Hydrocarbon Accumulation Characteristics and Exploration Directions of the Permian–Triassic Composite Petroleum System in the Eastern Fukang Sag

doi:10.3969/j.issn.1672-7703.2025.06.001

Abstract

Abstract: In recent years, significant breakthroughs have been continuously achieved in the oil and gas exploration of the Permian–Triassic strata in the eastern Fukang Sag of the Junggar Basin. However, the distribution patterns of deep hydrocarbons remain unclear, the accumulation mechanisms are complex, and systematic exploration challenges persist. Based on the latest exploration results, integrated with seismic interpretation, drilling data, and geological experimental analyses, a systematic study was conducted on the characteristics of source rocks, tectonic evolution processes, types and distribution patterns of oil and gas, and accumulation mechanisms in the study area.Research indicates that the Permian–Triassic strata in the eastern Fukang Sag exhibit a composite accumulation characterized by “one source feeding multiple reservoirs, vertically stacked multi-layer systems, and planar continuity of multiple traps and diverse oil and gas reservoirs.”Vertically, centered on the high-quality source rocks of the Permian Lucaogou Formation, a multi-type hydrocarbon accumulation system has developed, encompassing the intra-source Lucaogou Formation, the near-source Upper Wuerhe Formation, and the far-source Jiucaiyuan Formation, all of which contain high-quality reservoirs. Laterally, the three sets of strata show similar distribution characteristics for their reservoir types: structural-lithologic traps dominate in uplift areas, developing = conventional reservoirs, whereas lithologic traps prevail from slope to sag areas, hosting tight reservoirs. Analysis of typical reservoirs further reveals significant differences in transport systems, reservoir types, and migration–accumulation models across different stratigraphic intervals. Guided by the newly established hydrocarbon accumulation models, the Permian Upper Wuerhe Formation and the Triassic Jiucaiyuan Formation in the central Fukang subsag were selected as key nearterm exploration targets. Remarkable breakthroughs achieved in subsequent drilling confirm the area’s strong potential as a new hundredmillion- ton-scale reserve growth zone in the Junggar Basin.

Key words: Junggar Basin; Fukang Sag; Permian; Triassic, tight oil and gas; conventional oil and gas; characteristics of composite petroleum system; Exploration direction

CLC Number:

TE122.2

Li Mingrui, Xiao Dongsheng, Ma Qiang, Kang Jilun, Li Shi Lin, Zhang Wei, Wang Lilong. Hydrocarbon Accumulation Characteristics and Exploration Directions of the Permian–Triassic Composite Petroleum System in the Eastern Fukang Sag[J]. China Petroleum Exploration, 2025, 30(6): 1-12.

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