西藏地区措勤盆地下二叠统昂杰组沉积相分析

SEDIMENTARY FACIES ANALYSIS ON THE LOWER PERMIAN ANGJIE FORMATION OF THE CUOQIN BASIN IN TIBET AREA

王绍兰 王冠民 陈清华

WANG Shao-lan WANG Guan-min CHEN Qing-hua

石油大学资源系, 山东东营257062

Department of Petroleum Resource Sciences, University of Petroleum, Dongying, Shandong 257062, China

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。本文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-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。

The research of sedimentary facies is an important foundational work for the exploration and evaluation of petroliferous basins. According to data obtained from measured sections in Lajiadang, Juncang town, Nima county, Tibet, the lithological features, the types of sedimentary facies, the vertical sedimentary evolution of sections and the regional sedimentary characteristics of the Lower Permian Angjie Formation are analyzed in this paper. This formation is dominated by a set of sandstone-mudstone dark clastic rock series which belongs to marginal marine deposit at the end of the Gondwana Carboniferous-Permian glacier period. Its sedimentary type has the characteristics of both the stable deposit of Gondwana continent and the low energy deposit under coastal conditions, and mainly consists of a set of tidal-flat sedimentary assemblage whose sedimentary environment is related to short-period and small-scale inshore glacier activities.

中国石油天然气集团公司新区勘探攻关项目(CQ97YD202)

https://doi.org/10.11781/sysydz199903215