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针对唐80井区储层吸水能力差、注水压力高等问题,应用岩石薄片、扫描电镜、X衍射、粒度分析、压汞测定等资料,对研究区三叠系延长组长6储层的岩石学特征、孔隙结构特征、物性特征、成岩作用、非均质性特征、储层敏感性等进行了分析。结果表明:研究区储层以细粒长石砂岩为主,孔隙类型主要有原生孔隙、次生孔隙及微裂隙;成岩作用以压实作用、压溶作用和胶结作用为主;储层非均质性较强,敏感性为强酸敏,弱水敏,弱盐敏,弱速敏;根据各储层参数特征,认为研究区储层整体上属于特低渗—超低渗储层。
Aiming at the poor reservoir water absorption capacity and high water injection pressure in Tang 80 well area, the petrology of Chang 6 reservoir of Triassic Yanchang Formation in Triassic Yanchang Formation was studied by using thin slices of rock, scanning electron microscopy, X-ray diffraction, particle size analysis and mercury intrusion porosimetry Characteristics, pore structure characteristics, physical characteristics, diagenesis, heterogeneity, reservoir sensitivity and so on. The results show that the reservoirs in the study area mainly consist of fine-grained feldspathic sandstones, and the types of pores mainly include primary pores, secondary pores and micro-fractures; diagenesis is dominated by compaction, pressure solution and cementation; According to the characteristics of various reservoir parameters, it is considered that the reservoirs in the study area belong to the ultra-low permeability and ultra-low permeability reservoirs as a whole.