直接消除电磁耦合的斩波去耦方法资料.pdfVIP

第 49 卷 第 6 期 地 球 物 理 学 报 Vol. 49, No. 6 2006 年 11 月 CHINESE JOURNAL OF GEOPHYSICS Nov. , 2006 何继善, 熊 彬, 鲍力知等. 直接消除电磁耦合的斩波 去耦方法. 地球物理学报, 2006, 49( 6) : 1843~ 1850 He J S, Xiong B, Bao L Z, et al. A direct induced- polarization decoupling scheme by chop- wave. Chinese J . Geophys. ( in Chinese) , 2006, 49( 6) : 1843~ 1850 直接消除电磁耦合的斩波去耦方法 何继善, 熊 彬, 鲍力知, 傅国红 中南大学信息物理工程学院, 长沙 410083 摘 要 应用激发极化法时经常遇到电磁耦合的干扰. 基于耦合效应和激电效应在双频波 测量波形 上具有不同 的 表现形式, 提出一种在野外采集激电数据时, 直接剔除电磁耦合而又基本上不损失激 电信息的/ 斩波0 去 耦方法. 本 文从/ 斩波去耦0 的方法原理、斩波对正常双频波产生的 畸变、以及存在 EM 和 IP 效应时 的双频波 斩波等 方面进 行 了详 细的推导和分析. 数值计算结果表明, 该方法去耦效 果明显, 可 以在现场 条件下 直接去 耦, 值 得在激 发极化 法 中推广应用. 关键词 双频激电法, 电磁耦合效应, 激电效应, 斩波去 耦 文章编号 0001- 5733( 2006) 06- 1843- 08 中图分类号 P631 收稿日期 2005- 11- 28,2006- 06- 14 收修定稿 A direct induced-polarization decoupling scheme by chop-wave HE J-i Shan, XIONG Bin, BAO L-i Zhi, FU Guo-Hong School of Inf o-Physics and Geomatics Engineering, Central South University , Changsha 410083, China Abstract It is known that the electromagnetic coupling effect is a disturbance factor in induced-polarization measurements. Based on the different appearances of EM coupling effect and IP effect in measured dua-l frequency waveform, a direct decoupling scheme by chop-wave is presented in this paper. The method is able to eliminate EM coupling effect directly during the field data acquisition, and it does not suffer loss of IP information by and large. This paper has mainly discussed several aspects, which include the fundamentals of chop-wave, the distortion of normal dua-l frequency wave resulting from cho