| 本文已被：浏览 126次 下载 154次 |
码上扫一扫！ |
| 中扬子区寒武纪层序地层研究 |
| 周雁,陈洪德,王成善,金之钧,汤良杰,王正元,梁西文 |
|
|
(1. 石油大学 资源与环境学院, 北京 102200;
2. 成都理工大学 油气藏地质与开发国家重点实验室, 四川 成都 610059;
3. 中国石化江汉油田分公司 研究院, 湖北 潜江 433124) |
|
| 摘要: |
| 笔者建立了中扬子区寒武系层序地层格架,研究了中扬子区层序界面和体系域特点,分析了中扬子区层序样式的基本类型及其特征。共划分出2个二级层序、14个三级层序。寒武系下统划分了1个二级层序(SS3)、6个三级层序(SQ1-SQ6),平均延时约5.0Ma;体系域颜色普遍较深,泥质含量较高,是一套良好的烃源岩。寒武系中上统划分出1个二级层序(SS4)、8个三级层序(SQ7-SQ14),平均延时约2.9Ma;体系域颜色普遍较浅,云质含量较高,是一套良好的储集层。总体上H型样式为主,T型样式和TH型样式数量相当,反映寒武纪水体中等。二级层序体系域和三级层序体系域都表现出明显的南北向差异性。 |
| 关键词: 层序地层 层序样式 寒武纪 海相沉积 中扬子区 |
| DOI： |
| 附件 |
| 投稿时间：2003-03-03 |
| 基金项目: |
|
| Cambrian sequence stratigraphy of the middle Yangtze area |
| ZHOU Yan, CHEN Hong-de, WANG Cheng-shan, JIN Zhi-jun, TANG Liang-jie, WANG Zheng-yuan, LIANG Xi-wen |
(1. Faculty of Resources and Environments, University of Petroleum, Beijing 102200, China;
2. Chengdu University of Technology, Chengdu 610059, Sichuan, China;
3. Jianghan Oil Field Branch, SINOPEC, Qianjiang 433124, Hubei, China) |
| Abstract: |
| The present paper deals with the Cambrian sequence stratigraphic framework, sequence boundaries, sequence patterns and systems tracts, in the middle Yangtze area. Two second-order sequences and fourteen third-order sequences have been distinguished, including:(1) one second-order sequence (SS3) and six third-order sequences (SQ1-SQ6) for the Lower Cambrian strata, with an average time duration of about 5.0 Ma. The systems tracts are generally dark-coloured, with higher mud contents, and thus may serve as excellent source rocks, and (2) one second-order sequence (SS4) and eight third-order sequences (SQ7-SQ14) for the Middle and Upper Cambrian strata, with an average time duration of about 2.9 Ma. The systems tracts are generally light-coloured, with higher dolomite contents, and thus may serve as excellent reservoir rocks. Collectively, the H-type patterns are dominated; the T-type and TH-type are almost identical, indicating a moderate water depth during the Cambrian. The NS-directed differences are manifested in both second- and third-order systems tracts. |
| Key words: sequence stratigraphy sequence pattern Cambrian marine sediments middle Yangtze area |