数字检波器在塔北地区高分辨地震采集中的对比分析  

The Comparison and Analysis of Digital Geophone in High Resolution Seismic Acquisition in Tabei Area

作　　者：张新东[1] 韩波[1] 

机构地区：[1]中国石油塔里木油田分公司勘探事业部

出　　处：《岩性油气藏》2010年第F07期175-178,共4页Lithologic Reservoirs

摘　　要：塔里木盆地塔北地区由于目的层埋藏深．使用常规提高分辨率的勘探手段不能见效。对数字检波器采集的资料进行分析，发现浅层原始资料主频能够得到较大提高，同时目的层反射高频也得到增强，但分析认为目的层增强的高频能量主要为高频随机噪声。在进行频率扫描时无法获得深层弱反射信号。数字检波器高动态范围、高频特征相位曲线平直的特性没有得到有效应用，无法达到提高目的层分辨率的目的。常规磁钢检波器虽然瞬间动态范围小于数字检波器。但其有弱信号灵敏度高的特点。采用适当的检波器组合，压制高频随机干扰，同时采用适当的激发能量，使深层高频弱反射信号在检波器瞬间动态范围窗口内得到增强。对比分析发现，使用常规检波器能够接收到深层高频弱反射信号，可增强本区反射信号的主频．Due to large depth of target formation in northern Tarim Basin, conventional exploration approaches that enhance resolution cannot acquire good results. Analysis adopted data acquired by digital geophone. It was found that the main frequency of raw data in the shallow layers had been greatly enhanced. However, although the high frequency of reflection wave of target formation has been enhanced, yet it was regarded mainly as random noise of high frequency after analysis. During frequency scanning, weak reflection signal in deep formation could not be seen. High dynamic scope and feature straight phase curve features of high frequency of digital geophone are not used effectively. Thus, the resolution of target formation cannot be enhanced. Although the instantaneous dynamic scope of conventional magnet steel geophone is smaller than that of digital geophone, yet it has strong sensitivity of weak signal. If proper geophones are combined to reduce radom noise of high frequency while proper activation energy is used, the weak reflection signal of high frequency in the deep formation can be shifted into the instantaneous dynamic window of geophone. Conventional geophone can receive weak reflection signal in the deep formation, which can increase the main frequency of the reflection signal.

关 键 词：数字检波器 分辨率 组合 塔里木盆地 

分 类 号：P631.436[天文地球—地质矿产勘探]