
第30卷第3期 2016年6月
现代地质 CEOSCIENCE
Vol. 30Ne.3 Jun. 2016
高分辨率层序地层划分在辫状河沉积相中的应用
一以北京延庆硅化木国家地质公园部面为例
吴鹏2.3,樊太亮12,王红亮"(1.中国地质大学(北京)能源学院,北京100083:
2.中国地质大学"海相储层演化与油气富集机理"教育部重点实验室,北京100083;3.中联煤层气有限责任公司,北京100011)摘要:通过对延庆硅化本国家地质公园剖面的观察实测、剖面精组解剖及沉积观察描述,识别出了释状河道、决口扇泛谨平原三种辩状河沉积的微相类型,并分析了其沉积特征。利用高分辨率层序地层学的基准面旋回变化原理,在所测面中划分出了两个完整的中期旋回和多个构成中期旋回的短期旋回,在研究区建立了高分辨率层序地层格架。总结了解状河野外露头基准面旋回转换面的两类识别标志:洪泛面及层序界面。洪泛面,包括河间潮湿泛滥平原泥岩发
,河道之间登置的决口扇(厚度较大处)及孤立的辫状河道层段。层序界面,包括
育段(需要具有一定厚度和分布范围),
泛溢平原泥岩段较少或不发育段,冲制面之上具有相互叠置特征的河道沉积位置及在一定范围内具有可对比性且规模较大河道的位置。在低A/S比值条件下产生的横向上叠加成片、纵向上相互叠置的解状河道砂体,其连通性相对较好,砂岩的厚度较大,泥质含量少,均质性较强,具有较强的可对比性。而在高A/S比值条件下产生的较少叠置或孤立河道砂岩,厚度较薄,横向上延伸范围有限,泥质含量高,可对比性较差。由此,初步形成了露头辨状河沉积相中高分
辨率层序地层划分的方法,为解状河沉积体系内高精度等时对比格架的建立、储层的识别与预测提供了依据。关键词:辨状河;露头;高分辨率层序地层;基准面旋回;沉积相;延庆
中图分类号:TE121.3;P618.130
文献标患码:A
文章编号:10008527(2016)03063508
Application of High-resolution Sequence Stratigraphy to Braided River Facies:Taking the YanqingSilicifiedWoodNational GeoparkSection
in Beijing as An Example
WU Peng1.2.3,FAN Tailiang-2,WANG Hongliang
(1. School of Energy Resotrces, China Unirersity of Grosciences, Bejing100083, China:
2. Key Laboratary of Marine Reserroir Eroludion and Hydrocarbon Accumulation Mechanism, Ministry of Education
Chine U/nitersity of Geosciences, Bejing 100083, Chin; 3. China U/siled Coalbed Methane Corporation, Lad., Bejing 100011, China)
Abstract : Through the observation and measurement on three braided river sedimentary outcrops of Yanqing Si-licified Wood National Geopark Section in Beijing, three braided river microfacies of braided channel, flood-plain and splay are been identified, and their sedimentary characteristics are analyzed. Two full medium-term cycles and some short cycles that constitute the medium-cycles are divided using the base-level cycles change principle of high-resolution sequence stratigraphy, and the stratigraphic framework is established. The cycle conversion surface identification of the braided river outcrop is summed up as the flooding surface and the se-quence boundaries. Flooding surfaces include the wet floodplain shale development segments with a certain thickness and distribution, the splay stacked locations with a larger thickness and the isolated channel layers.
收稿日期:2015-10-15:改回日期:2016-01-15;责任编辑:孙义梅。
基金项目:国家科技重大专项"复杂油气田地质与提高采收率技术“子课题"河流相层序地层技术规范及应用"(2009ZX05009一
002)。
作者简介:吴鹦,男,博土研究生,1988年出生,矿产善查与勘探专业,主要从事沉积学,层序地层学等方面的研究工作。
Email: wupengcugb@ 163. com。