塔里木盆地志留系高分辨率层序地层格架研究

以高分辨率层序地层学理论为指导,对塔里木盆地志留系进行高分辨率层序地层学分析,总结出各层序地层单元及其界面在露头、岩心、测井和地震资料中的判识标志,识别出研究区短期、中期和长期3个级别的基准面旋回层序。在研究区内短期旋回层序可划分为向上“变深”非对称型和向上“变浅”非对称型2种基本结构类型。通过柯坪地区露头剖面与全区钻井剖面进行对比,结合塔中地区层序地层划分,将全盆地划分出了4个长期基准面旋回层序,建立了全区高分辨率层序地层格架,为塔里木盆地志留系进一步的等时追踪对比、砂体几何形态、沉积相研究和储层结构描述等精细地质研究奠定了基础。

A Study of High-Resolution Sequence Stratigraphic Framework of the Silurian Period in the Tarim Basin

Based on the high-resolution sequence stratigraphic theory,by the observing of outcrops,the describing of cores and the analyzing of well log data,the authors summarize the marks of stratigraphic classification,divide the base-level cycle of the Silurian period from the Tarim Basin into three orders. The short-term,middle-term and long-term base-level cycles.Among them,the short-term base-level can be divided into two basic structure types,which are of up-deepening non-symmetry and up-shallowening non-symmetry,respectively.The Kalpintag formation has been divided into four middle-term base-level cycles in Tazhong Areas,respectively.On the basis of sequence stratigraphic classification in Tazhong Areas,the paper seeks to establish the stratigraphic framework of the Silurian period in the Tarim Basin by contrasting the outcrops of the Kalpin Area with the log section of the entire Tarim Basin,Laying a solid foundation for tracing correlation to the sand bodies,sedimentary facies,meticulous describing of the reservoirs structure of the Silurian period in the Tarim Basin.