川中南部嘉二段气藏储层特征及测井评价

川中南部三叠系嘉二段储层储集类型多，非均质性强，岩性组合与气水关系复杂，测井解释极其困难。文章在深入分析川中南部地区嘉二段储层岩性特征、储层空间类型、储层孔渗性特征的基础上，提出了复杂岩性的识别方法，总结了区域性假储层的测井特征，建立了相应的储层识别方法，提高了测井识别及划分储层的准确度；通过对嘉二段多口井的试油资料、测井资料分析，探讨了多种储层流体性质判别方法的适应性，在此基础上提出了适应本地区储层特征的流体性质判别方法--孔隙度-电阻率交会法。利用关键井的岩心分析数据来标定测井资料，建立了孔隙度、渗透率等参数的解释模型，并验证了其可靠性，提高了测井解释精度，为油气田的生产提供了可靠的依据。

THE GAS RESERVOIR FEATURES OF Tj2 IN THE NORTH PART OF MIDDLE SICHUAN AND LOG EVALUATION

It is very difficulty to make a log interpretation for the gas reservoir of Tj_2 in the north part of middle Sichuan owing to taking the features of multi-types, strong heterogeneity, complex lithology and gas-water relationship. On the basis of analyzing the lithologic features, reservoir space types, porosity and permeability features of the gas reservoir of Tj_2 in the north part of middle Sichuan, the method of recognizing complex lithology is put forward; the log response features of regional pseudo reservoir are summed up; and the discrimination way of the corresponding reservoir is set up; which can enhance the accuracies of log identification and reservoir discrimination. Through analyzing the data of production test and log of some wells of Tj_2, The method adaptability of identifying multi-type fluid property is discussed. And then, an identification method, porosity-resistivity cross plot, of adapting the reservoir fluid property is put forward. By using the core analysis data of key wells to standardize log data, the log interpretation model fitting for calculating the porosity, permeability parameters is set up, and its liability is tested.