| 摘要: |
| 沉积相研究是进行含油气盆地勘探、评价的一项重要的基础工作。笔者根据在西藏尼玛县军仓乡拉加当实测剖面中所获得的资料,分析了下二叠统昂杰组的岩性特性、沉积相类型、剖面的垂向沉积演化和区域沉积特征。该组主要为一套砂岩-泥岩的暗色碎屑岩系,属冈瓦纳石炭纪一二叠纪冰川末期的边缘海沉积。其沉积类型既有冈瓦纳大陆稳定沉积的特点,又有滨岸条件下的低能沉积特征,主要为一套潮坪沉积组合,其沉积环境与短周期小规模近岸冰川活动有关。 |
| 关键词: 西藏 下二叠统 昂杰组 沉积相 |
| DOI： |
| 附件 |
| 投稿时间：1999-03-15 |
| 基金项目: |
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| Sedimentary facies of the Lower Permian Ngangze Formation in the Coqen Basin,Xizang |
| WANG Shao-lan, WANG Guan-min, CHEN Qing-hua |
| (Department of Mineral Resources, University of Petroleum, Dongying 257062, China) |
| Abstract: |
| The sedimentary facies analysis is an important basic research in the petroleum exploration and assessment.The present paper presents a description of lithology,sedimentary fades,vertical evolution and regional deposition on the basis of the data obtained from the Lajiadang section in Gyungcang,Nyima,Xizang.The formation is dominated by a suite of dark clastic rock series consisting of sandstones and mudstones which are ascribed to the Carboniferous-Permian glacial marginal sea sediments on Gondwana land,and characteristic of both continental stable sediments and littoral low-energy sediments.The depositional environments are related to short-period small-scale nearshore glacial activity. |
| Key words: Xizang Lower Permian Ngangze Formation sedimentary fades |
