| Based on the detailed investigation results of previous studies, this paper deeply study the reservoir essential characteristics of the 8th member and 1st member of the upper Paleozoic Permian in the East ? part of Sulige gas field and discuss the effect of diagenesis on reservoir properties, combined with the recovery of single well burial evolution, and reconstruct diagenesis and pore evolution history of the sandstone by means of various analytic and measurement methods. The research not only has theoretical significance, but also has important practical value in the natural gas exploration and development of the East part of Sulige gas field. The main results as follows:?The study area is mainly composed of sublitharenite and litharenite, only a litter quartzarenite. The value of porosity and permeability of sublitharenite is bigger than quartzarenite and litharenite.The main pore types of various types of sandstone in the study area are secondary pores and intercrystal pores. The pore structure configuration of sublitharenite is best.?The compaction and cementation cause the physical property decline, the dissolution can improve the properties, intergranular pore of reservoir make a contribution to reservoir space.?Throuth quantitative calculate the diagenesis strength and the effects on the physical properties of the various diagenesis, its showed that the compaction of the litharenite is strongest, the intercrystalline pores of quartzarenite make the largest contribution to reservoir pore volume; the strongest dissolution appeared in sublitharenite. And then establishes the corresponding burial history of pore evolution and recovery the accumulation period porosity of quartzarenite, sublitharenite and litharenite,the values are 8.85%,9.55% and 7.85%. The bearing gas properties of sandstone reservoir in the study area are controlled by reservoir physical property and pore throat structure. |
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