China Petroleum Exploration ›› 2024, Vol. 29 ›› Issue (5): 120-135.DOI: 10.3969/j.issn.1672-7703.2024.05.010

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Characteristics and controlling factors of deep and ultra-deep Permian clastic reservoir in Junggar Basin

Sun Jing, You Xincai, Zheng Menglin, He Wenjun,Chang Qiusheng,Wang Tao   

  1. Research Institute of Exploration and Development, Xin jiang Oil field Company, PetroChina
  • Online:2024-09-14 Published:2024-09-14

Abstract: The deep-ultra deep Permian clastic rock reservoir in the Junggar Basin has been continuously discovered and broken through in recent years, and has become one of the key areas of basin exploration and development, but its overall development characteristics and control factors are still unclear. Coring, logging, thin section analysis and laboratory analysis data of the key wells are used to study and analyze the basic development characteristics and main control factors of its reservoir. This study argued that the deep-ultra deep Permian clastic reservoirs are mainly delta distributary channel conglomerate, followed by sandstone. The gravel is mainly composed of tuff, and the cements are mainly zeolite and calcite, with a well-developed muddy matrix. The storage space is mainly composed of pores and fractures, forming three types of combinations, that are pore, fracture, and pore fracture composite type. The pores are mainly secondary dissolution pores, and three development zones of secondary pores are formed vertically. The cracks are mainly compacted microcracks. The rock composition, diagenesis, and formation overpressure are the main controlling factors for the formation of effective reservoirs, jointly controlling the formation, evolution, and distribution of relatively effective reservoirs in the deep-ultra deep Permian.

Key words: Junggar basin, deep-ultra deep, Permian, clastic reservoir, reservoir characteristics, controlling factor

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