Estimation of Q and inverse Q filtering for prestack reflected PP- and converted PS-waves
Yan Hongyong1,2 and Liu Yang1,2
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249, China.
2. CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum, Beijing, 102249, China.
Abstract：
Multi-component seismic exploration technology, combining reflected PP- and converted PS-waves, is an effective tool for solving complicated oil and gas exploration problems. The improvement of converted wave resolution is one of the key problems. The main factor affecting converted wave resolution is the absorption of seismic waves in overlying strata. In order to remove the effect of absorption on converted waves, inverse Q filtering is used to improve the resolution. In this paper, we present a method to estimate the S-wave Q values from prestack converted wave gathers. Furthermore, we extend a stable and effective poststack inverse Q filtering method to prestack data which uses wave field continuation along the ray path to compensate for attenuation in prestack common shot PP- and PS-waves. The results of theoretical modeling prove that the method of estimating the S-wave Q values has high precision. The results from synthetic and real data prove that the stable inverse Q filtering method can effectively improve the resolution of prestack PP- and PS-waves.
YAN Hong-Yong,LIU Yang. Estimation of Q and inverse Q filtering for prestack reflected PP- and converted PS-waves[J]. APPLIED GEOPHYSICS, 2009, 6(1): 59-69.
[1]
Bano, M., 1996, Q-phase compensation of seismic records in the frequency domain: Bull. Seis. Soc. Am., 86(4), 1179 - 1186.
[2]
Bickel, S. H., and Natarajan, R. R., 1985, Plane-wave Q deconvolution: Geophysics, 50(9), 1426 - 1439.
[3]
Carderon-Macias, C., Ortiz-Osornio, M., and Ramos-Martinez, J., 2004, Estimation of quality factors from converted-wave PS data: 74th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts.
[4]
Dasgupta, R., and Clark, R. A., 1998, Estimation of Q from surface seismic reflection data: Geophysics, 63(6), 2120 - 2128.
[5]
Gao, J. H., and Yang, S. L., 2007, On the method of quality factors estimation from zero-offset VSP data: Chinese Journal of Geophysics (in Chinese), 50(4), 1198 - 1209.
[6]
Hale, D., 1981, An inverse Q-filter: SEP Report 26, 231 - 243.
[7]
Hargreaves, N. D., and Calvert, A. J., 1991, Inverse Q filtering by Fourier transform: Geophysics, 56(4), 519 - 527.
[8]
Kolsky, H., 1956, The propagation of stress pulses in viscoelastic solids: Phil. Mag., 8(1), 673 - 710.
[9]
Liu, C., Liu, Y., Wang, D., Yang, B. J., Gao, Z. S., and Li, Y. Z., 2005, A method to compensate strata absorption and attenuation in frequency domain: Geophysical Prospecting For Petroleum (in Chinese), 20(4), 1074 - 1082.
[10]
Liu, Y., and Wei, X. C., 2005, Interval Q inversion from CMP gathers: part I-absorption equation: 75th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1717 - 1720.
[11]
Liu, Y., and Wei, X. C., 2005, Interval Q inversion from CMP gathers: part II-inversion method: 75th Ann Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1721 - 1724.
[12]
Ma, Z. J., and Liu, Y., 2005, A summary of research on seismic attenuation: Progress In Geophysics (in Chinese), 20(4), 1027 - 1082.
[13]
McCarley, L. A., 1985, An autoregressive filer model for constant Q attenuation: Geophysics, 50(5), 749 - 758.
[14]
Quan, Y., and Harris, J. M., 1997, Seismic attenuation tomography using the frequency shift method: Geophysics, 62, 895 - 905.
Rickett, J., 2007, Estimating attenuation and the relative information content of amplitude and phase spectra: Geophysics, 72(1), R19 - R27.
[17]
Tonn, R., 1991, The determination of the seismic quality factor Q from VSP data: A comparison of different computational methods: Geophysical Prospecting, 39, 1 - 27.
[18]
Wang, Y. H., 2002, A stable and efficient approach of inverse Q filtering: Geophysics, 67(2), 657 - 663.
[19]
Wang, Y. H., 2003, Quantifying the effectiveness of stabilized inverse Q filtering: Geophysics, 68(1), 337 - 345.
[20]
Wang, Y. H., 2006, Inverse Q-filter for seismic resolution enhancement: Geophysics, 71(3), 51 - 60.
[21]
Wang, Y. H., and Guo, J., 2004, Modified Kolsky model for seismic attenuation and dispersion: Journal of Geophysics and Engineering, 1(3), 187 - 196.
[22]
Zhang, C. J., and Tadeusz, J. U., 2007, Seismic absorption compensation: A least squares inverse scheme: Geophysics, 72(6), 109 - 114.
[23]
Zhang, C. J., and Ulrych, T. J., 2002, Estimation of quality factors from CMP records: Geophysics, 67(5), 1542 - 1547.
[24]
Zhang, X. W., Han, L. G., Zhang, F. J., and Shan, G. G., 2007, An inverse Q-filter algorithm based on stable wavefield continuation: Applied Geophysics, 4(4), 263 - 270.
2009, Vol. 6 
