海洋单阶次表面多次波分离方法研究  

Separation of Single Order Marine Surface-related Multiples

作　　者：叶月明 任浩然[2] 徐志诚 李立胜 王力宝 杨存 YE Yueming;REN Haoran;XU Zhicheng;LI Lisheng;WANG Libao;YANG Cun(PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;School of Earth Science,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]中国石油杭州地质研究院,杭州310023 [2]浙江大学地球科学学院,杭州310027

出　　处：《CT理论与应用研究（中英文）》2021年第2期139-147,共9页Computerized Tomography Theory and Applications

基　　金：国家自然科学基金(41874164);国家科技重大专项(2017ZX05026-006)。

摘　　要：海洋地震资料普遍发育强能量表面多次波,传统表面多次波压制技术(SRME)能够预测出所有阶次表面多次波,但是各阶次表面多次波相互混叠。为了能够单独利用不同阶次的表面多次波成像,降低干涉假象对多次波成像的影响,需要将不同阶次的表面多次波分离出来。本文提出一种基于扩展SRME的海洋单阶次表面多次波分离方法。首先,应用SRME技术预测出混叠的所有表面多次波;其次,修改常规SRME技术的边界输入条件,将上一步求得的所有多次波进行升阶次处理;再次,预测出混叠的所有表面多次波与其升阶次后的表面多次波匹配相减求得单阶次多次波。以此类推,能够逐步分离出不同阶次的表面多次波。数值模型和某深海实际资料测试表明本方法的有效性,不同阶次表面多次波被有效分离,为后期多次波的利用奠定了基础。High energy surface multiples are commonly developed in marine seismic data.Traditional surface multiples suppression(SRME)can predict all order surface multiples,but surface multiples were stack together.In order to utilize different order surface multiple independently to image subsurface structure and reduce the influence of interference,it is necessary to separate different order surface multiples.In this paper,we proposed a way of separating single order surface related multiple based on extended SRME.First,all order surface related multiples were predicted by SRME.Second,the boundary conditions of conventional SRME were modified,and the predicted surface multiples from the first step were updated.Third,single order surface multiple can be obtained by the adaptive subtraction between multiples from the first step and the second step by which surface multiples of different orders can be separated gradually.Numerical model and a deep-sea real data test show the effectiveness of this method.Different order multiples were separated effectively,which supports the application of multiples imaging technology.

关 键 词：单阶次多次波 多次波分离 表面相关多次波衰减 多次波成像 

分 类 号：O242[理学—计算数学] P315[理学—数学]