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.