深大断裂在油气藏形成中的作用

FUNCTION OF DISCORDOGENIC FAULTS DURING FORMING OF HYDROCARBON POOLS

纵观我国东部裂谷系中松辽、渤海湾、江汉及南海等几个重要的含油气盆地发现油气田的分布与盆地中断开基底、地壳或岩石圈的深大断裂有相伴出现的现象，分析深大断裂与沉积、构造、地温场及压力场的相关性后发现：深大断裂控制了沉积体系及沉积相带的展布；控制了地温场的展布；从而控制了油气藏形成条件的生、储、盖因素。深大断裂还控制了盆地内构造区带的展布、控制了流体压力场的展布，从而控制了油气藏形成条件的运移与聚集因素。因此，深大断裂控制了含油气盆地中油气藏的分布；查清深大断裂的分布是提高勘探成功率的重要途径。

Generally viewing, in important hydrocarbon-bearing basins, such as Songliao, Bohai Gulf,Jianghan ,and Nanhai basins in rift system of eastern China ,distributions of oil and gas fields are associated with the discordogenic faults of rift basement of basin ,the Earth's crust or lithosphere. By analyzing the correlativity of discordogenic faults with deposition ,tectonic ,geothermal field and pressure field, it is found that discordogenic faults control the distribution of depositional systems and sedimentary facies zones, and control the distribution of geothermal field. Thus ,discordogenic faults control the generating ,reservoir and capping factors in forming of hydrocarbon pools. Discordogenic faults also control the distribution of structural zones in basins ,and the distribution of flowing fluid pressure field. Thus ,also control the migration and accumulation factors for forming of hydrocarbon pools. So discordogenic faults control the distribution of hydrocarbon pools in hydrocarbon-bearing basins. Discordogenic fault is important for predicting distribution of oil and gas fields. To find out the distribution of discordogenic faults is an important way for improving the successful rate of exploration