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分析优质储层的分布规律及其控制因素,对于加快天然气的勘探开发进程具有十分重要的现实意义。通过岩心观察、铸体薄片鉴定、粒度分析、扫描电镜、毛管压力分析以及包裹体测温等分析测试手段,根据成岩作用和成岩相特征,探讨鄂尔多斯盆地苏里格气田东部优质储层的分布规律。研究表明,碎屑颗粒粒度、砂岩类型以及成岩作用的差异是影响储层物性的主要因素。研究区目的层可划分出9种成岩相带,主要以优质储层与非优质储层的组合形式出现。位于致密相之间的石英加大胶结混合孔隙相、自生高岭石胶结晶间孔相以及粘土杂基混合充填溶蚀相,是发育优质储层的良好成岩相带。微裂缝的发育以及溶解作用的发生,是形成优质储层的关键因素。
Analyzing the distribution rules and controlling factors of high-quality reservoirs has very important practical significance for accelerating the exploration and development of natural gas. According to diagenesis and characteristics of diagenetic facies, the distribution of high-quality reservoirs in the eastern Sulige gas field of Ordos Basin was discussed through core observation, identification of castings, particle size analysis, scanning electron microscopy, capillary pressure analysis and temperature measurement of inclusions . The results show that the difference of particle size, sandstone type and diagenesis is the main factor affecting reservoir physical properties. Nine diagenetic facies zones can be identified in the study area, mainly in the form of combination of high-quality reservoirs and non-high-quality reservoirs. The quartz between the dense facies increases the cemented mixed pore phase, the intergranular kaolinite crystal intergranular phase and the clay miscellaneous mixed filling eroded facies, which is a good diagenetic facies belt of high-quality reservoirs. The development of microcracks and the dissolution process are the key factors for the formation of high quality reservoirs.