陆相“红层”等时地层对比新方法在东营凹陷南斜坡的应用

"红层"地层缺乏古生物,俗称"哑地层",地层地质年代研究难度大,缺乏稳定的岩电标志,等时对比缺乏有效的方法手段。利用古生物、录井、测井及地震等资料对"红层"的地层特征、层序地层对比理论和对比方法进行研究。结果表明:"红层"缺乏明显的低水位体系域沉积,湖平面主要受季节性洪水控制,地层明显呈现出二分性的特征;将Vail与Cross两套层序地层学理论体系有机结合,可以有效地解决"红层"地层划分难的问题;通过"宏观界面约束-内部精细旋回划分-多因素综合"的地层对比方法流程可以很好地建立研究区的层序地层格架。

Application of new method of time-stratigraphic comparison of terrestrial red beds in southern slope of Dongying depression

The red beds are commonly known as "the barren stratum" because of lacking paleontological fossils.For the difficulty in the strata geologic age research and the shortage of stable rock electric signs,there are many difficulties in the isochronous correlation research.Based on palaeontology,logging,well logging and seismic,the strata feature,correlation theory of sequence stratigraphy and correlation method of the red beds were studied.The results show that the red beds take on the dichotomy clearly because of the lack of low stand systems tract sediment and the lake level is controlled by seasonal flood.The difficulty of stratigraphic division for the red beds could be solved effectively through dynamic integration of the theory of sequence stratigraphy of "Vail+Cross".A fine stratigraphic framework suitable for the study area can be established by the method of stratigraphy analysis,which is "macro-interface constraint,internal-fine cycle division,controlled by multi-factor method".