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针对车镇凹陷车西洼陷是否存在油气倒灌运移成藏这一问题,从基本地质特征分析入手,对油源对比、有效烃源岩展布特征、烃源岩与储层对接关系进行了研究。结果表明,沙三段烃源岩是车西洼陷的有效烃源岩,沙四段上亚段油藏为“上生下储”型,沙三段4700m以下有效烃源岩存在油气倒灌成藏现象。源储对接关系分析表明,曹家庄断阶带以北洼陷区沙四段上亚段油藏中的原油来自上部沙三段烃源岩。油气成藏要素剖析结果表明,沙三段与沙四段上亚段“厚泥下砂”的岩性匹配关系、沙三段烃源岩超压、烃源岩与储层之间的压差以及隐蔽输导体系是油气倒灌运移成藏的主控因素;油气倒灌运移距离与烃源岩剩余压力具有正相关关系,烃源岩之下储层的物性条件对其含油性具有控制作用。
Aiming at the problem of hydrocarbon accumulation in the Chexi Sag of Chezhen Sag, starting with the analysis of basic geologic features, the author has compared the relationship between oil source, the distribution of effective source rocks, the docking of source rocks and reservoirs the study. The results show that the Es3 source rock is an effective hydrocarbon source rock in Chexi Sag, and the upper Es4 reservoir in the Es4 is an “uplifted reservoir” type. The effective source rocks below 4700m in the Es3 have oil and gas Inverted reservoir formation phenomenon. The analysis of source-reservoir docking shows that the crude oil in the Upper Member of the Es4 Member in the northern sub-depression of the Caojiazhuang fault zone comes from the source rocks of the third member of Upper Shahejie Formation. The analysis results of hydrocarbon accumulation factors show that the lithologic matching relationship between the Upper Member of Shahejie Formation and the Lower Member of Shahejie Formation and that of the Lower Member of Shahejie Formation, the overpressure of source rocks of Es3 Member and the relationship between source rocks and reservoirs The pressure difference and the hidden guidance system are the main controlling factors for oil and gas migration. The hydrocarbon migration and migration distance has a positive correlation with the residual pressure of the source rock. The physical properties of the reservoir under the source rock have a positive correlation with the oil- Control effect.