张—扭断裂与油气运移分析——以渤海油区为例

油气运移是油气成藏的核心,也是当今世界油气地质学中最难研究的一个课题,是油气勘探中最难预测的一个因素。渤海油区上第三系为河流相沉积,不能生油,其圈闭中聚集的油气来自2000?5000m之下的下第三系烃源岩,因此油气运移的研究显得更为重要。断层是渤海油区主要的运移通道,经过十几年的理论与勘探实践的探索,认识到继承性发育的大断层可作为大—中型油田形成的运移通道,晚期活动的小断层运移能力有限,直立的走滑断层运移能力较差,地层—断层的产状配置控制了油气的聚集部位,凹陷内上第三系油田绝大多数分布在大断层的下降盘。

Tensional-shear Faults and Analysis of Oil and Gas Migration--Taking Bohai Oil Province for Example

Upper Tertiary in Bohai oil province is the sedimentation of fluvial facies, which has not source rock. The accumulated oil and gas in the trap came from the Lower Tertiary hydrocarbon source rock 2000~5000 meters below. Therefore, the study of oil and gas migration is of great importance. Fault is the main migration channel in Bohai oil province. Based on the exploration practice for decades, the large fault of successive development is regarded as the migration channel for shaping of the large and medium-size oil fields. The small fault in the activities of the late stages is limited in migration capability. The straight strike-slip fault is relatively poor in migration capability. The stratum-fault controls the position of oil and gas accumulation. The Upper Tertiary oil fields in the depression are mostly distributed in the downthrow block of the large fault.