东濮凹陷马厂地区沙二下亚段T-R旋回层序与沉积相模式  

T-R Sedimentary Cyclic Sequence and Sedimentary Facies Model of the Lower Submember Es_2 in Machang Area of Dongpu Depression

作　　者：谢英刚[1] 郭建华[2] 夏保华[3] 张椿华[3] 蒋小琼[4] 

机构地区：[1]江汉石油学院 [2]中南大学地学与环境工程学院 [3]中原油田分公司采油二厂 [4]中石化无锡实验地质研究所

出　　处：《断块油气田》2004年第1期23-25,共3页Fault-Block Oil & Gas Field

基　　金：湖北省教育厅自然科学基金资助项目 2 0 0 0A5 10 0 7

摘　　要：东濮凹陷马厂地区沙二下亚段是在湖盆萎缩期沉积形成的陆上冲积地层。本文在其中划分出 2个四级T -R旋回层序 ,每个层序由水进体系域和水退体系域构成 ,并且在区域范围内可追踪对比。同时提出洪泛平原沉积体系 ,并将其作为该区地层基准面抬升的标志。水进体系域内部构型以推移质和悬浮质混合沉积为主 ,其层系向上逐渐变薄 ,广泛发育厚层的洪泛平原沉积 ,只有少量的河道砂体孤立的分布于其中。水退体系域内部构型以砂—砾推移质沉积为主 。The lower submember Es 2 in Machang area of Dongpu depression was deposited in the atrophic epoch of the basin,formed by alluvial strata,divided into two Ⅳ-grade T-R cyclic sequences which are equivalent two Ⅳ-grade global climate change cyclic sequences.Each of sequences consists of base-level transgressive system tract and base-level regressive system tract,which can be traced and correlated in the studied area.In this article,the flood plain depositional system is put forward,which indicates the base-level uplift.When the base level gradually uplift,push-transporting deposition and suspend-transp orting deposition dominates the sedimentary types.Base-level transgressive system tract is built by the layers which gradually become thinner upward,and,at the same time,the thick wide flood plain depositional system and few isolated river channel sandstone grow in the transgressive system tract.When the base level gradrally lower,push-transporting deposition of sand-grit dominate the sedimentary types,and base-level regressive system tract is built by composite deposition of river channel sandstone.The braided river channel deposit grow widely.

关 键 词：T-R旋回层序 东濮凹陷 沉积体系 沉积旋回 沉积相模式 沉积物 

分 类 号：P618.13[天文地球—矿床学]