针对鄂尔多斯盆地东胜气田砂岩的成岩作用及成储效应认识不清的问题,通过岩心观察与描述,根据薄片观察、阴极发光、扫描电镜、X-衍射及物性分析等资料,深入研究东胜气田下石盒子组储层的岩石学特征、孔渗特征、储集空间类型及成岩作用特征,确定储层成岩演化阶段和演化序列,系统探讨成岩作用的成储效应。研究结果表明:鄂尔多斯盆地东胜气田下石盒子组储层砂岩主要处于中成岩A期,部分进入中成岩B期;砂岩成分成熟度中等而结构成熟度较低,次生溶孔为其主要的储集空间,为典型的低孔低渗储层;研究区砂岩成岩作用主要有机械压实作用、胶结作用、溶蚀作用,其中,机械压实作用、碳酸盐岩胶结和硅质胶结作用减小孔隙,是引起储层致密的重要原因,而溶蚀作用形成次生孔隙,有利于改善储层物性。研究梳理了东胜气田下石盒子组储层特征、成岩演化及成储关系,以期对研究区致密砂岩气的深入勘探提供一定的借鉴和指导。
In response to the poor understanding of the diagenesis and reservoir formation effect of sandstones in Dongsheng Gasfield, Ordos Basin, the lithological characteristics, pore-permeability characteristics, reservoir space types and diagenetic characteristics of the reservoirs in Dongsheng Gasfield were studied in depth through core observation and description on the basis of slice observation, cathode luminescence, scanning electron microscope, X-ray diffraction and physical characteristic analysis, and other materials, the diagenetic evolution stages and evolutionary sequence of reservoir were determined, and the reservoir formation effect was discussed systematically. The results of the study showed that the reservoir sandstones of the lower Shihezi Formation in Dongsheng Gasfield, Ordos Basin were mainly in the Stage A of mesozone rock, and partly in Stage B of mesozone rock, with medium compositional maturity and low textural maturity; the secondary vugular pore was the main storage space, and the reservoir was a typical low-porosity and low-permeability reservoir; the sandstone diagenesis in the study area mainly included mechanical compaction, cementation and dissolution, among which mechanical compaction, carbonate cementation and siliceous cementation reduced the porosity and were important causes of reservoir densification, while the secondary pores formed by dissolution was conducive to improving the physical properties of the reservoir. The characteristics, diagenetic evolution and reservoir formation relationship of lower Shihezi Formation, Dongsheng Gasfield were studied in order to provide some reference and guidance for further exploration of tight sandstone gas in the study area.
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