辽东湾地区辽中凹陷东营组湖底扇成藏差异性研究

doi:10.3969/j.issn.1672-7703.2021.03.009

摘要/Abstract

摘要： 渤海油田隐蔽油气藏勘探集中于辽中凹陷东营组湖底扇，不同构造区带湖底扇勘探成效差异很大。通过对辽中凹陷构造格架、沉积体系特征的对比研究，结合已钻湖底扇油气藏分布规律，认为深层汇聚能力、区域泥岩盖层厚度和烃源超压三大主控因素决定了湖底扇油气富集的程度，特别是深部结构特征形成的汇聚脊对他源型湖底扇高丰度油气藏形成具有至关重要的作用。据此将辽中凹陷东营组湖底扇成藏分为“汇聚脊—断层”“输导脊—断层”“烃源岩—断层”3种运移模式。辽中凹陷南洼凹陷区发育反转型汇聚脊，中洼西斜坡带发育断隆型汇聚脊，是寻找高丰度湖底扇油气藏的有利区带。上述运移模式的建立对他源成藏层系勘探具有一定的借鉴意义。

关键词: 辽中凹陷, 东营组, 湖底扇, 运移模式, 汇聚脊

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

中图分类号:

TE122.1

张宏国, 吕丁友, 官大勇, 王启明, 刘军钊. 辽东湾地区辽中凹陷东营组湖底扇成藏差异性研究[J]. 中国石油勘探, 2021, 26(3): 95-106.

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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