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通过岩心观察并综合利用普通薄片、铸体薄片、阴极发光、扫描电镜和压汞等资料,对克深气田巴什基奇克组致密砂岩储层的岩石学、物性及孔隙结构特征、成岩作用、成岩矿物、所处成岩阶段和成岩演化序列等特征进行了研究。结果表明:储层经历压实、胶结、溶蚀和破裂等成岩作用,现今正处于中成岩A期。根据成岩作用类型和强度、成岩矿物及其对储层物性的影响将储层划分为压实致密、碳酸盐胶结、伊/蒙混层充填、不稳定组分溶蚀和成岩微裂缝5种成岩相。选取声波时差、电阻率、自然伽马、密度和中子等测井曲线,通过岩心薄片资料刻度测井归纳了不同成岩相的测井响应特征,由此建立了各成岩相的测井识别准则。并对克深区块各井的测井资料进行了处理,得到了各单井成岩相剖面展布特征,结合试气资料表明,成岩微裂缝相常与构造裂缝伴生因而含气性最好,而在无裂缝的叠加作用时,不稳定组分溶蚀相含气性最好,压实致密、碳酸盐胶结和伊/蒙混层充填相则对应干层。通过成岩相的深入分析是进行致密砂岩气储层综合评价和有利发育区带预测的重要方法。
The lithology, physical properties, pore structure and diagenesis of tight sandstone reservoirs in Bashijiqike Formation, Ke Shen gas field are observed and analyzed by using core samples, cast thin films, cathodoluminescence, scanning electron microscopy and mercury intrusion. , Diagenetic minerals, diagenetic stage and diagenetic evolution sequence. The results show that the reservoirs underwent diagenesis such as compaction, cementation, dissolution and fracture, which are now in the middle diagenetic stage A. Based on diagenetic types and intensity, diagenetic minerals and their influence on reservoir physical properties, the reservoirs are divided into five types of diagenetic facies such as compaction and tightness, carbonate cementation, filling of Iraqi / mixed layer, dissolution of unstable components and microfractures of diagenesis . The logging curves of acoustic diagenesis, electrical resistivity, gamma ray, density and neutron are selected. The logging response characteristics of different diagenetic facies are summarized by core sheet data logging, and the logging identification criteria of diagenetic facies are established . The well log data of each well in the Ke-Shen Block are processed and the distribution characteristics of the diagenetic facies section of each single well are obtained. Combined with the test gas data, it is shown that the microfractures of diagenesis are often associated with the tectonic fractures, In the case of no-crack superposition, the unstable components have the best gas-bearing property, compacted and dense, and the carbonate layers and the Iraq / mixed layer correspond to the dry layer. In-depth analysis of diagenetic facies is an important method for comprehensive evaluation of sandstone gas reservoirs and prediction of favorable development zones.