富油凹陷洼槽区油气成藏机理与成藏模式——以冀中坳陷饶阳凹陷为例

发布时间：2018-05-04 16:32

本文选题：富油洼槽 + 成藏机理　；参考：《石油学报》2017年01期

【摘要】：随着正向构造带勘探难度的增加,洼槽区逐渐成为渤海湾盆地富油凹陷增储上产的重要领域,而成藏机理的特殊性制约了洼槽区勘探的深入。以冀中坳陷饶阳凹陷为研究对象,通过对洼槽生烃能力、油气成藏时期、成藏动阻力条件以及输导体系等分析,探讨了富油凹陷洼槽区油气藏的形成机理及模式。研究表明,饶阳凹陷富油洼槽区有效生烃范围大,热演化程度较高,存在东营组沉积末期和新近纪明化镇组沉积期2期主要生烃及成藏过程;东营组沉积末期油气充注范围较小,储层物性好,成藏阻力小;而明化镇组沉积充注时期,储层物性差,成藏阻力大,但剩余压力大,油气成藏动力强。洼槽中心区的油气多沿源岩层系中的砂体、裂缝和小断层等进行短距离运移聚集形成岩性为主的油气藏;洼槽边缘区往往发育深切入烃源岩的油源断层,成为油气垂向运移的重要通道,油气沿断层运移聚集形成构造为主的油气藏。富油洼槽区存在"源内-两期成藏-隐蔽输导-短距离运移"与"源外-单期成藏-断裂输导-垂向运移"2种油气成藏模式,成藏动、阻力条件控制着洼槽区有效烃源岩层系内油气成藏的物性下限,而断层为主体的输导体系分布特征及有效性控制着洼槽区源外油气的分布和富集程度。
[Abstract]:With the increasing difficulty of exploration in the forward structural zone, the depression area has gradually become an important field of increasing reservoir and production in the oil-rich depression of the Bohai Bay basin, and the particularity of the reservoir forming mechanism restricts the exploration of the depression area. Taking the Raoyang sag of Jizhong depression as the research object, the formation mechanism and model of oil and gas reservoirs in the trough area of rich oil depression are discussed by analyzing the hydrocarbon generation ability of the depression, the period of hydrocarbon accumulation, the conditions of the dynamic resistance of the reservoir formation and the transportation system. The results show that the range of effective hydrocarbon generation and thermal evolution in Youwa trough area of Raoyang depression are large and there are two main hydrocarbon generation and reservoir forming processes in the late sedimentary period of Dongying formation and the sedimentary period of Neogene Minghuazhen formation. At the end of Dongying formation, the oil and gas filling range is small, the reservoir physical property is good, and the reservoir forming resistance is small, while in Minghuazhen formation, the reservoir physical property is poor, the reservoir forming resistance is large, but the residual pressure is large, and the oil and gas reservoir forming power is strong. The oil and gas in the central area of the depression mainly migrate and gather along the sand bodies, fractures and small faults in the source rock series for short distance to form oil and gas reservoirs dominated by lithology, and oil source faults with deep cut into the source rock are often developed in the edge area of the depression trough. It is an important passage for vertical migration of oil and gas, and oil and gas accumulates along faults to form oil and gas reservoirs dominated by structure. There are two types of oil and gas accumulation models, I. e., in-source and two-stage pool-forming, subtle transportation-short-distance migration, and "extrasource-single-period pool-forming, fault-transportation-vertical migration" in the oil-rich depression area. The resistance condition controls the lower limit of physical properties of hydrocarbon reservoir formation in the effective source rock series in the depression area, while the distribution characteristics and validity of the fault system control the distribution and enrichment degree of the oil and gas outside the source.
【作者单位】：中国石油华北油田公司;中国石油大港油田公司;中国石油大学地球科学与技术学院;
【基金】：中国石油天然气集团公司重大科技专项(2014E-35) 国家重大科技专项(2016ZX05006-003)资助
【分类号】：P618.13

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