阜康凹陷东部二叠系—三叠系复式油气成藏特征及勘探方向

doi:10.3969/j.issn.1672-7703.2025.06.001

摘要/Abstract

摘要： 准噶尔盆地阜康凹陷东部近年来在二叠系—三叠系油气勘探中连续取得重要突破，但深层油气分布规律尚不明确，成藏机制复杂，仍面临系统性勘探挑战。基于最新勘探成果，结合地震解释、钻井资料及地质实验分析，对研究区烃源岩特征、构造演化过程、油气类型与分布规律以及成藏机制进行了系统研究。研究表明，阜康凹陷东部二叠系—三叠系具有“一源多储、多层系纵向叠置、多圈闭与多类型油气藏平面连片”的复式成藏特征。纵向上，以二叠系芦草沟组优质烃源岩为核心，在源内芦草沟组、近源上乌尔禾组和远源韭菜园组优质储层中形成了多类型油气聚集体系。平面上，这三套层系的油气藏类型分布特征相似，在凸起区以构造- 岩性圈闭为主，发育常规油气藏；斜坡至凹陷区以岩性圈闭为主，发育致密油气藏。典型油气藏解剖进一步揭示，不同层系的输导体系、油藏类型及运聚模式存在显著差异。基于新建立的油气成藏模式，进一步指导优选出阜中洼陷二叠系上乌尔禾组与三叠系韭菜园组作为近期重点勘探目标，并在实际钻探中取得显著突破，展现出该区作为准噶尔盆地新的亿吨级规模储量增长区的广阔前景。

关键词: 准噶尔盆地；阜康凹陷；二叠系；三叠系，致密油气；常规油气；复式油气聚集特征；勘探方向

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

中图分类号:

TE122.2

李明瑞,肖冬生,马强,康积伦,李士林,张伟,王力龙. 阜康凹陷东部二叠系—三叠系复式油气成藏特征及勘探方向[J]. 中国石油勘探, 2025, 30(6): 1-12.

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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