The pore evolution process of tight sandstone affects the enrichment and distribution of natural gas,which is the focus of the development of the deployed tight gas storage sand body.In Liandaowan area Upper Paleozoic He 8 to Shan 2 tihgt gas storage sandstone as the research object,through the gas pore permeability,high pressure mercury data with drilling core sheet and scanning electron microscope micro-scopic observation,this study analyzes the physical characteristics,qualitative and quantitative characteriza-tion of the pore,discusses the key factor and its effect on tight gas enrichment of pore difference evolution in He 8-Shan 2 member,in order to study the deployment of tight sandstone gas development scheme.The results show that Upper Paleozoic He 8 to Shan 2 tight gas reservoir sandstone is low hole-ultra low hole,low permeability-ultra low permeability reservoir.Strong compaction and cementation are the main control factors that lead to the low porosity and special low porosity of sandstone gas reservoir in He 8-Shan 2 sec-tion respectively,and dissolution is the main control factor for the development of low porous reservoir sandstone.Early differential cementing is the main factor of the differential evolution of stored sandstone pores,which also leads to the occurrence of differential dissolution and late cementation.And the reservoir sandstone with high cement content has better gas content,in which unimpeded natural gas mainly occurs in inter-crystal hole,while more tight sandstone gas mainly occurs in the cement dissolution hole.
维普
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