【摘要】 渤海湾盆地历经多期构造变动,断层圈闭发育普遍。断层作为断层圈闭的边界条件,在油气成藏过程中起着至关重要的作用。以断层圈闭较发育的歧南斜坡区为例分析了同向断层和反向断层控制油气垂向富集的差异,基于三维地震资料,从断层形成过程和断层圈闭分布出发,剖析了断层遮挡圈闭的成因及分布规律。结合油水分布规律,基于油藏解剖并应用储层定量荧光技术明确了不同类型断层控藏的差异及其形成机理。研究表明:①断层分段生长作用和断层上盘与下盘的差异活动是同向断层控制下断层遮挡圈闭形成的主要原因,斜坡区反向断层控制形成的断层圈闭则是断块掀斜翘倾作用所致;②同向断层圈闭发育在断层上盘分段点位置,只有当同向断层进入"硬连接"阶段方可形成断层圈闭,反向断层圈闭形成在断层下盘,在反向断层活动初期便可形成;③同向断层既可以控制油气在多套含油气系统中聚集成藏,也可在一套含油气系统中富集,而反向断层往往控制油气在一套含油气系统中富集;④不同类型断层控制油气垂向聚集的差异与圈闭发育位置以及断-盖配置有关。采用泥岩涂抹系数对沙河街组一段中部盖层控制的含油气系统的垂向调整进行定量评价,泥岩涂抹系数低于3.5时油气保存,泥岩涂抹系数高于3.5时油气垂向渗漏。更多还原

【Abstract】 Bohai Bay Basin had undergone multi-period tectonic events,and fault traps were widely developed in this area.As the boundary condition of fault trap,faults played a vital role in hydrocarbon accumulation.Taking the Qi’nan slope with developed fault traps as an example,this paper analyzed the difference between the synthetic fault and antithetic fault in controlling the vertical oil and gas enrichment.Based on the 3 D seismic data,the fault growth process and fault trap distribution,the formation and distribution of the fault-screened traps were also analyzed.Combined with the oil and water distribution,reservoir interpretation as well as quantitative grain fluorescence analysis,the differences in the reservoir controlling and formation mechanisms of different types of faults were clarified.The results showed that:(1)the fault segmented growth and differential activities between the hanging wall and footwall could be the main reasons for the formation of fault-screened traps under the control of synthetic fault,while the fault traps formed by the antithetic fault in the slope area could be the result of fault block tilting and warping;(2)synthetic fault traps could be developed at the segmented growth point of the hanging wall only when the synthetic fault activity was in the"hard-linkage"stage,while the antithetic fault trap could be developed at the footwall when antithetic fault activity was in the early stage;(3)synthetic faults could control the hydrocarbon accumulation in one or multiple petroleum systems,while antithetic faults could often control the hydrocarbon enrichment in one petroleum system;(4)the difference of vertical hydrocarbon accumulation controlled by different types of faults could be related to the position of trap development and the fault-caprock configuration.Shale smear factor was used to quantitatively evaluate the vertical hydrocarbon adjustment in the petroleum system controlled by the middle caprock of Member 1 of Shahejie Formation.The oil and gas was preserved when the shale smear factor was less than3.5 but vertically leaked when the shale smear factor was higher than 3.5.更多还原