论文详情

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

断块油气田

2004年 11卷第01期

阅读：121

Title

T - R Sedimentary Cyclic Sequence and Sedimentary Facies Model of the Lower Submember Es2 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

单位

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

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,这些沉积构成了混合的向上逐渐加厚的河道充填复合体。

Abstract

The lower submember Es2 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; 水进—水退体系域; 沉积体系; 东濮凹陷; 沙二下亚段;

Keywords:

T - R depositional cycle , Transgressive Regressive systenm tract , Depositional system , Dongpu depression ,The lower submember Es₂

;

基金项目

DOI