黄骅坳陷古近系层序地层格架特征及模式研究  

Paleogene sequence stratigraphic framework and model in the Huanghua depression

作　　者：苗顺德[1] 李秋芬[2] 欧阳诚[3] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]四川石油管理局,四川成都610051

出　　处：《中国地质》2008年第2期256-263,共8页Geology in China

摘　　要：层序地层学发展至今已有40多年历史.但在中国陆相盆地中的应用仅十多年.在很多盆地中还没有进行全面综合的层序地层格架建立,如黄骅坳陷地层格架划分标准和划分方案不统一。笔者在国内外学者研究的基础上.从层序划分原则入手,通过对一级、二级、三级层序和体系域界面特征和识别标志的研究.提出了该地区的层序划分方案,并将该地区古近纪地层划分为1个一级层序、3个二级层序和11个三级层序。通过对代表性剖面的研究.提出同生断裂坡折带和挠曲坡折带引起沉积斜坡明显突变,对盆地充填的可容纳空间和沉积作用产生重要影响.同时控制着层序和低位砂体的发育。建立了两种坡折带与层序关系的模式,并指出坡折带下部是有利低位砂体的发育带。Sequence stratigraphy has developed for over 40 years, but it was applied to continental basins in China only ten years ago. The integrated sequence stratigraphic framework for the entire stratigraphic succession has not been established in many basins such as the Huanghua depression. Based on previous research, proceeding from the principle of sequence division and through studies of the characteristics and identification indicators of different orders of sequences and system tract boundaries, the paper proposes a scheme of sequence division in the Huanghua depression and divides the Paleogene strata into 1 first-order sequence, 3 second-order sequences and 11 third-order sequences. Based on studies of typical sections, the authors propose that the abrupt change of the depositional slopes, resulting from the structural slope break zone or flexure slope break zone, has an important effect on the accommodation and sedimentation in the basin and that the structural slope break zone and flexure slope break zone control the development of the sequences and lowstand sand bodies. Two models for the relation between slope break zones and sequences have been constructed, and it is pointed out that the areas below the slope break zones are favorable zones for the deposition of lowstand sand bodies.

关 键 词：黄骅坳陷 古近系 层序地层 层序模式 

分 类 号：P539.2[天文地球—古生物学与地层学]