渤南洼陷断裂坡折带系统及其沉积模式

Fault Slope Break System and Control on Deposit Model in Bonan Depression,Bohai Bay Basin

从系统的角度出发,分析了渤南洼陷新生代断裂坡折带的构成、特征、演化及其沉积模式.渤南洼陷断裂坡折带系统是一个动态的系统,随着断裂的形成、消亡和盆地的演化,断裂坡折带可沿单阶型—多阶型—单阶型演变,这一动态演变不仅控制了不同时期洼陷中低位域砂体的横向分布,而且控制了低位域砂体的纵向沉积模式.其中,纵向沉积模式可归纳为3种类型:陡坡单阶型坡折带控砂模式、陡坡多阶型坡折带控砂模式、缓坡多阶型坡折带控砂模式.

The study reveals the fault slope break correlates intimately with the exploration of subtle oil and gas reservoir in fault basin. From the point of system, the active feature of Paleocene main faults in Bonan depression is analyzed. The law of formation and evolution of fault slope break and its control on low stand system sand body are studied. The results indicate that fault slope break belongs to dynamic system. With the formation and cessation of fault and the evolution of basin, the type of fault slope break may change from one-step to multi-step and to one-step again. The type evolution controls not only the distribution of low stand system sand body in basin during different periods, but also the deposit model of the sand body. Obviously, there are three types, such as the controlling sand body model of fault slope break with one-step and step muhion steep slope, the one of fault slope break with multi-step on gentle slope.