全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

基于两步SVD变换的零偏VSP资料上下行波场分离方法

DOI: 10.6038/cjg20130524, PP. 1667-1675

Keywords: SVD,零偏VSP,波场分离,同相轴排齐

Full-Text   Cite this paper   Add to My Lib

Abstract:

垂直地震剖面(VerticalSeismicProfiling,VSP)资料处理中波场分离是关键问题之一.随着属性提取技术的发展,新的属性参数(例如Q值)提取技术对波场分离的保真性要求越来越高.本文改进了传统奇异值分解(SingularValueDecomposition,SVD)法,给出了一种对波场的动力学特征具有更好的保真性,可以作为Q值提取的预处理步骤的零偏VSP资料上下行波场分离方法.该方法通过两步奇异值分解变换实现:第一步,排齐下行波同相轴,利用SVD变换压制部分下行波能量;第二步,在剩余波场中排齐上行波同相轴,使用SVD变换提取上行波场.在该方法的实现过程中,压制部分下行波能量后的剩余波场中仍然存在较强的下行波干扰,使得上行波同相轴的排齐比较困难.本文给出了一种通过极大化多道数据线性相关程度(MaximizeCoherence,MC)排齐同相轴的算法,在一定程度上解决了低信噪比下排齐同相轴的问题.将本文提出的方法用于合成数据和实际资料的处理,并与传统SVD法的处理结果进行对比,结果表明本文提出的波场分离方法具有良好的保真性,得到波场的质量明显优于传统SVD法.通过对本文方法和传统SVD法处理合成数据得到的下行波场提取Q值,然后进行对比可知,本文方法可以有效提高所提取Q值的准确性,适合作为Q值提取的预处理步骤.

References

[1]  Raoult J J, Joncheray B, Carron D. The check VSP: A new vertical seismic data acquisition and processing technique. 54th Annual SEG Meeting, SEG Expanded Abstracts, 1984: 839-840.
[2]  Simaan M, Love P L. Optimum suppression of coherent signals with linear move out in seismic data. Geophysics, 1984, 49(3): 215-226.
[3]  朱光明. 垂直地震剖面方法. 北京: 石油工业出版社, 1988. Zhu G M. Vertical Seismic Profiling (in Chinese). Beijing: Petroleum Industry Press, 1988.
[4]  Balch A H, Lee M W, Miller J J, et al. The use of vertical seismic profiles in seismic investigations of the earth. Geophysics, 1982, 47(6): 906-918.
[5]  Simaan M. Optimum array filters for array data signal processing. IEEE Trans. of Acoustics Speech and Signal Processing, 1983, 31(4): 1006-1015.
[6]  王成礼. VSP多道迭代递归滤波波场分离及应用. 石油地球物理勘探, 1991, 26(2): 169-178. Wang C L. A method for VSP wave field separation using multitrace iterative recursion filtering, and its application. Oil Geophysical Prospecting (in Chinese), 1991, 26(2): 169-178.
[7]  Freire S L M, Ulrych T J. Application of singular value decomposition to vertical seismic profiling. Geophysics, 1988, 53(6): 778-785.
[8]  Rieber F. Visual presentation of elastic wave patterns under various structural conditions. Geophysics, 1936, 1(2): 196-218. 图3 实际VSP资料算例 (a)实际零偏VSP波场;(b)MC算法排齐上行波的结果;(c)本文方法得到的上行波场;(d)本文方法得到的 下行波场;(e)传统SVD法得到的上行波场;(f)传统SVD法得到的奇异值曲线. Fig.3 Real data example (a) Zero-offset VSP data; (b) Upgoing wave aligned using MC approach; (c) Upgoing wavefield separated by our method; (d) Downgoing wavefield separated by our method; (e) Upgoing wavefield separated by traditional SVD approach; (f) Singular value curve.
[9]  Carswell A, Tag R, Dillistone C, et al. A new method of wavefield separation in VSP data processing. 54th Annual SEG Meeting, SEG Expanded Abstracts, 1984: 40-42.
[10]  Blias E. VSP wavefield separation: Wave-by-wave optimization approach. Geophysics, 2007, 72(4): 47-55.
[11]  杜婧, 王尚旭, 刘国昌等. 基于局部斜率属性的VSP波场分离研究. 地球物理学报, 2009, 52(7): 1867-1872. Du J, Wang S X, Liu G C, et al. VSP wavefield separation using local slopes attribute. Chinese J. Geophys. (in Chinese), 2009, 52(7): 1867-1872.
[12]  Gao J H, Yang S L, Wang D X, et al. Estimation of quality factor Q from the instantaneous frequency at the envelope peak of a seismic signal. Journal of Computational Acoustics, 2011, 19(2): 155-179.
[13]  Hyvrinen A, Karhunen J, Oja E. Independent Component Analysis. New York: John Wiley & Sons, Inc., 2001.
[14]  Montagne R, Vasconcelos G L. Optimized suppression of coherent noise from seismic data using the Karhunen-Loève transform. Physical Review E, 2006, 74(1): 16213-1-16213-8.
[15]  凌永祥, 陈明逵. 计算方法教程. 西安: 西安交通大学出版社, 2005. Ling Y X, Chen M K. A Course in Computational Method (in Chinese). Xi''an: Xi''an Jiaotong University Press, 2005.
[16]  Ganley D C. A method for calculating synthetic seismograms which include the effects of absorption and dispersion. Geophysics, 1981, 46(8): 1100-1107.
[17]  高静怀, 杨森林, 王大兴. 利用VSP 资料直达波的包络峰值处瞬时频率提取介质品质因子. 地球物理学报, 2008, 51(3): 853-861. Gao J H, Yang S L, Wang D X. Quality factor extraction using instantaneous frequency at envelope peak of direct waves of VSP data. Chinese J. Geophys. (in Chinese), 2008, 51(3): 853-861.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133