Page 33 - 《应用声学》2020年第1期
P. 33

第 39 卷 第 1 期                                                                       Vol. 39, No. 1
             2020 年 1 月                          Journal of Applied Acoustics                   January, 2020

             ⋄“全国储层声学与深部钻测技术前沿研讨会”举办十周年 ⋄



                           基于几何级数展开的鬼波压制方法                                                   ∗





                          陈宝书      1†  吴 玉     2   陶 杰    1   管西竹      1  刘春城      1   符力耘     3


                                            (1 中海油研究总院有限责任公司        北京   100028)
                             (2 中国科学院油气资源研究重点实验室          中国科学院地质与地球物理研究所          北京   100029)
                                        (3 中国石油大学 (华东) 地球科学与技术学院        青岛   266580)

                摘要：海上拖缆地震数据采集，检波器位于海平面以下，由于海平面的反射作用，检波器接收到的除了上行的
                一次波，还包括下行的鬼波，因为一次波和鬼波的干涉作用，导致地震信号的有效频带变窄，分辨率降低。为了
                恢复信号的有效频带，需要进行鬼波压制的宽频处理。该文提出了一种基于逆鬼波算子几何级数展开的鬼波
                压制技术。几何级数的每一项都是一个波场传播算子，级数的叠加可以实现鬼波的压制，通过对几何级数的截
                断，可以得到只含上行波的反射信号。数值算例证明了该文方法的有效性，因为波场延拓算子在频率波数域进
                行，借助快速傅里叶变换，该文方法的效率很高。
                关键词：地震鬼波压制；逆鬼波算子；几何级数；频率波数域
                中图法分类号: P315.9          文献标识码: A          文章编号: 1000-310X(2020)01-0029-07
                DOI: 10.11684/j.issn.1000-310X.2020.01.004



                            Seismic deghosting based on geometric series expansion


                     CHEN Baoshu  1  WU Yu  2  TAO Jie 1  GUAN Xizhu  1  LIU Chuncheng  1  FU Liyun 3

                                     (1 CNOOC Research Institute Co. Ltd., Beijing 100028, China)
                    (2 Key Laboratory of Petroleum Resource Research, Institute of Geology and Geophysics, Chinese Academy of
                                                 Sciences, Beijing 100029, China)
                         (3 School of Geosciences & Technology, China University of Petroleum, Qingdao 266580, China)

                 Abstract: Deghosting is a longstanding problem in marine seismic processing. Due to the presence of the
                 free-surface, the interferences between up-and down-going wavefields are present in the recorded data, resulting
                 in notches in the amplitude spectrum of the recorded data. This leads to a reduction of the useful frequency
                 bandwidth and therefore damages seismic resolution. It is desirable to remove the ghost events from the
                 recorded data to gain broader bandwidth data. In this paper, we propose a deghosting method based on
                 the geometric series approximation of the inverse ghost operator. Each item of the geometric series can be
                 viewed as wave field propagation operator. The superposition of this series can achieve ghost suppression.
                 By truncating the geometric progression, a reflected signal containing only the upward wave can be obtained.
                 Numerical examples demonstrate the effectiveness of the proposed method. Because we can perform wavefield
                 extrapolation in the FK domain, this method is also efficient by the use of FFT.
                 Keywords: Seismic deghosting; Inverse ghost operator; Geometric series; FK domain


             2019-09-19 收稿; 2019-11-28 定稿
             国家科技重大专项 (2016ZX05026-001-002)
             ∗
             作者简介: 陈宝书 (1964– ), 男, 北京人, 博士, 教授级高级工程师, 研究方向: 地震资料处理方法。
              通信作者 E-mail: chenbsh@cnooc.com.cn
             †
   28   29   30   31   32   33   34   35   36   37   38