Abstract
Near-surface diffractors are one of the problems in land seismic exploration. They can scatter the surface wave energy emanating from the seismic source and contaminate the signal received by seismic receivers. The scattered energy from the near-surface diffractors manifests itself on seismic shot gathers as strong hyperbolic events, called diffractions, masking the weakly reflected body waves. Diffractions present complications to most of surface-wave suppression schemes, especially when they have been scattered by scatterers outside the receiver line. Different methods have been used to eliminate diffractions from seismic data, including geophone arrays, filtering, and inverse scattering. Each of those methods has its own limitations. In this study, we present processing algorithms to map and attenuate near-surface diffractors of surface waves in seismic shot gathers. The mapping algorithm is based on semblance measurements and time–offset relations, while the attenuation algorithm is based on the least-square fitting of a source wavelet. The algorithms are applied on synthetic data from two different models. The first model has three near-surface diffractors, while the second model has three clusters of near-surface diffractors. Each cluster consists of three near-surface diffractors with a different geometry for each cluster. The results show that the proposed algorithms are successful in locating and attenuating most near-surface diffractors, except when the separation between individual diffractors is below the wavelength of the diffracted surface wave.
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References
Al-Shuhail AA, Al-Ghamdi AM (2000) Removal of backscattered noise from shot records by forward modeling. Land Seismic Imaging Forum (Arabian Peninsula), Manama
Baeten GJM, Belougne V, Combee L, Kragh E, Laake A, Martin JE, Orban J, Ozbek A, Vermeer PL (2000) Acquisition and processing of point receiver measurements in land seismic. Extended Abstracts, 70th Annual International Meeting SEG, pp 41–44
Blonk B, Herman GC (1994) Inverse scattering of surface waves: a new look at surface consistency. Geophysics 59:963–972
Gulunay N, Magesan M, Conner J (2006) Diffractor scan (DSCAN) for attenuating scattered energy. EAGE 68th Conference & Exhibition, Vienna, Austria, 12–15 June, 2006
Herman GC, Perkins C (2006) Predictive removal of scattered noise. Geophysics 71:V41–V49
Neidell NS, Taner MT (1971) Semblance and other coherency measurements for multichannel data. Geophysics 36:482–497
Nemeth T, Sun H, Schuster GT (2000) Separation of signal and coherent noise by migration filtering. Geophysics 65:574–583
Sheriff RE, Geldart PG (1995) Exploration seismology. Cambridge University Press, London
Yilmaz O (1987) Seismic data processing. SEG, Tulsa, OK
Acknowledgments
We thank KFUPM and Schlumberger Dhahran Carbonate Research Center for supporting this research.
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Al-Lehyani, A.F., Al-Shuhail, A.A. Mapping and attenuation of surface waves side scattered by near-surface diffractors. Arab J Geosci 7, 757–771 (2014). https://doi.org/10.1007/s12517-013-0836-2
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DOI: https://doi.org/10.1007/s12517-013-0836-2