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通过常规物性分析、铸体薄片观察、压汞实验、X射线衍射等多项测试方法,综合分析了安塞油田谭家营长2储层的储层特征和成岩作用特点。谭家营长2段砂岩为一套典型的低孔隙度、低渗透率储层,孔隙度平均为13.2%,渗透率平均为10.2×10-3μm2,砂岩类型主要为长石砂岩,孔隙类型主要为剩余粒间孔隙,孔隙结构以小型小孔喉和微型小孔喉为主,储层非均质性较强。成岩作用主要有机械压实、压溶、胶结、溶解作用等。强烈的机械压实、压溶作用是潭家营长2油层物性变差的主要因素之一,成岩作用后期大量薄膜状粘土矿物的生成,导致原生孔隙大量丧失,进一步降低了砂岩的储集性能。
The reservoir characteristics and diagenesis characteristics of Tanjiayingchang2 reservoir in Ansai Oilfield are comprehensively analyzed through a number of testing methods, such as conventional physical property analysis, observation of casting thin sheet, mercury intrusion test and X-ray diffraction. The second member of Tanjiayingchang sandstone is a set of typical low porosity and low permeability reservoirs with an average porosity of 13.2% and an average permeability of 10.2 × 10-3μm2. The sandstone type is mainly feldspar sandstone, and the pore types are mainly residual Intergranular pores and pore structures are mainly composed of small pore throats and small pore throats, with strong reservoir heterogeneity. Diagenesis mainly mechanical compaction, pressure solution, cementation, dissolution and so on. The strong mechanical compaction and pressure-dissolving are one of the main factors that affect the physical properties of reservoir Tanchang 2, and the formation of a large amount of film-like clay minerals later in diagenesis resulted in a large loss of primary pores and further reduced the reservoir performance of sandstone .