有效孔隙度 非线性 泥质含量 泥质分布 束缚水饱和度 

分 类 号：P631.84[天文地球—地质矿产勘探]