摘要
运用盒子波技术对羌塘盆地托拉木—笙根地区的干扰波进行了调查。抽取共接收点道集发现相应的干扰波;通过时窗切片、雷达图像扫描分析,准确获得了干扰波的速度、传播方向、相对能量及信噪比信息。该区除背景干扰外,还发育四种面波散射、两种线性干扰、一种多次折射波和一种折射波。利用盒子波技术中的面积型排列进行了检波器组合基距压制干扰,结果表明:单点接收无法对干扰波进行压制;40m组合基距能够压制部分背景干扰;120m组合基距能够压制部分面波散射;160m组合基距对背景和面波散射干扰压制效果较好,但对压制速度较高的线性干扰、多次折射波和折射波效果不明显。
This paper discusses noise investigation by box wave method in Tuolamu-Shenggen area, Qiangtang Basin.Different kinds of noises can be found on Common receiver gathers.Using time slice and radar image scanning analysis,noise velocity,its propagation direction and its relative energy on the raw records can be obtained along with signal-noise ratio.Apart from ambient noise,we have found also four kinds of ground rolls,two kinds of linear noise,multi-refraction and refraction wave in this area.Meantime the results of suppressing noises by different geophone array lengths are analyzed and compared on the basis of areal analysis of box wave. The following conclusions can be drawn:A.The noises cannot be suppressed when geophone array length is zero;B.The ambient noises can be partly suppressed when geophone array length is 40 meters;C.The ground rolls can be primarily suppressed when geophone array length is 120meters;D.Both the ambient noises and ground rolls can be suppressed much better when geophone array length is 160meters;E.But for linear noise,multi-refraction and refraction wave, good suppressed results cannot be obtained even when geophone array length is 160meters.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2013年第A01期1-6,共6页
Oil Geophysical Prospecting
基金
中国地质调查局青藏矿产专项"羌塘盆地油气勘探目标优选与科探井井位预研究"(资[2008]青藏15-01)
中国地质调查局青藏油气项目"羌塘盆地及其外围重点盆地油气远景调查"(资[2011]02-03-01)
"青藏高原二维地震勘探方法攻关及重点盆地结构调查"(资[2012]03-004-006)
国家自然科学基金项目(40972087)联合资助
关键词
羌塘盆地
盒子波技术
干扰波
信噪比
检波器组合基距
Qiangtang Basin,box wave technique,noise,signal-to-noise ratio,geophone array length
