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含油气盆地碎屑岩次生优质储集层的发育,除了与广泛发育的方解石胶结相有关外,在中国西部还有一类与沸石族自生矿物胶结的成岩相有关,其中以溶蚀方沸石胶结相形成的次生优质储集层与油气聚集成藏又有十分密切的关联。经实例分析:与自生方沸石胶结有关的成岩相主要受控于扇(辫状河)三角洲前缘相带、火山岩物源和成岩早期的碱性环境;次生优质储集层的形成在时间上主要处于成岩中期A阶段,在空间上受控于邻近的烃源岩、圈闭和输导体的沟通。方沸石矿物在物理性质上具有抗压易溶(有机酸)作用,较其他常见的自生矿物(胶结物)相对优越,就方沸石易于溶蚀的特点而言是较为理想的自生矿物(胶结物)。其溶蚀对孔隙度的贡献率在50%~75%之间,发育几率占绝对优势。所以,在方沸石发育的相带中寻找以粒间溶蚀孔为主的优质储集层,具有可靠的操作性和现实性。
In addition to the widespread development of calcite cementation, the development of secondary high-quality clastic reservoirs in petroliferous basins is related to the diagenetic facies cemented with zeolite spontaneous minerals in western China, The formation of secondary high-quality reservoirs and oil and gas accumulation and accumulation are very closely related. The case analysis shows that diagenetic facies related to authigenic zeolite cementation are mainly controlled by fan delta (braided river) delta front facies, volcanic source and early alkaline environment of diagenesis. Formation of secondary high quality reservoirs at time Mainly in the mid-diagenetic stage A, it is spatially controlled by the neighboring source rocks, traps and conductors. Analcime minerals are physically resistant to pressure-dissolving (organic acids) and are relatively superior to other common authigenic minerals (cements) and are ideal for authigenic minerals (cements) in terms of their susceptibility to erosion . The contribution of dissolution to porosity is between 50% and 75%, and the probability of development accounts for the absolute advantage. Therefore, looking for the high-quality reservoirs with intergranular dissolution pores in the facies of the analcite developed with reliable operation and reality.