准噶尔盆地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3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 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

中图分类号:

TE122.1

李明瑞, 肖冬生, 马强, 康积伦, 李士林, 张伟, 王力龙. 准噶尔盆地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 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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