断坡带对沉积体系的控制作用——以琼东南盆地为例

应用“断坡带”概念，识别了琼东南盆地断坡带的主要类型和发育特征，分析了其对盆地的沉积分区、沉积砂体分布样式的控制作用，以及研究了该盆地断坡带的多级性及其在盆地不同的充填演化时期对不同沉积相带空间展布的控制作用。琼东南盆地断坡带不仅控制了各凹陷古近纪低水位和高水位时的可容纳空间和水深的变化，还控制了其深积体系和沉积体系域的时空分布，尤其是各层序低水位期和高水位期的断坡带，直接控制了各层序发育时的古隆起区、滨海平原区、浅海（浅水）区和浅海（深水）区分布范围，影响着琼东南盆地的烃源岩规模、输导层（体）特征、储集层规模与物性及其盖层发育的宏观特点等。

Controlling role of fault-break zones on sedimentary system-Taking Qiongdongnan basin as an example

This article identified major fault-break zones types and their characteristics based on concept of fault-break zones in Qiongdongnan basin. And the authors respectively analyzed their control action on the depositional subarea and distributing of sedimentary sandbodies in Qiongdongnan basin. Ultimately, the authors summarized multilevel of fault-break zones and thier controlling on spatial distribution of sedimentary facies in different evolvement epoch in the Qiongdongnan basin. The fault-break zones not only controlled the changes of water-depth and accommodation at the low-stand and high-stand periods, but also controlled the distribution of sedimentary system and sedimentary system tracts of strata in the each depression of Qiongdongnan basin. Especially the fault-break zones developed in low-stand and high-stand periods that fairly control the location of ancient-uplift, seashore-plain, and shallow and deep-water units of shallow sea as each sequence strata developed. From the mentioned above, the scales of resource rocks, characteristics of passage layer (body), scale and quality of reservoir and seal characteristics etc. can be estimated. This is significant for oil and gas exploration in Qiongdongnan basin.