渤海湾盆地辽河坳陷东部沙三段煤成油地质特征与资源潜力

doi:10.3969/j.issn.1006-6535.2025.03.004

摘要/Abstract

摘要： 针对辽河坳陷东部凹陷沙三段高含蜡原油成因与来源不明、勘探潜力认识不清等问题。通过综合分析东部凹陷沙三上亚段成煤环境、煤系地层烃源岩指标及原油地球化学特征,剖析源储配置与生烃潜力,明确了煤成油成藏主控因素。研究表明:东部凹陷沙三上亚段为断—坳转换期,构造稳定背景下湖盆逐渐淤填,形成大面积的泛滥平原沉积;煤系地层稳定发育,煤系烃源岩富含壳质组与基质镜质体,具有较强的生油能力。聚煤中心煤系烃源岩厚度大、构造变形区裂缝输导体系发育、煤砂近距离直接配置是煤成油富集成藏的主要控制因素。东部凹陷沙三上亚段煤系地层能够生油,煤成油总资源量达0.8×10⁸ t,带动了勘探发现,扩展了新的烃源岩层系,对于辽河坳陷乃至渤海湾盆地煤系地层的勘探具有重要的借鉴作用。

关键词: 煤成油, 生物标志物, 主控因素, 沙三上亚段, 东部凹陷, 渤海湾盆地

Abstract: The cause and source of high-wax crude oil in the third member of Shahejie Formation in the eastern sag of Liaohe Depression, as well as its exploration potential, remain unclear. Through comprehensive analysis of the coal-forming environment, coal-measure hydrocarbon source rock indices, and crude oil geochemical features of the upper sub-member of the third member of Shahejie Formation in the eastern sag, the source-reservoir configuration and hydrocarbon-generating potential were assessed, which clarified the main controlling factors for coal-derived oil accumulation. The study shows that the upper sub-member of the third member of Shahejie Formation in the eastern sag is a period of fault-depression transition, in which the lake basin gradually silts and fills up under the background of stable tectonics, forming a large area of floodplain deposits; the coal-measure stratum is stably developed, and the coal-measure hydrocarbon source rocks are rich in chitin groups and desmocollinite, which have strong oil-generating capacity. The main controlling factors for coal-derived oil accumulation are the large thickness of coal-measure hydrocarbon source rocks in coal accumulation centers, thedevelopment of fracture transport systems in tectonically deformed zones, and the close and direct configuration of coal and sand. The coal-measure strata of the upper sub-member of the third member of Shahejie Formation in the eastern sag can generate oil, with a total coal-derived oil resource of 0.8×10⁸ t. This finding has led to exploration discoveries, expanded new source rock series, and offers significant reference for exploring coal-measure strata in the Liaohe Depression and the entire Bohai Bay Basin.

Key words: coal-derived oil, biomarkers, main controlling factors, upper sub-member of the third member of Shahejie Formation, eastern sag, Bohai Bay Basin

中图分类号:

TE122

于雪峰, 于福生, 郭强, 黄双泉. 渤海湾盆地辽河坳陷东部沙三段煤成油地质特征与资源潜力[J]. 特种油气藏, 2025, 32(3): 26-34.

YU Xuefeng, YU Fusheng, GUO Qiang, HUANG Shuangquan. Geological characteristics and resource potential of coal-derived oil in the third member of Shahejie Formation in the eastern sag of Liaohe Depression, Bohai Bay Basin[J]. Special Oil & Gas Reservoirs, 2025, 32(3): 26-34.

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