低信噪比转换波地震资料静校正(英文)
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摘要
由于转换波具有低速、低信噪比的特点,以及初至拾取和共转换点分选的困难,一些相对成熟的纵波资料静校正方法不能很好地解决转换波静校正问题,转换波静校正问题成为转换波处理取得突破主要技术障碍。为了改进转换波静校正的应用效果,首先利用共检波点叠加静校正方法,通过改善共检波点叠加剖面的质量对检波点进行初始静校正,然后利用叠加能量最大静校正方法,通过改善共转换点剖面的质量对检波点进行更精细的静校正,最后对共转换点道集进行非地表一致性剩余时差校正,增强不同深度反射信号的叠加质量。通过三种静校正方法的联合应用,较好地解决了转换波地震资料的静校正问题。
Converted waves have slow velocity and low signal-to-noise ratio. It is also difficult to pick first-breaks and bin the common-conversion-points (CCP). Some statics methods, which work well for P-wave data, can't be effectively used for solving converted-wave statics problems. This has become the main obstacle to breakthroughs in converted-wave data processing. To improve converted-wave static corrections, first, a statics method based on the common-receiver-point (CRP) stack is used for the initial receiver static correction to enhance the coherency of the CRP stack. Second, a stack-power-maximization static correction which improves the continuity of the CCP stack is used for detailed receiver statics. Finally, a non-surface-consistent residual moveout correction of the CCP gathers is used to enhance the stack power of reflection signals from different depths. Converted-wave statics are solved by the joint use of the three correction methods.
Converted waves have slow velocity and low signal-to-noise ratio. It is also difficult to pick first-breaks and bin the common-conversion-points (CCP). Some statics methods, which work well for P-wave data, can't be effectively used for solving converted-wave statics problems. This has become the main obstacle to breakthroughs in converted-wave data processing. To improve converted-wave static corrections, first, a statics method based on the common-receiver-point (CRP) stack is used for the initial receiver static correction to enhance the coherency of the CRP stack. Second, a stack-power-maximization static correction which improves the continuity of the CCP stack is used for detailed receiver statics. Finally, a non-surface-consistent residual moveout correction of the CCP gathers is used to enhance the stack power of reflection signals from different depths. Converted-wave statics are solved by the joint use of the three correction methods.
引文
Cary, P. W., and Eaton, D. W. S., 1993, A simple method for resolving large converted-wave (P-SV) statics: Geophysics, 58 (3), 429 - 433.
Lawton, D. C, 1989, Computation of refraction static corrections using first-break traveltime differences: Geophysics, 54 (10), 1289 - 1296.
Li, G. F., Peng, S. P., and He, B. S., 2005, Key problems and solutions in processing converted-wave seismic data: Journal of China University of Minal and Technology, 34(1), 41-45.
Liu, C. C, and Xia, Q. L., 2004, Offshore multi-wave, multi-component seismic exploration in Bohai: Applied Geophysics, 1 (1), 26 - 30.
Ronen, J., and Claerbout, J. F., 1985, Surface-consistent residual statics estimation by stack-power maximization: Geophysics, 50 (12), 2759 - 2767.
Schafer, A. W., 1991, The determination of converted-wave statics using P refractions together with SV refractions: 61st Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1413 - 1415.
Lawton, D. C, 1989, Computation of refraction static corrections using first-break traveltime differences: Geophysics, 54 (10), 1289 - 1296.
Li, G. F., Peng, S. P., and He, B. S., 2005, Key problems and solutions in processing converted-wave seismic data: Journal of China University of Minal and Technology, 34(1), 41-45.
Liu, C. C, and Xia, Q. L., 2004, Offshore multi-wave, multi-component seismic exploration in Bohai: Applied Geophysics, 1 (1), 26 - 30.
Ronen, J., and Claerbout, J. F., 1985, Surface-consistent residual statics estimation by stack-power maximization: Geophysics, 50 (12), 2759 - 2767.
Schafer, A. W., 1991, The determination of converted-wave statics using P refractions together with SV refractions: 61st Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1413 - 1415.
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