荆门-当阳盆地上三叠统露头层序地层学研究  

Research on Outcrop Sequence Stratigraphy of Upper Triassic in Jingmen-Dangyang Basin

作　　者：陈留勤[1] 赵亮东[1] 段凯波[2] 霍荣[2] 

机构地区：[1]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《石油天然气学报》2009年第3期46-50,共5页Journal of Oil and Gas Technology

基　　金：中国石油化工集团公司海相前瞻性项目(YPH08009)

摘　　要：应用沉积学和层序地层学的基本原理和方法,对荆门-当阳盆地上三叠统两条实测剖面进行了沉积相分析和层序地层划分,同时分析了沉积相迁移规律、层序界面类型、层序发育特征及其控制因素。研究结果表明荆门-当阳盆地厚度约为1200m的上三叠统可以划分为4个三级层序(TS1、TS2、TS3和TS4)。层序界面类型主要有不整合面、岩性岩相转换面、河流冲刷侵蚀作用面等。从TS1-TS2到TS3-TS4沉积物组构从低能到高能的变化,表明层序发育特征受构造、古地理、古气候等因素的共同控制,研究区经历了从湖沼体系到冲积体系的转变。九里岗组以湖沼体系薄基底型含煤细粒沉积旋回为特征,盆地物源供应相对不足;王龙滩组以发育冲积体系厚基底型砂岩为主的沉积旋回为主,代表构造活动加强,盆地处于过饱和状态。Based on the basic principles of sequence stratigraphy and sedimentology, two measured sections of the Jingmen-Dangyang Basin were studied for sedimentary facies analysis and sequence stratigraphic division. Furthermore, facies transformation discipline, sequence boundaries and stratal stacking patterns and the dominating factors were also studied. The research indicates the upper Triassic can be divided into four third-order sequences, such as TS1, TS2, TS3 and TS4. The unconformity, lithology and lithofacies transition surface and river erosion surface are the main sequence boundaries. From TS1-TS2 to TS3-TS4, Jingmen-Dangyang Basin experiences the transformation from the lacustrine to the fluvial depositional system, which represents the initial characteristics of the northern Yangtze foreland basin. The Jiuligang Formation is characterized by the thin-substrate coal-bearing sedimentary cycles of lake and swamp facies, indicating an inadequate provenance. In contrast, the Wanglongtan Formation is composed of a series of thick-substrate sandstone dominated cycles, it presents intensification of structural activities and super-saturation of the basin.

关 键 词：荆门-当阳盆地 上三叠统 露头 层序地层 

分 类 号：P539.2[天文地球—古生物学与地层学] P512.2[天文地球—地质学]