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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第12期    总第292期    2018年12月

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文章编号:1672-7207(2018)12-3002-09
T-R旋回在东濮凹陷的应用:以古近纪沙河街期为例
肖明国1,李杰2, 3,郭建华2, 3,郭祥伟2, 3,王玺凯2, 3,谭慧1, 2, 3,刘辰生2, 3

(1. 湖南华晟能源投资发展有限公司,湖南 长沙,410083;
2. 中南大学 地球科学与信息物理学院,湖南 长沙,410083;
3. 中南大学 有色金属成矿预测与环境监测教育部重点实验室,湖南 长沙,410083
)

摘 要: 基于不同级次的T-R旋回对应于不同的储层分级,在不同环境中的T-R沉积旋回中,储集砂体的分布特征也明显不同,通过沉积相突变带、生物绝灭带、物源变化等对沙河街组不同级次的T-R旋回层序进行划分。研究结果表明:沙河街组可划分出2个二级旋回、9个三级旋回和3类沉积体系的组合模式;层序格架内主要由冲积扇、河流、(扇)三角洲、湖底扇、滨浅湖、深湖、深盆盐湖等沉积体系组成;在湖近体系域中,主要沉积体系是水下扇、辫状河三角洲、滩坝、滨浅湖、湖湾、半深湖—深湖;在湖退体系域中,主要沉积体系为扇三角洲、辫状河三角洲、半深湖—深湖、湖底扇以及深水盐湖沉积体系,但其分布与组合也明显受盆地古地貌形态、构造(控凹断层)活动强度、气候及物源等因素控制。

 

关键词: 断陷盆地;层序地层;T-R旋回;东濮凹陷;沙河街期

Application of T-R cycles in Dongpu sag: taking Shahejie stage of Paleogene as an example
XIAO Mingguo1, LI Jie2, 3, GUO Jianhua2, 3, GUO Xiangwei2, 3, WANG Xikai2, 3, TAN Hui1, 2, 3, LIU Chensheng2, 3

1. Hunan Huasheng Energy Resource Investment & Development Co. Ltd., Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,
Ministry of Education, Central South University, Changsha 410083, China

Abstract:With consideration that different orders of T-R cycles correspond to different reservoir grades, and the distribution characteristics of the sand bodies are also significantly different in T-R sedimentary cycles in different environments, the T-R cyclic sequences of different orders in Shahe formation were subdivided into two 2nd order cycles and nine 3rd order cycles based on sedimentary facies, extinction zone and provenance changes. The results show that the framework is mainly composed of alluvial fan, fluvial system, (fan) delta, sublacustrine fan, shallow lake, deep lake and deep saline lake basin sedimentary system, etc. The subaqueous fan, braided river delta, shallow lake, bay and deep lake mainly develop in transgressive system while the regressive system is composed of fan delta, braided river delta, semi-deep to deep lake and salty deep lake etc, but its distribution and association are affected by factors such as paleogeomorphy, intensity of tectonic(active faults) and provenance.

 

Key words: fault basin; sequence stratigraphy; T-R cycle; Dongpu depression; Shahejie Stage

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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