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...

基于逆虚折射干涉法有效提取近地表弱地震信号

DOI: 10.6038/cjg20140621, PP. 1900-1909

Keywords: 地震干涉,逆虚折射,固定相位,反褶积

Full-Text   Cite this paper   Add to My Lib

Abstract:

在地震勘探中,地形起伏和近地表速度的剧烈变化会导致地震波旅行时的扰动,通常会通过折射波信息来估算和消除这些扰动.本文在虚折射的基础上提出了逆虚折射干涉法,通过虚折射波场和原始折射波场的互相关,并对所有位于固定相位点上的检波点进行叠加,重构出逆虚折射波场.通过逆虚折射与超级虚折射的叠加,保证了不同偏移距下折射波振幅恢复的一致性,显著提高折射波的信噪比,有效提取弱信号.同时,本文采用反褶积干涉法来压制由于互相关和褶积产生的子波旁瓣的影响,弥补低频和高频能量的损失,改善恢复的折射波场的稳定性和分辨率.该新方法不需要知道近地表复杂速度模型的信息,可以将虚折射的勘探孔径恢复到原始地震记录的最大孔径.合成资料和实际资料的计算结果表明,基于反褶积的逆虚折射干涉法能够从低信噪比的资料中,有效恢复出折射波信息.

References

[1]  Bharadwaj P, Schuster G T, Mallinson I, et al. 2011. Super-virtual Refraction Interferometry: Theory. 81st SEG Annual Meeting, Expanded Abstracts, 3809-3813.
[2]  Claerbout J F. 1968. Synthesis of a layered medium from its acoustic transmission response. Geophysics, 33(2): 264-269.
[3]  Draganov D, Wapenarr K, Thorbecke J. 2006. Seismic interferometry: Reconstructing the earth''s reflection response. Geophysics, 71(4): SI61-SI70.
[4]  Dong S Q, Sheng J, Schuster J T. 2006. Theory and practice of refraction interferometry. 76th SEG Annual Meeting, Expanded Abstracts, 3021-3025.
[5]  Hanafy S M, Ola A, Feras A T. 2011. Super-virtual refraction interferometry: Field data example over a colluvial wedge. 81st SEG Annual Meeting, Expanded Abstracts, 3814-3818.
[6]  Liu Y K, Chang X, Wang H, et al. 2001. Estimation of near-surface velocity and seismic tomographic static corrections. Chinese J. Geophys. (in Chinese), 44(2): 272-278.
[7]  Mallinson I, Bharadwaj P, Schuster G, et al. 2011. Enhanced refractor imaging by supervirtual interferometry. The Leading Edge, 30(5): 546-550.
[8]  Wu S P, Peng G X, Huang L Z, et al. 2011. Seismic interferometry imaging based on virtual source estimation with complex overburden. Chinese J. Geophys. (in Chinese), 54 (7): 1874-1882,doi:10.3969/j.issn.0001-5733.2011.07.021.
[9]  Yilmaz O, Doherty S M. 2001. Seismic Data Analysis. Tulsa: Society of Exploration Geophysicists.
[10]  Alshuail A, Aldawood A, Hanafy S. 2012. Application of super-virtual seismic refraction interferometry to enhance first arrivals: A case study from Saudi Arabia. The Leading Edge, 31(1): 34-39.
[11]  Mikesell T D, van Wijk K. 2012. Seismic refraction interferometry with a semblance analysis on the crosscorrelation gather. Geophysics, 76(5): SA77-SA82.
[12]  Mikesell T D, van Wijk K, Calvert A, et al. 2009. The virtual refraction: Useful spurious energy in seismic interferometry. Geophysics, 74(3): A13-A17.
[13]  Mikesell T D, van Wijk K, Ruigrok E, et al. 2012. A modified delay-time method for statics estimation with the virtual refraction. Geophysics, 77(6): A29-A33.
[14]  Schuster G T. 2001. Theory of daylight/interferometric imaging: Tutorial. 63rdAnnual EAGE meeting, Expanded Abstracts, A-32.
[15]  Schuster G T. 2009. Seismic Interferometry. Cambridge: Cambridge University Press.
[16]  Schuster G T, Yu J, Sheng J, et al. 2004. Interferometric/daylight seismic imaging. Geophys. J. Int., 157(2): 838-852.
[17]  Wapenaar K, Fokkema J. 2006. Green''s function representations for seismic interferometry. Geophysics, 71(4): SI33-SI46.
[18]  Yuan S Y, Wang S X. 2011. Influence of inaccurate wavelet phase estimation on seismic inversion. Applied Geophysics, 8(1): 48-59.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133