塔里木盆地巴楚隆起寒武系层序及岩相古地理  

The Cambrian Sequence and Lithofacies Paleogeography in Bachu Uplift in Tarim Basin

作　　者：祝贺[1,2] 刘家铎[1,2] 孟万斌[1] 杨永剑[2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [2]成都理工大学沉积地质研究院,成都610059

出　　处：《新疆石油地质》2010年第4期344-348,共5页Xinjiang Petroleum Geology

摘　　要：分析沉积相和层序界面识别后,将巴楚隆起区寒武系划分为2个二级层序(SS1和SS2)及14个三级层序。每个二级层序又分为海侵体系域(TST)和高位体系域(HST)。研究表明,SS1-TST发育时期,区内地壳下降,相对海平面快速上升,本区接受一套深水盆地相沉积;SS1-HST发育时期,受海平面大幅度下降、水循环受限和干旱炎热气候影响,区域沉积格局由盆地直接向局限台地转化,最终进入频繁暴露的蒸发台地环境,以沉积膏云岩和膏岩为主,形成一套重要的区域性致密盖层;SS2发育时期,又经历了一次大规模的海平面升降旋回,形成开阔台地-局限台地-开阔台地相带的展布格局。Based on the sequence interface identification and sedimentary facies analysis, the Cambrian in Buchu uplift in Tarim basin can be divided into 2 second-order sequences （SS1 and SS2） and 14 third-order sequences. Each second-order sequence consists of transgressive system tract （TST） and highstand system tract （HTS）. It is indicated that during the development of SS1-TST, a set of deepwater basin-facies deposit develops in this area with crust subsidence, relative sea-level quick raising; during the development of SS1-HST, the regional sedimentary framework transforms from basin to restricted platform and finally enters into open and evaporating environment influenced by lowing sea level, restricted water cycle and dry-hot climate, dominated by gypsodolomite and gypsite. Thus a set of important regional dense cap rocks is formed; as the development of SS2, a large scale of sea-level ascending-descending cycle occurs, as a result a framework of open platform-restricted platform-open platform is shaped.

关 键 词：巴楚隆起 寒武系 层序-岩相古地理 盖层 

分 类 号：P534.46[天文地球—古生物学与地层学] P531[天文地球—地质学]