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根据野外地质剖面、岩心和铸体薄片观察,结合阴极发光、X-射线衍射、扫描电镜等分析,认为鄂尔多斯盆地奥陶系岩溶古地貌自西向东依次发育岩溶高地、岩溶斜坡和岩溶盆地,为优质储层的形成奠定了基础。研究区内经历了同生期层间岩溶、表生期风化岩溶和埋藏期埋藏岩溶3类古岩溶,形成了大量原生孔隙和次生孔隙,为后期成岩作用的改造提供了条件。马五14储层主要发育泥粉晶白云岩、(含)硬石膏结核泥粉晶白云岩、含膏白云岩/膏质云岩、膏岩及岩溶角砾岩,主要发育溶蚀膏模孔、晶间孔、晶间溶孔与微裂缝4种储集空间,溶蚀膏模孔是最主要的储集空间。研究区优质储层发育主要受2个方面因素控制,其中:岩溶古地貌影响储层分布、物性差异、气水分布,是优质储层形成的基础;在岩溶改造后形成的孔隙系统基础上又经历了3期溶蚀作用,2种作用相互叠合是形成优质储层的关键。
According to the field geologic profile, core and cast thin slice observation, combined with the cathodoluminescence, X-ray diffraction and scanning electron microscopy, it is concluded that the Ordovician karst paleo-physiognomy of the Ordos Basin developed karst highlands, karst slopes and karst basins in succession from west to east, The formation of high-quality reservoirs laid the foundation. In the study area, three layers of karstification, intergranular karstification, epigenetic karstification in the epoch, and three types of karstification in the burial period were formed, and a large number of primary and secondary pores were formed, which provided the conditions for the later diagenetic transformation. Ma Wu 14 mainly develops muddy dolomite, (with) anhydrite nodule mud dolomite dolomite, gypsum dolomite / gypsum dolomite, gypsum rock and karst breccia, the main development of erosion paste mold hole, Intergranular pores, intergranular dissolved pores and microcracks four kinds of storage space, dissolution paste hole is the most important storage space. The development of high-quality reservoirs in the study area is mainly controlled by two factors. Among them, the ancient karst palaeoclons affect reservoir distribution, physical properties and gas and water distribution, which are the basis for the formation of high-quality reservoirs. On the basis of the pore system formed after the karst reformation After three stages of dissolution, the two kinds of actions overlap each other is the key to forming a good reservoir.