坡折带理论是层序地层学在陆相盆地应用中的新发展,前人的研究大多局限在顺源坡折方面,认为顺源坡折附近是低位域的有利发育区,易于形成地层岩性圈闭,而对于逆源坡折带控砂却很少提到。在对陈家洼陷的研究中,发现该区沙三下亚段中上部地层有继承性发育的多级次坡折带,且在各地层沉积时期坡折带的作用方式及大小存在差异。在坡折带识别及分析其与有利目标圈闭关系的基础上,重点提出了在具快速充填史的中小型断陷湖盆中,逆源坡折带对砂体发育的控制作用,即逆源坡折的倾斜程度及其与沉积物搬运方向的夹角大小控制了逆源坡折带附近的砂体分布形态。

The theory of slope break is a new achievement of sequence stratigraphy applied in continental basins. The former research showed that the slope breaks along source area direction are favorable for the generation of stratigraphic lithological t raps because of that the lowstand system tracts are easily developed in this area. The research on Chenjia Depression shows that mutual grade slope breaks are developed in the lower third member of Shahejie Formation. The controlling pat terns of the slope breaks in different depositional stages are different. Based on the slope breaks identification and the analysis of the relationship between the slope breaks and the favorable target traps, the controlling effect of the slope breaks opposing source area direction on sandstone distribution is proposed , especially in the middle and small faulted lake basins with rapid filling.