中国西北地区岩石层瑞利波三维速度结构与沉积盆地  

THE 3-D STRUCTURE OF RAYLEIGH WAVE AND SEDIMENTARY BASINS IN NORTHWEST CHINA

作　　者：滕吉文[1] 胡家富[1] 张中杰[1] 王爱武[1] 孙小丽[1] 杨占寿[1] 杨顶辉[1] 万志超[1] 

机构地区：[1]中国科学院地球物理研究所,云南大学计算中心,北京林业大学计算中心

出　　处：《地球物理学报》1995年第6期737-749,共13页Chinese Journal of Geophysics

基　　金：中国科学院动力大地测量开放实验室资助

摘　　要：研究了中、新生界沉积层所覆盖的我国西北各沉积盆地：准噶尔盆地、塔里木盆地、柴达木盆地，以及一系列中小型盆地和其邻近地域的深部岩石层三维速度结构，探讨其和造山带与油气田的关系．使用了适配滤波频时分析方法，分析了我国数字台网的中长周期瑞利面波资料，计算得到２５７条混合路径的面波群速度频散．利用改进的分格随机反演理论与方法，从混合路径中提取了１００条频散突出路径的４°×４°网格单元的纯路径频散，并反演研究区的三维Ｓ波速度结构．频散的周期从１．９５ｓ到１５１．７ｓ，浅部分辨率可达１ｋｍ，得出了该区深达２００ｋｍ范围内三维瑞利波群速度的分布与特征．所得结果表明：塔里木盆地、哈密－吐鲁番盆地、伊宁盆地以及藏北地区的羌塘盆地具有较好的油气前景．我国西北邻国接壤地带，也均为良好的油气盆地潜在地带．In this paper,Rayleigh wave dispersion data of 100 selected paths crossing Northwestern China determined by applying,the MF-FTAN technique to CDSN Intermediate period data.The technique(matched- filter reqiemcu-time analysis)improves the resolution of dispersion measurement over a broader period range with reduced systemastic errors.An improved grid dispersion inversion is proposed to extract purepath disperesion curves in each 4°×4°grid from the mixed-path dispersion data for a more extensive study. This periods of dispersion in the range of 1.95 to 151.7s have obtained. On the basis of the grid dispersion inversion,we use Harkrider surface wave inversion program to inverse for the three dimensional shear wave velocity structure to a depth 200km.The results indicate that,the Tarim basin,Jungar basim,Chaidam basin and three small basins(Turfan, Harmi and Yining basins)are all latent promising region for the exploration and exploitation of the oil and gas.Meanwhile,the east margin of Kazakhstan(from Aadizan basin to Balchas lake) and the west margin of Mongolia(from Dalan Dzadgad to Chovd)neighboring our Xingjiang are both latentarea with perspective for oil and gas prospecting and exploiting.

关 键 词：岩石 瑞利波 速度结构 沉积盆地 油气地质 

分 类 号：P584[天文地球—岩石学] P618.130.2[天文地球—地质学]