准噶尔盆地中央坳陷二叠系烃源岩差异热演化及生烃特征对油气富集规律的影响

doi:10.3969/j.issn.1006-6535.2025.03.005

摘要/Abstract

摘要： 准噶尔盆地中央坳陷二叠系烃源岩是盆内最重要的油气来源,为梳理“源控”背景下的多相态油气成烃演化与富集规律,运用盆地模拟和实验分析技术,恢复了中央坳陷不同富烃凹陷区二叠系烃源岩热演化史、生烃史及成藏过程。研究表明:二叠系烃源岩在晚三叠世开始成熟,现今主体处于高成熟生凝析油气阶段,凹陷中心多已达到过成熟阶段;二叠系烃源岩生烃过程可分为持续充注成熟富油少气型、多期调整深埋高熟富气型、早期散失早成熟富油气型3种富集模式,烃产率峰值最高可达450 mg/g;玛湖凹陷致密油及页岩油、盆1井西—沙湾凹陷西环带三叠系常规油、东环带二叠系致密气、东道海子凹陷二叠系源内页岩气为研究区4个油气富集领域。研究结果可为该区下一步油气勘探提供重要支撑。

关键词: 烃源岩, 热演化, 油气成藏, 二叠系, 准噶尔盆地

Abstract: The Permian hydrocarbon source rocks in the central depression of the Junggar Basin are the most important source of oil and gas in the basin. To sort out the hydrocarbon-generation evolution and enrichment patterns of multi-phase oil and gas under the "source control" background, basin simulation and experimental analysis techniques were employed to reconstruct the thermal evolution history, hydrocarbon generation history, and accumulation process of the Permian hydrocarbon source rocks in different hydrocarbon-rich depressions of the central depression. The study shows that the Permian hydrocarbon source rocks began to mature in the Late Triassic and are currently mainly in the high-maturity condensate gas generation stage, mostly reaching the over-mature stage in the depression centers. The hydrocarbon generation process of the Permian hydrocarbon source rocks can be divided into three enrichment patterns: continuous injection of mature oil-rich and gas-poor type, multi-stage adjustment of deeply buried high-maturity gas-rich type, and early loss of early-mature oil and gas-rich type, with the peak hydrocarbon generation rate reaching up to 450 mg/g. The Mahu Sag tight oil and shale oil, the conventional oil of the Triassic system in the western annular zone of the Shawan Sag (west of Well Pen 1), the tight gas of the Permian system in the eastern annular zone, and the shale gas within Permian source in the Dongdaohai Sag are the four oil and gas enrichment areas in the study area. The research results can provide important support for the next step of oil and gas exploration in this area.

Key words: hydrocarbon source rock, thermal evolution, hydrocarbon accumulation, Permian, Junggar Basin

中图分类号:

TE122.2

韩杨, 杨海波, 蒋文龙, 杨皝, 项威, 郭文建, 王韬. 准噶尔盆地中央坳陷二叠系烃源岩差异热演化及生烃特征对油气富集规律的影响[J]. 特种油气藏, 2025, 32(3): 35-46.

HAN Yang, YANG Haibo, JIANG Wenlong, YANG Huang, XIANG Wei, GUO Wenjian, WANG Tao. Influence of differential thermal evolution and hydrocarbon characteristics of Permian hydrocarbon source rocks on hydrocarbon enrichment pattern in the central depression of Junggar Basin[J]. Special Oil & Gas Reservoirs, 2025, 32(3): 35-46.

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