藏北羌塘盆地反射地震剖面与叠加速度研究  

A study of seismic reflection profiles and stack velocities in Qiangtang basin,northern Tibet

作　　者：卢占武[1] 高锐[1] 李秋生[1] 匡朝阳[1,2] 刘金凯[1,2] 李朋武[1] 管烨[1] 贺日政[1] 王海燕[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国石化集团华东石油局第六物探大队,江苏南京210007

出　　处：《中国地质》2009年第3期677-681,共5页Geology in China

基　　金：科技部国际合作重点项目(2006DFA21340);国土资源部青藏高原油气专项(XQ2004-06);地下信息探测技术与仪器教育部重点实验室(中国地质大学;北京)开放课题项目(GDL0603);国家深部探专项(Sinoprobe-02)资助

摘　　要：本文主要阐述藏北羌塘盆地龙尾错区块的二维反射地震试验的数据采集和处理的过程。分析两条剖面的反射特征,并对叠加剖面进行了初步解释:羌塘盆地中央隆起北侧存在大规模的深凹陷构造;盆地浅部不同方向的构造变形存在较大差异;出现较强的基底反射特征;中生代、古生代地层的反射特征差异较大。文中尝试对数据处理过程中的叠加速度变化进行研究,获得了与叠加剖面较一致的结果,并进一步对某探井的构造背景提出见解。This paper deals with the test conducted along two 2-D seismic reflection profiles in Longweicuo area of north Qiangtang basin, Tibet. Flows and parameters of seismic data acquisition and processing are discussed, and the main characteristics of the two profiles are interpreted tentatively. Some conclusions have been reached： there is a large-sized deep depression on the north wedge of the central uplift in Qiangtang basin; there exist obviously different reflections of structural deformation in different directions, with the basement showing strong reflections and Paleozoic strata displaying weak reflections; there also exist apparent differences between Mesozoic strata and Paleozoic strata. The authors studied stack velocity fi：om data-processing and obtained a result consistent with the stack seismic data. Furthermore, some opinions were put forward on the structural background of a drilling hole arranged near one of the seismic profiles.

关 键 词：西藏 羌塘盆地 反射地震剖面 试验 叠加速度 初步解释 

分 类 号：P631.44[天文地球—地质矿产勘探]