中扬子区寒武纪层序地层研究  

Cambrian sequence stratigraphy of the middle Yangtze area

作　　者：周雁[1] 陈洪德[2] 王成善[2] 金之钧[1] 汤良杰[1] 王正元[3] 梁西文[3] 

机构地区：[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

出　　处：《沉积与特提斯地质》2003年第3期65-72,共8页Sedimentary Geology and Tethyan Geology

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。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.

关 键 词：层序地层 层序样式 寒武纪 海相沉积 中扬子区 

分 类 号：P534.41[天文地球—古生物学与地层学]