中国东南屯溪-温州宽角地震资料去广角效应成像  

Imaging of seismic data from TunXi to WenZhou by removing wide angle effect in Southeast China

作　　者：张智[1] 董超[1] 李飞[2] 王海燕[2] 

机构地区：[1]广西隐伏金属矿产勘查重点实验室,桂林理工大学地球科学学院,桂林541004 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《地球物理学进展》2013年第3期1183-1191,共9页Progress in Geophysics

基　　金：国家自然科学基金(41274070,40804017,41021063,41074033,40974025);国家科技专项项目(SinoProbe 02-02-02);广西自然科学基金(2013GXNSFAA019271)联合资助

摘　　要：由于长排列广角地震采集中必定存在超临界角的广角反射信息,广角反射信息相对临界角内反射信息存在随偏移距变化的时移现象.本文研究了去广角效应下的走时反演成像,并将其应用到东南屯溪—温州的宽角地震资料.通过拾取中国东南屯溪—温州剖面宽角实际地震资料中P波垂直分量拾取到的反射P波走时,继而使用遗传反演方法进行处理,得到了该区丰乐、新安江、松阳、青田以及洞头五炮去广角效应与未考虑广角效应情况下的一维速度深度曲线,并对比了去广角效应前后的地壳结构界面形态.结果表明,广角效应去除前后影响主要体现在壳内层速度差异,地壳浅层界面深度的广角效应明显强于深层界面.The supercritical angle wide-angle reflection information must exist in the tong arrangement oi wine-angle seismic acquisition, wide angle reflection information exists variation with offset time shift phenomenon relative to the critical angle internal reflection information- We studied seismic travel time inversion imaging under the effect of wide angle, and its application to the southeast of Tunxi-Wenzhou wide angle seismic data in this paper. By picking up the travel time of p wave vertical component of the section from Tunxi to Wenzhou in Chinese southeast region, and processed the data by genetic inversion method, we get one-dimensional velocity depth curve of five source points including Feng-le, Xin-an river, Song-yang, Qing-tian and Dongtou under the condition of taking into account and no the wide angle effect, and compared to crustal structure and interface formation under two conditions. The resuks show that wide angle effect is mainly reflected speed and interface depth in the crustal inner before and after removing the impact, the shallow crust interface depth wide angle effect was stronger than the deep interface.

关 键 词：时移 屯溪-温州剖面 走时反演 遗传算法 广角效应 

分 类 号：P315[天文地球—地震学]