Diagenesis and Reservoir Formation Effect of Tight Sandstone in Lower Permian Shihezi Formation, Dongsheng Gasfield

doi:10.3969/j.issn.1006-6535.2021.05.010

Abstract

Abstract: In response to the poor understanding of the diagenesis and reservoir formation effect of sandstones in Dongsheng Gasfield, Ordos Basin, the lithological characteristics, pore-permeability characteristics, reservoir space types and diagenetic characteristics of the reservoirs in Dongsheng Gasfield were studied in depth through core observation and description on the basis of slice observation, cathode luminescence, scanning electron microscope, X-ray diffraction and physical characteristic analysis, and other materials, the diagenetic evolution stages and evolutionary sequence of reservoir were determined, and the reservoir formation effect was discussed systematically. The results of the study showed that the reservoir sandstones of the lower Shihezi Formation in Dongsheng Gasfield, Ordos Basin were mainly in the Stage A of mesozone rock, and partly in Stage B of mesozone rock, with medium compositional maturity and low textural maturity; the secondary vugular pore was the main storage space, and the reservoir was a typical low-porosity and low-permeability reservoir; the sandstone diagenesis in the study area mainly included mechanical compaction, cementation and dissolution, among which mechanical compaction, carbonate cementation and siliceous cementation reduced the porosity and were important causes of reservoir densification, while the secondary pores formed by dissolution was conducive to improving the physical properties of the reservoir. The characteristics, diagenetic evolution and reservoir formation relationship of lower Shihezi Formation, Dongsheng Gasfield were studied in order to provide some reference and guidance for further exploration of tight sandstone gas in the study area.

Key words: low porosity and low permeability, tight sandstone, diagenesis, reservoir formation effect, Dongsheng Gasfield, Ordos Basin

CLC Number:

TE122

Tan Dongping, Luo Long, Tan Xianfeng, Wang Jia, Gao Xuanbo, Cao Tongsheng, Zhou Huanhuan, Zha Xiaojun. Diagenesis and Reservoir Formation Effect of Tight Sandstone in Lower Permian Shihezi Formation, Dongsheng Gasfield[J]. Special Oil & Gas Reservoirs, 2021, 28(5): 68-76.

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