北羌塘盆地中侏罗统布曲组缓坡相及沉积演化  

Carbonate ramp facies and sedimentary evolution of Middle Jurassic Buqu Formation in northern Qiangtang Basin

作　　者：夏国清[1] 伊海生[1] 黄华谷[1] 李军鹏[1] 

机构地区：[1]成都理工大学沉积地质研究院

出　　处：《岩性油气藏》2009年第2期29-34,共6页Lithologic Reservoirs

基　　金：国家自然科学基金项目(编号:40572077);教育部博士点基金项目(编号:20060616005)

摘　　要：针对北羌塘盆地布曲组沉积环境的不同认识,根据羌塘盆地形成的地质构造背景、古地貌特征,以及布曲组地层的沉积特征,确证布曲组沉积环境属缓坡沉积。在此基础上,对布曲组标准剖面野外露头进行详细观察与描述,并根据剖面岩相及其组合特征,识别出内缓坡、中缓坡、外缓坡3种沉积亚相,包括潮坪、泻湖、浅滩等7种微相。由此建立了该时期的沉积相序及其演化。Different viewpoints have been proposed about the sedimentary environment of Jurassic Buqu Formation in northern Qiangtang Basin. Based on the geological settings, paleogeomorphological features and the sedimentary characteristics of Buqu Formation in Qiangtang Basin, it is confirmed that Buqu Formation belongs to carbonate ramp sedimentation. Based on outcrop observation and description, combined with lithofacies analysis, the ramp is divided into three kinds of subfaeies, including inner ramp, mid-ramp and outer-ramp, and seven kinds of microfacies, such as tidal fiat, lagoon and shallow shoal etc. The sedimentary facies sequences and evolution of this period are established.

关 键 词：碳酸盐缓坡 沉积相 环境演化 布曲组 北羌塘盆地 

分 类 号：TE121-3[石油与天然气工程—油气勘探]