Hydrocarbon accumulation characteristics and exploration orientation of the Permian–Triassic composite petroleum system in the eastern Fukang Sag, Junggar Basin

doi:10.3969/j.issn.1672-7703.2025.06.001

Abstract

Abstract: In recent years, significant breakthroughs have successively been achieved in the petroleum exploration of the Permian–Triassic in the eastern Fukang Sag, Junggar Basin. However, the distribution pattern of deep oil and gas remains unclear, and the accumulation mechanism is complex, leading to a series of exploration challenges. Based on the latest exploration achievements, and integrated with seismic interpretation, drilling data, and geological experimental analysis, a systematic study has been conducted on source rock characteristics, tectonic evolution history, oil and gas reservoir type and distribution pattern, and hydrocarbon accumulation mechanisms in the study area. The study results indicate that the Permian–Triassic in the eastern Fukang Sag exhibits a composite hydrocarbon accumulation pattern characterized by “one set of source rock and multi-set reservoirs, vertical superposition of multiple layers, and planar continuity of multiple traps and diverse oil and gas reservoirs”. Vertically, centered on the high-quality source rocks in the Permian Lucaogou Formation, a multi-type hydrocarbon accumulation system was developed in high-quality reservoirs in the intra-source Lucaogou Formation, near-source Upper Wuerhe Formation, and far-source Jiucaiyuan Formation. Laterally, the three sets of oil and gas reservoirs show similar distribution characteristics, generally including conventional oil and gas reservoirs in structural–lithologic traps in bulge zone, and tight oil and gas reservoirs in lithologic traps in slope–sag zone. The detailed analysis of typical oil and gas reservoirs further reveals that there are significant differences in transport system, reservoir type, and migration–accumulation mode across different layers. Guided by the newly established hydrocarbon accumulation mode, the Permian Upper Wuerhe Formation and the Triassic Jiucaiyuan Formation in Fuzhong subsag have optimally been selected as key exploration targets, and remarkable breakthroughs have been achieved in subsequent drilling operations, confirming promising prospects of large-scale reserve growth in Junggar Basin with a level of 100 million tons.

Key words: Junggar Basin, Fukang Sag, Permian, Triassic, tight oil and gas, conventional oil and gas, composite hydrocarbon accumulation characteristics, exploration orientation

CLC Number:

TE122.1

Li Mingrui, Xiao Dongsheng, Ma Qiang, Kang Jilun, Li Shilin, Zhang Wei, Wang Lilong. Hydrocarbon accumulation characteristics and exploration orientation of the Permian–Triassic composite petroleum system in the eastern Fukang Sag, Junggar Basin[J]. China Petroleum Exploration, 2025, 30(6): 1-12.

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