中文摘要：

白云凹陷位于南海北部被动大陆边缘, 断裂发育, 对油气的运聚成藏具有重要意义.研究表明, 始新世至早渐新世的断陷活动控制了烃源岩的发育, 晚渐新世至中中新世的断层活动控制了储层的分布, 晚中新世后的断层活化则影响了盖层和圈闭的展布.综合考虑泥岩涂抹作用和断裂活动性, 并结合最新勘探研究成果, 运用盆地模拟系统模拟研究了两条过井剖面, 结果表明： 白云凹陷断裂活动期次与排烃期次形成了较好的耦合关系, 主要的耦合期为23.8-16.5Ma和13.8-10.5Ma; 其中, 生烃增压作用可能强化了18.5Ma 时期的断裂活动; 当活动断裂处于开启状态时, 形成了良好的垂向运移通道; 平静期的断裂则倾向于封闭, 限制了油气的垂向运移; 与单独考虑断裂活动性相比, 泥岩涂抹作用能更好地反映静止期断层的封堵特性; 另外, 模拟预测显示白云深水区的南部断裂发育区具有更好的成藏条件, 易形成大型油气藏.

英文摘要：

The Baiyun Sag is located in the northern passive continental margin of the South China Sea. The widespread faultsaround the sag affect the migration and accumulation of hydrocarbon profoundly. Faults control the sedimentation of source rocksfrom the Eocene to the Early Oligocene, regulate the range of reservoirs from the Late Oligocene to the Middle Miocene anddominate the seals and traps during the reactivation period in the Late Miocene. We attempt to study the controls of fault activityon hydrocarbon migration and accumulation through faults sealing analysis and basin modeling. Results are as follows. （1） Theepisodes of fault activity couple well with the generation of hydrocarbon. （2） Overpressure due to hydrocarbon generation mayaccelerate faulting activity at ~18.5 Ma. （3） Active faults act as perfect conduits for vertical migration of hydrocarbon. （4） Shalesmear is much more credible in reflecting the sealing ability of motionless faults than the simple fault activity analysis. （5） Thesouthern faulted area in the deep water tends to be more favorable for hydrocarbon accumulation than the northern area.