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苏里格气田南区盒8~上段储层总体为特低孔超低渗砂岩储层。成岩作用是导致这种低孔低渗的重要因素之一,研究区盒8~上段主要的成岩作用有机械压实作用、溶蚀作用、胶结作用和交代作用。埋深大、压实紧、原生孔少、溶蚀作用强是主要的特点。综合镜质体反射率、岩石热解、粘土矿物及自生矿物特征,判定该区盒8~上储层主要处于中成岩期B阶段,局部处于晚成岩期。
South of Sulige Gas Field, Box 8 ~ Upper reservoir is ultra-low porosity and ultra-low permeability sandstone reservoir. Diagenesis is one of the important factors leading to the low porosity and permeability. The main diagenesis in the upper section of the study area is mechanical compaction, dissolution, cementation and metasomatism. Buried deep, tight compaction, fewer primary holes, corrosion is the main feature of strong. Based on the vitrinite reflectance, pyrolytic rocks, clay minerals and authigenic minerals, it is determined that the reservoirs from the 8th to the 8th are mainly in the B stage of middle diagenetic stage and partly in the late diagenetic stage.