泌阳凹陷南部陡坡带核三下段的控砂机制

THE CONTROLLING MECHANISM ON SANDBODY FACIES OF LOWER MEMBER OF EH3 OF STEEP SLOPE ZONE IN SOUTHERN BIYANG DEPRESSION

泌阳凹陷是一个南断北超的箕状断陷,唐河栗园断裂和泌阳栗园断裂的活动控制着断陷的形成和发展。研究认为,南部陡坡带砂砾岩在核三下段沉积时期受控于边界断裂、古地貌、物源、水动力及古气候等因素。其中断裂的活动强度及古地貌的影响因素占主导地位。通过研究陡坡带砂砾岩体发育及不同规模砂砾岩体分布与主要控制因素间的关系,从而建立了陡坡带的控砂模式。

Biyang Depression is a half graben basin with faulting in the south and overlapping in the north, the formation and development of the depression have been controlled by the activities of Tang-he Liyuan fault and Liyuan-Biyang fault. Studies suggest that during the sedimentary period of the lower member of Eh3 the sandbody in southern steep slope zone was controlled by the boundary fac- ture, palaeogeomorphology, material sources, hydrodynamic force and palaeoclimate and other factors, of which the fracture activities intensity and the palaeogeomorphology were the dominant factors. By research on the relationship between the development of sandbodies in the steep slope zone and distributions of the sandbodies in different scale and the major controlling faetors,a sandhodies controlled model of steep slope zone was set up.