Study on hydrocarbon accumulation difference of sub-lacustrine fan in Dongying Formation in Liaozhong Sag, Liaodong Bay

doi:10.3969/j.issn.1672-7703.2021.03.009

Abstract

Abstract: The exploration of subtle reservoirs in Bohai Oilfield is concentrated in the sub-lacustrine fan of Dongying Formation in Liaozhong Sag, which has greatly different results in different structural zones. The correlation study of structural framework and sedimentary system characteristics in Liaozhong Sag, and the distribution law of sub-lacustrine fan oil and gas reservoirs from well data, indicate that the enrichment degree of hydrocarbon in sub-lacustrine fan is mainly controlled by three factors, namely the accumulation capability in deep formation, thickness of regional mudstone caprock and overpressure of source kitchen. In particular, the catchment ridge formed in deep structures plays an important role in forming high-abundant external source type sub-lacustrine fan oil and gas reservoirs. Based on this understanding, hydrocarbon migration and accumulation pattern of sub-lacustrine fan oil and gas reservoirs in Dongying Formation in Liaozhong Sag is divided into three types, i.e., “catchment ridge – fault”, “transporting ridge – fault” and “source rock – fault”. The inversion type catchment ridge in the sag areas of southern sub-sag, and fault – uplifting type catchment ridge in the western slope of central sub-sag in Liaozhong Sag are favorable plays for searching for high abundant sub-lacustrine fan oil and gas reservoirs. The above migration model has a certain reference significance for the exploration of other external source type oil and gas reservoirs.

Key words: Liaozhong Sag, Dongying Formation, sub-lacustrine fan, migration model, catchment ridge

CLC Number:

TE122.1

Zhang Hongguo, Lv Dingyou, Guan Dayong, Wang Qiming, Liu Junzhao. Study on hydrocarbon accumulation difference of sub-lacustrine fan in Dongying Formation in Liaozhong Sag, Liaodong Bay[J]. China Petroleum Exploration, 2021, 26(3): 95-106.

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