Title

Joint suppression of two types of vibroseis harmonic noise on correlated data

单位

(1.中国石油大学地球科学与技术学院,山东青岛266580;2.中国石油化工股份有限公司地球物理重点实验室,江苏南京211103;3.中国地质科学院地球物理地球化学勘探研究所,河北廊坊065000;4.中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022)

Organization

(1.School of Geosciences,China University of Petroleum,Qingdao 266580,China;2.SINOPEC Key Laboratory of Geophysics,Nanjing 211103,China;3.Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China;4.Geophysical Research Institute,Shengli Oilfield Branch Co.,SINOPEC,Dongying 257022,China)

摘要

谐波是可控震源采集数据中的特殊干扰波。针对力信号内含谐波和表层响应谐波在产生机理与分布特征上的差异,提出了两种不同的相关后数据谐波干扰压制方法:①基于地面力信号设计的力信号内含谐波压制滤波器,采用最小二乘法对预测的谐波干扰进行修正,以实现对力信号内含谐波的准确压制;②分频滤波压制表层响应谐波,根据表层响应谐波的能量与频率分布特征,在不同频段对共中心点道集中的谐波进行压制。这两种谐波压制方法既可以用来直接对相关后数据的谐波噪声进行压制,也可以用来对两种谐波干扰噪声进行联合压制。实际资料试算结果表明:两种谐波干扰联合压制方法可以有效压制相关后数据中的内含谐波和表层响应谐波。

Abstract

Harmonic noise is a special interference wave generated in vibroseis acquisition.Harmonic noise contained in force signal differs from surface response harmonic noise;therefore,the corresponding harmonic suppression method is proposed for the two kinds of noise in correlated data.This paper proposes a filter based on the force signal to accurately suppress the harmonic noise contained in force signal.The least squares method is then adopted to correct the predicted harmonic noise.To suppress the surface response harmonic noise,frequency division filtering is used in CMP gathers,according to the energy and frequency distribution characteristics of this kind of harmonic.The proposed method is performed on correlated data,and could realize joint suppression of two types of vibroseis harmonic noise.Data from field tests indicate that the proposed method can effectively suppress the two kinds of harmonic noise.

关键词：

可控震源; 力信号内含谐波; 表层响应谐波; 地面力信号; 分频滤波;

Keywords:

vibroseis,; harmonic noise contained in force signal,; surface response harmonic noise,; force signal,; frequency division filtering;

基金项目

中国石化地球物理重点实验室开放基金(wtyjy-wx2016-04-1)资助。

DOI

10.3969/j.issn.1000-1441.2018.02.009

可控震源相关数据谐波干扰联合压制方法