苏北盆地高邮凹陷陆相层序地层研究

Continental Sequence Stratigraphy Study of Gaoyou Sag in Subei Basin.

用层序地层学的观点分析了高邮凹陷戴二段三级层序各沉积时期湖泊水位升降、沉积速率与可容空间增加速率关系的变化、沉积体系、体系域及其在地震剖面上的响应。探讨了具沉积坡折边缘陆相湖盆初始湖泛面的确定 ,认为具沉积坡折边缘陆相湖盆的初始湖泛面就是湖水首次越过沉积坡折带的湖泛面。研究认为高邮凹陷戴二段初始湖泛面的出现时间大致在E2 d2 5 沉积晚期 ,最大湖泛面的出现时间大致在E2 d2 4沉积晚期 ,同时提出戴二段沉积晚期高位体系域与非湖泊体系域并存。

In the view of sequence stratigraphy in each sedimentary stage of the second member of Dainan Formation (E 2d 2)in Gaoyou sag,several aspects are analyzed,lake level fluctuation,relationship varation between sedimentary velocity and accommodation increasing velocity,sedimentary system,system region and their response on seismic section.The determination of initial lake flooding surface is also discribed.The result of study is that initial lake flooding surface is the surface when water first overlapped the shore break in continental fault depression,and it appeared at the late of E 2d 2 5 in the sedimentary period of E 2d 2 in Gaoyou sag.while it is believed the largest lake flooding surface appeared at the late of E 2d 2 4.