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运用常规偏光显微镜、电镜扫描、阴极发光、常规物性、粒度分析、压汞分析等方法对鄂尔多斯三岔-桐川地区长8储层的成岩作用和成岩序列进行综合研究。认为储集岩主要以中一细粒岩屑长石砂岩为主,其次为长石岩屑砂岩。储集空间主要以粒间孔、长石溶孔、岩屑溶蚀孔、胶结物溶蚀孔、微孔隙为主,具有低孔低渗的储集特征。压实作用和胶结作用对砂岩储层具有一定的破坏性,溶蚀作用和裂缝则有效的改善了储层的孔隙结构;从而建立该地区的成岩作用演化序列,认为三岔-桐川地区长8储层砂岩处于晚成岩阶段A期,部分以进入晚成岩B期。
The diagenesis and diagenesis sequences of Chang 8 reservoir in Sancha - Tongchuan area of Ordos Basin were comprehensively studied by conventional polarized light microscopy, electron microscopy, cathodoluminescence, conventional physical properties, particle size analysis and mercury intrusion analysis. The authors believe that the reservoir rocks are mainly medium-fine grained feldspathic sandstone, followed by feldspar lithic sandstone. The reservoir space mainly consists of intergranular pores, feldspar dissolved pores, lithic dissolution pores, cement dissolution pores and micropores, and has low porosity and low permeability reservoir characteristics. Compaction and cementation play a certain destructive role in sandstone reservoirs. The dissolution and fractures effectively improve the pore structure of the reservoir. Thus, the evolution sequence of diagenesis in the area is established. Reservoir sandstones are in late-diagenetic stage A and partly into late-diagenetic B stage.