塔里木盆地寒武—奥陶纪海平面升降变化规律研究  

Study on Eustatic Sea-Level Change Rule in Cambrian-Ordovician in Tarim Basin

作　　者：高志前[1] 樊太亮[1] 李岩[2] 刘武宏[3] 陈玉林[4] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]北京市地质研究所,北京100011 [3]中国石化胜利油田有限公司纯梁采油厂,山东东营256504 [4]中国石油大港油田公司第五采油厂,天津434023

出　　处：《吉林大学学报（地球科学版）》2006年第4期549-556,共8页Journal of Jilin University：Earth Science Edition

基　　金：中国石化西部新区勘探指挥部科技攻关项目(XBKT2002KY08041)

摘　　要：利用元素地球化学特征和地震几何构型特征,对塔里木盆地寒武-奥陶纪时期海平面升降变化规律进行了研究,建立了寒武-奥陶纪相对海平面变化曲线。研究发现,塔里木盆地寒武奥陶纪可划分出3个一级旋回,8个二级旋回,17个三级旋回和多期高频震荡旋回。其中,寒武纪经历了3期二级旋回,早中奥陶世经历了2期旋回。相对于寒武纪,早奥陶世海平面升幅较大。晚奥陶世经历了3期二级旋回:第一期处于海平面低位期,幅度较小;后二期快速上升,直达最高水位状态。海平面相对升降变化控制着盆地的沉积充填和层序的形成演化,其旋回性与盆地沉积作用的旋回性相一致,并可通过沉积相的演变表现出来。The eustatic sea-level change rule has been studied by using element geochemistry feature and seismic geometric configuration feature in the Cambrian-Ordovician in Tarim Basin, and the comparative sea-level change curve has been obtained, which can be divided into three first-grad.e cycles, eight second-grade cycles, seventeen third-grade cycles and more high frequency concussion cycles in the Cambrian-Ordovician in Tarim Basin. There occurred the second-grade eustatic sea-level change cycle three times during Cambrian and two times during the early Ordovician, and the extent of the sea-level rise in the early Ordovician is higher than that in Cambrian. In the middle-late Ordovician there occurred the second-grade eustatic sea-level change cycle three times, and the first time occurred at low system tract of sea level with small rise extent of the sea-level, but the sea-level rapidly reached the highest water level state in the later two times. The eustatic sea-level change controls on the basin sediment infilling and sequence formation evolution. The cyclicity of the sea-level changes are corresponded with the cyclicity of the basin sedimentation, and are represented by the sedimentary facies evolutions.

关 键 词：塔里木盆地 层序叠加 高频旋回 寒武-奥陶纪 海平面变化 

分 类 号：P535.245[天文地球—古生物学与地层学]