组合多次波压制技术在陆丰凹陷陡坡带的应用  

Application of Combined Multiple Suppression Technologyin Steep Slope Zone of Lufeng Sag

作　　者：张明 肖张波 张志伟 易浩 贾连凯 Zhang Ming;Xiao Zhangbo;Zhang Zhiwei;Yi Hao;Jia Liankai(Shenzhen Branch,CNOOC China Limited,Shenzhen Guangzhou 518000,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518000

出　　处：《工程地球物理学报》2023年第2期246-252,共7页Chinese Journal of Engineering Geophysics

基　　金：“十四五”国家科技重大项目(编号:KJGG2022-0403)。

摘　　要：南海北部珠江口盆地陆丰凹陷陡坡带高速灰岩分布广泛,强烈速度差异造成的强反射系数界面极易形成多次波,严重影响了地震资料中深层信噪比和斜坡带、扇体等地质体的成像效果,给后续的解释工作造成了一定的困难。本地区多次波能量强、类型复杂,运用常规的多次波压制方法很难较好地进行压制。因此提出使用组合多次波压制技术,首先采用DWD方法压制短周期海底多次波,然后使用SRME方法压制与海底无关的长周期多次波,接着使用ISIMP技术针对性地处理层间多次波,最后运用高精度拉东变换压制剩余的多次波。处理结果表明,DWD+SRME+ISIMP+高精度拉东变换的组合多次波压制技术能很好地压制陆丰凹陷陡坡带的复杂多次波,有效地提高了中深层的信噪比和成像质量。High speed limestone is widely distributed in the steep slope zone of Lufeng sag in the northern Pearl River Mouth Basin of the South China Sea.The strong reflection coefficient interface caused by strong velocity difference is very easy to form multiple waves,which seriously affects the imaging effect of seismic data in the middle and deep layers,and geological bodies such as slope zones and fans tend to cause certain difficulties for subsequent interpretation.Due to the strong energy and complex multiples types in this area,it is difficult to suppress multiples well by using conventional multiple suppression methods.Therefore,a combined multiple suppression technique is proposed.Firstly,DWD method is used to suppress short period seafloor multiples,Seccondly,SRME method is used to suppress long period multiples unrelated to seafloor.Thirdly,ISIMP technology is used to process interlayer multiples.Finally high-precision Radon transform is used to suppress the remaining multiples.The processing results show that the combined multiple suppression technology of DWD+SRME+ISIMP+high-precision Radon transform can well suppress the complex multiples in the steep slope zone of Lufeng depression,and effectively improve the signal-to-noise ratio and imaging quality in the middle and deep layers.

关 键 词：高速灰岩 多次波 DWD SRME ISIMP 高精度拉东变换 

分 类 号：P631.4[天文地球—地质矿产勘探]