首页 | 本学科首页   官方微博 | 高级检索  
     检索      

鄂尔多斯盆地上地壳速度分布与沉积建造和结晶基底起伏的构造研究
引用本文:滕吉文,王夫运,赵文智,赵金仁,李明,田小波,闫雅芬,张永谦,张成科,段永红,杨卓欣,徐朝繁.鄂尔多斯盆地上地壳速度分布与沉积建造和结晶基底起伏的构造研究[J].地球物理学报,2008,51(6):1753-1766.
作者姓名:滕吉文  王夫运  赵文智  赵金仁  李明  田小波  闫雅芬  张永谦  张成科  段永红  杨卓欣  徐朝繁
作者单位:1.中国科学院地质与地球物理研究所,北京 100029;2.中国地震局地球物理勘探中心,郑州 450002;3.中国石油勘探开发研究院,北京 100083
基金项目:中国科学院知识创新工程重要方向项目 , 国家自然科学基金重点项目 , 面上基金共同资助项目  
摘    要:基于在鄂尔多斯盆地与其北部造山带地域,即沿延川—包头—满都拉地带进行的地震宽角反射和折射波场探测,取得了高分辨率的Pg波震相.通过走时差分层析成像方法进行Pg波波场走时反演,给出了沿剖面辖区的上地壳速度分布,求得了沉积建造和结晶基底折射界面的起伏变化,并给予了解释.研究结果表明,鄂尔多斯盆地上地壳为双层结构,上下层之间存在明显的折射界面,上层速度低,纵向变化梯度大;下层速度高,变化较为均匀.基于沿剖面辖区上地壳的速度分布特征提出自南向北应分为:榆林南凹陷、榆林—刀兔隆起、刀兔北至鄂尔多斯北缘断裂为箕形凹陷及其内部的次级构造、呼包凹陷以及伴随的断裂等沉积建造和结晶基底的起伏变化.阴山造山带上地壳速度明显比两侧地区高,速度呈纵向条带状展布,故呈现出结晶基底结构的分布特征和乌拉山、色尔腾山、和教岩体及白云鄂博群陆壳拼合及增生现象.内蒙造山带上地壳亦为双层结构,但基底折射界面不如鄂尔多斯块体明显.本文基于对该区沉积建造和结晶基底的起伏,讨论了沿剖面各有关凹陷的沉积特征与油气前景.

关 键 词:2008-07-13鄂尔多斯盆地  速度分布  沉积建造  结晶基底  油气前景  
收稿时间:2007-11-27
修稿时间:2008-7-13

Velocity distribution of upper crust, undulation of sedimentary formation and crystalline basement beneath the Ordos basin in North China
TENG Ji-Wen,WANG Fu-Yun,ZHAO Wen-Zhi,ZHAO Jin-Ren,LI Ming,TIAN Xiao-Bo,YAN Ya-Fen,ZHANG Yong-Qian,ZHANG Cheng-Ke,DUAN Yong-Hong,YANG Zhuo-Xin,XU Chao-Fan.Velocity distribution of upper crust, undulation of sedimentary formation and crystalline basement beneath the Ordos basin in North China[J].Chinese Journal of Geophysics,2008,51(6):1753-1766.
Authors:TENG Ji-Wen  WANG Fu-Yun  ZHAO Wen-Zhi  ZHAO Jin-Ren  LI Ming  TIAN Xiao-Bo  YAN Ya-Fen  ZHANG Yong-Qian  ZHANG Cheng-Ke  DUAN Yong-Hong  YANG Zhuo-Xin  XU Chao-Fan
Institution:1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2.Geophysical Exploration Center, China Earthquace Administration, Zhengzhou 450002, China;3.Research Institute of Petroleum Exploration and Development, Beijing 100083, China
Abstract:Along the line Yanchuan-Baotou-Mandela in the Ordos basin and adjacent Yinshan mountainous area in the north China,a wide-angle reflection and refraction seismic sounding has been carried out yielding Pg wave data of high resolution.By the traveltime differential tomographic imaging,traveltime inversion of the Pg wave field is performed to determine velovity distribution of the upper crust,and undulation of sedimentary formation and crystalline basement along the profile.And geological interpretation to these features is made.The result shows that the upper crust below the Ordos basin is of a double-layer structure,with a distinct interface between the upper and lower layer.The upper layer is characterized by low velocity and big gradients in vertical direction,while the lower layer has high velocity and changes gently.In the light of the velocity distribution in the upper crust of the study area,it is suggested that the sedimentary formation and crystalline basement undulate in NS direction,generating a series of rising and falling structures.From south to north,they are the depression south to Yulin,Yulin-Daotu swell,listric depression from northern Daotu to the fault on the northern edge of Ordos and secondary structure in it,and Hohhot-Baotou depression and its interior faults.In the north,seismic wave velocity in the upper crust beneath the Yinshan Mountains(Mt.) is obviously higher than that below the areas on the both sides,exhibiting a pattern of longitudinal belt.It reflects the feature of the crystalline basement of this area,which is associated with collage and accretion of several blocks such as the Wula'er shan Mt.,Se'erteng double-layer structure,though its refraction interface of the basement is not so clear as that below the Ordos basin.Based on the structures of sedimentary formation and undulation of the crystalline basement of the study area,we have discussed the sedimentary features and hydrocarbon prospects of every depression along the profile.
Keywords:Ordos basin  Velocity distribution  Sedimentary formation  Crystallizine basement  Hydrocarbon
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《地球物理学报》浏览原始摘要信息
点击此处可从《地球物理学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号