Pore Structure Evolution of Tight Sandstone Reservoirs in the He 8 Member in Sudong Area

10.6911/WSRJ.202206_8(6).0082

Xing Liu；Yu Cheng；Jiacheng Dang

Sudong area ； petrological characteristics ； Physical properties ； Diagenesis ； Evolution of pore structure

World Scientific Research Journal

8卷6期（2022 / 06 / 01）

637 - 647

英文

The research on the evolution of reservoir pore structure occupies an indispensable position in the analysis of the main controlling factors of the reservoir. Based on the analysis of petrological characteristics, this paper analyzes the data of casting thin sections and scanning electron microscopy, combined with physical property testing methods and reservoirs. The pore structure evolution of the tight sandstone reservoir in the He 8 Member in the Sudong area was studied by observing the microstructure of the strata. The results show that the tight sandstone reservoir in the He 8 Member in the study area is mainly composed of lithic sandstone and lithic quartz sandstone. The characteristics of tight reservoirs with low structural maturity, low composition maturity, low porosity and low permeability are found; the relative content of dissolved pores is the largest, as its main reservoir space type, and at the same time, authigenic mineral intercrystalline pores and secondary dissolved pores are boxes. The oil and gas storage space of the tight reservoirs in the 8th Member has created important conditions; its densification process is characterized by compaction as the main and cementation as a supplement; combined with the analysis of its main accumulation time and sandstone densification time, it is considered that He 8 The tight sandstone in this section is characterized by tightness first and then accumulation. The research results can provide certain theoretical support for the exploration and development of natural gas in the later stage of the study area.