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充分利用岩心、薄片和钻测井等资料,对四川盆地JQ区块须家河组须二段致密砂岩气储层的沉积微相、成岩相和裂缝相特征进行了研究.结果表明,须二段沉积以辫状河三角洲前缘为主,发育水下分流河道、河口坝和分流间湾等微相;根据成岩作用类型、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、碳酸盐岩胶结、伊蒙混层充填和不稳定组分溶蚀4种成岩相;裂缝相则以局部层段发育的近水平缝为主.通过三者的叠加与复合对储层岩石物理相进行分类命名,划分出了河口坝-不稳定组分溶蚀-近水平缝相等多种岩石物理相.然后按照岩石物理相对储层物性的建设与破坏作用对其进行聚类分析,归纳出了PF1～PF4四大类岩石物理相.通过建立每一类岩石物理相的孔隙度-渗透率关系表明,基于岩石物理相约束而建立的储层渗透率解释模型具有更高的精度.岩石物理相是揭示致密砂岩气储层成因机理并提高其物性参数测井解释精度的有效途径.
The characteristics of sedimentary microfacies, diagenetic facies and fractures of tight sandstone gas reservoirs in the second member of Xujiahe Formation in Xujiahe Formation of JQ block in Jichuan block in Sichuan Basin are studied by using the data of cores, thin slices and drilling logs. Based on the diagenesis type, intensity, diagenetic minerals and their influence on the reservoir physical properties, the sediments of the segment are mainly composed of the braided river delta front with the development of submarine distributary channel, estuary dam and shunt bay. Compaction and compacting, carbonate cementation, mixed layer of Yimeng mixed layer and unstable component eroded the four diagenetic facies, and the fracture facies is mainly horizontal seam developed in the local interval.According to the superposition and compounding of the three reservoirs The rock physics phase is classified and named, and a variety of petrophysical facies, such as estuarine dam-unstable component dissolution-nearly horizontal seam, is divided and then clustered and analyzed according to the construction and destruction of petrophysical relative reservoir properties The four major types of petrophysical facies, PF1-PF4, have been developed.According to the porosity-permeability relationship of each type of petrophysical facies, it is shown that the interpretation model of permeability based on petrophysical facies has higher accuracy. The physical facies is an effective way to reveal the genetic mechanism of tight sandstone gas reservoirs and improve the interpretation accuracy of physical parameter logging.