【作者】 解国军； 金之钧；

【Author】 Xie Guojun Jin Zhijun(Petroleum Vuiversity Basin and Oil Deporsit Research Center, Beijing)

【机构】 石油大学盆地与油藏研究中心；

【摘要】 从盆地演化周期的角度来分析,前陆盆地的演化可分为前前陆盆地阶段、前陆盆地阶段和后前陆盆地阶段.前前陆盆地演化阶段一般为被动陆缘沉积的特点,沉积速率较低,油气成藏条件不活跃,不利于油气藏形成;前陆盆地演化阶段,是前陆盆地的定型期,盆地沉降和沉积速率高,沉积厚度大,是油气的主要成藏期,油气成藏的建造与破坏过程共存,后前陆盆地演化阶段,盆地的建造过程停止,表现为区域性抬升剥蚀,油气成藏的主要特点是油气的内部调整和保持.基于油气成藏期和前陆盆地的演化特点,现今活跃的前陆盆地以晚期成藏为主,对于早期形成的稳定的前陆盆地,以早期成藏为主.中国西部前陆盆地晚期成藏特点明显,但在相对稳定的构造单元中可能保存早期形成的油气藏.更多还原

【Abstract】 In view of basin evolution cycles, the development of foreland basin can be divided into pre-foreland basin stage, foreland basin stage and post-foreland basin stage. Pre-foreland basin stage is characteristic of passive continental margins with lower sedimentation velocities. Foreland basin stage is the time to build the basins. In this stage, large amount of sediments fill in basins with high sedimentation speeds, result in large mass of accumulation. Basin construction ceased in accordance with uplift and erosion at the post-foreland basin stage. The conditions for hydrocarbon accumulation are not active at pre-foreland basin stage, and unfavorable for reservoir formation. Foreland basin stage is the main period for hydrocarbon accumulations. Reservoir construction and destruction coexist in this stage. The main character of reservoir formation in post-foreland basin stage is the internal adjustment and keep of oil and gas. On the basis of hydrocarbon accumulation period and foreland basin revolution, we can conclude that oil and gas accumulations are in a latter period in an active foreland basin, but to an old stable foreland basin, hydrocarbon accumulation stage is in an earlier period. Reservoir formations in western China foreland basins were in a latter time, but some pools formed in an earlier time may be kept in stable structure elements.更多还原