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随着鄂尔多斯盆地北部上古生界碎屑岩油气藏的不断发现,其储层物性特征及其成因引起了人们的特别关注。本文以北部杭锦旗地区上古生界储层为研究对象,利用扫描电镜、偏光显微镜、孔隙度和渗透率测定仪器对该地区的薄片和岩样进行了观察和测定,在此基础上,从沉积和成岩作用两方面对该地区储层致密化的原因进行了探讨。紧邻物源的冲积扇-河流相沉积环境造成砂岩的成分成熟度和结构成熟度均较低,特殊的原始组分和结构特征是砂岩致密的潜在因素,而成岩作用则是砂岩致密的主要原因,其中尤以压实作用和胶结作用最为重要,另外,储层中煤系地层的存在也对致密储层的形成有一定的贡献作用。
With the continuous discovery of clastic oil and gas reservoirs in the Upper Paleozoic in the northern part of the Ordos Basin, the reservoir physical properties and their genesis have drawn special attention. In this paper, the Upper Paleozoic reservoirs in the Hangjinqi area in the north of China were studied. The thin sections and samples were observed and measured by scanning electron microscopy, polarizing microscope, porosity and permeability measuring instrument. Based on this, And diagenesis on the two aspects of the reasons for the densification of the reservoir were discussed. The alluvial fan adjacent to the provenance-fluvial facies sedimentary environment resulted in lower maturity and lower maturity of the sandstone. The special primary components and structural features are potential factors for sandstone densification, while diagenesis is the major reason for sandstone densification , Of which compaction and cementation are the most important. In addition, the presence of coal measures in reservoirs also contributes to the formation of tight reservoirs.