塔里木盆地寒武纪层序岩相古地理特征  

Sequence Lithofacies Paleogeography of Cambrian in Tarim Basin

作　　者：杨永剑[1] 刘家铎[1] 田景春[1] 孟万斌[1] 张翔[1] 祝贺[1] 

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,四川成都610059

出　　处：《天然气地球科学》2011年第3期450-459,共10页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2008ZX05002-003)资助

摘　　要：通过野外露头剖面、测井和录井、地震等资料,以层序地层学理论为指导将塔里木盆地寒武系划分为3个二级层序(SS1,SS2,SS3),14个三级层序,其中二级层序均为I型层序,主要发育海侵体系域和高位体系域。在此基础上结合其沉积相发育特征以二级层序体系域为编图单位编制了6张层序岩相古地理图。结果表明,SS1、SS2时期均表现为海侵期急速而短暂的海平面上升与高位期漫长的缓慢海平面下降,盆地中部、西部区域主要以海侵期的局限台地、开阔台地沉积转变为高位期的蒸发台地及局限台地泻湖沉积,盆地东部区域主要以陆棚、盆地沉积为主,盆地面积相对较大。SS3时期盆地中部、西部地区主要以局限台地、开阔台地沉积为主,与SS1、SS2时期不同的是SS3时期盆地沉积区域相对缩小,陆棚沉积区域扩大,在SS3高位期,盆地最东端逐渐转变为碳酸盐台地沉积。Based on the materials of outcrops,wells data and seismic data,and guided with sequence stratigraphy theory,the sequence stratigraphy of Cambrian in Tarim basin is divided into three second-order sequences（SS1,SS2,SS3） which belong to the typeⅡsequence,developing TST and HST,and fourteen third-order sequences.Combined with the characteristics of sedimentary facies,six sequence-based lithofacies paleogeographic maps of Cambrian are compiled with the mapping units of sedimentary system tracts.The result shows a rapid and short-term sea level rise in TST and a long slow sea level decline in HST during deposition ages of both SS1 and SS2.The depositions in the middle and western regions of Tarim basin changed from restricted platform and open platform deposition in TST to evaporation platform and restricted platform lagoon in HST.The eastern region of Tarim basin accepted the shelf and basin filling.at this time,the whole basin area was relatively large.In the SS3 period,the platform and open platform deposition existed in the middle and western regions of Tarim basin,In comparison with the SS1 and SS2,the deposition areas became small,and the shelf deposit area expanded.The deposition environment in the eastern part of basin gradually turned to carbonate platform in the SS3 HST.

关 键 词：塔里木盆地 寒武纪 层序 岩相古地理 

分 类 号：TE121.34[石油与天然气工程—油气勘探]