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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。
Sedimentary facies research is an important basic work for exploration and evaluation of oil and gas-bearing basins. Based on the data obtained from the actual measured section of Lagarde at Nangang County, Nima County, Tibet, the lithological characteristics, types of sedimentary facies, vertical sedimentary evolution and regional sedimentary features of the Lower Permian Angang Formation are analyzed. This group is mainly a set of dark clastic rocks of sandstone-mudstone, which is deposited in the marginal sea at the end of the Gondwana Carboniferous-Permian glacier. The sedimentary types are both stable sedimentary characteristics of the Gondwanaland and low-energy sedimentary features in the coastal area. They are mainly a tidal flat sedimentary assemblage whose depositional environment is related to short-period small-scale offshore glacier activities.