东濮凹陷陡坡带北部控凹断裂样式及砂体充填模式

Sedimentary Filling Models and Types of Fault-Bounded Margin inActic Region of the Northeastern Dongpu Depression

东濮凹陷东部陡坡带北部边界发育 3 种样式的控凹断裂:单断板状边界断裂、犁状边界断裂和同向断阶边界断裂。3种断裂边界分别控制着不同的砂体分布及层序地层模式,陡坡带板状断裂边界控制着扇体充填模式;犁状断裂边界控制沉积中心(或生油洼陷)的分布发育和演化,湖侵体系域发育,以湖底扇砂体为主;同向断阶的分布则控制着较大规模的低水位扇的发育。

The marginal listric fault, slab-like fault and cocurrent fault-break zones are found in the analysis of the sedimentary facies in the northern slop zones of the Dongpu depression. The board margin consist of the listric fault with NE trend, the slablike fault with NNE trend and cocurrent fault-break zone, which have controlled the formation and evolution of the depression, and the deep sags or oil source centers were developed along the listric faults. The sequence stratigraphy in the down faults blocks of the marginal slab-like fault often consists of lowstand, transgressive and highstand systems tract by large volumes of sediments of alluvial fan, fan delta and subaqueous fan. The sand bodies in the down faults blocks of the marginal listric fault often mainly consists of subaqueous fan in transgressive systems tract. The distribution of lowstand delta were often controlled by the cocurrent fault-break marginal zones.