不同时期油源断裂输导油气有利部位确定方法及其应用

为了研究含油气盆地下生上储式生-储-盖组合中油气分布规律，在不同时期油源断裂输导油气机制及有利部位研究的基础上，通过利用地震资料确定油气成藏活动期油源断裂古活动速率相对较大部位和停止活动-封闭期油源断裂古凸面脊位置，建立了一套不同时期油源断裂输导油气有利部位的确定方法，并将其应用于渤海湾盆地冀中坳陷廊固凹陷大柳泉地区旧州油源断裂不同时期输导油气有利部位的确定中。结果表明：旧州油源断裂6条分支断裂在油气成藏活动期（沙河街组二段沉积期）发育6个输导油气有利部位，其中F₁断裂发育3个输导油气有利部位，F₂断裂发育2个输导油气有利部位，F₅断裂发育1个输导油气有利部位。旧州油源断裂在停止活动-封闭期（东营组沉积末期）发育12个输导油气有利部位，其中F₁断裂发育4个输导油气有利部位，F₂和F₃断裂各发育3个输导油气有利部位，F₄和F₅断裂各发育1个输导油气有利部位。旧州油源断裂有4个停止活动-封闭期输导油气有利部位与油气成藏活动期输导油气有利部位重合，有利于油气聚集成藏，与目前旧州油源断裂附近沙河街组三段中-下亚段已发现油气均分布在此4个重合部位这一现象相吻合，表明该方法用于确定不同时期油源断裂输导油气有利部位是可行的。

Determination method and its application of favorable positions for hydrocarbon transport in oil-source fault during different periods

To investigate the oil-gas distribution laws in the lower-generation and upper-reservoir type source-reservoir-caprock assemblage in the hydrocarbon-bearing basins, based on studying the oil-gas transport mechanisms and favorable positions in oil-source fault during different periods, and with the use of seismic data, this study determines the positions showing large paleo-activity rate in oil-source fault during the hydrocarbon accumulation activity period and the paleo convex-ridge in oil-source fault during the deactive closed period. Moreover, a set of methods are created to determine the favorable positions for hydrocarbon transport in oil-source fault during different periods, and applied to Jiuzhou, Daliuquan area, Langgu Depression, Jizhong Sag, Bohai Bay Basin. The results show that during the active period of hydrocarbon accumulation (the sedimentary period in Member 2 of Shahejie Formation), six favorable positions for hydrocarbon transport have been developed in six branches of Jiuzhou oil-source fault, including three in Fault F1, two in Fault F₂, and one in Fault F₅. During the deactive closed period (the late sedimentary period of Dongying Formation), twelve favorable positions for hydrocarbon transport are developed in Jiuzhou oil-source fault, including four in Fault F₁, three in Faults F₂ and F₃ for each, one in Faults F₄ and F₅, respectively. Moreover, four favorable positions for hydrocarbon transport in Jiuzhou oil-source fault during the deactive closed period are superposed with those during the active of hydrocarbon accumulation, which is beneficial to hydrocarbon accumulation. Meanwhile, the hydrocarbons discovered in the Mid-Lower Submember 3 of Shahejie Formation adjacent to Jiuzhou oil-source fault are all distributed in those four superposed positions, proving that this method is feasible to determine the favorable positions for hydrocarbon transport in oil-source fault during different periods.