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

doi:10.3969/j.issn.1006-6535.2025.03.004

Abstract

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

CLC Number:

TE122

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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