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鄂尔多斯盆地东南缘长3油层组为低孔、特低渗透储层,为明确其成岩储集相类型和优质储层的控制因素,根据铸体薄片、扫描电镜、电子探针、X衍射等资料分析,对其成岩作用特征和成岩储集相类型进行了系统研究。结果表明,鄂尔多斯盆地西南缘长3油层组成岩后生作用复杂多变,破坏性成岩作用主要为机械压实、压溶作用及各类自生矿物胶结作用,溶解作用和破裂作用是储层物性改善的主要途径;长3油层组发育4种类型的成岩储集相,其中浊沸石溶蚀次生—原生孔储集相是最有利的成岩储集相,其分布受沉积相带控制,发育在三角洲平原及前缘截削式分流河道中;浊沸石次生孔隙的发育和沉积砂体的分布特征及是优质储层形成的主控因素。
Chang 3 reservoir in the southeastern margin of Ordos Basin is a low-porosity and ultra-low permeability reservoir. In order to clarify the types of diagenetic reservoir facies and the control factors of high-quality reservoirs, according to the information of cast thin slices, SEM, X-ray diffraction and other data The diagenetic characteristics and types of diagenetic reservoir are systematically studied. The results show that the epoch-forming facies of Chang 3 reservoir in the southwestern margin of Ordos Basin are complex and changeable, and the destructive diagenesis is mainly mechanical compaction, pressure-dissolving and self-mineralization cementation. The dissolution and rupture are the property of the reservoir There are four types of diagenetic reservoir facies developed in the Chang 3 reservoir, in which the turbinate zeolite secondary-primary pore reservoir is the most favorable diagenetic reservoir and its distribution is controlled by sedimentary facies and developed in the delta plain And the frontal truncated distributary channel; the development of secondary pores of laumontite and the distribution of sedimentary sand bodies and the main controlling factors for the formation of high-quality reservoirs.