基于时频分析的地震道集校平技术应用
|
摘要
依据现代信号分析理论,对叠前地震道集剩余动校正量的消除技术进行研究,在模型数据和实际数据的试验基础上,探讨基于时频分析技术的叠前道集校平方法。结果表明:通过对地震信号进行时频分解,并在信号重构时完成高精度的剩余动校正量的消除,处理前后信号振幅不变,道集同相性增强,叠加后信号有效频带变宽;利用近偏移距地震道的叠加道作为模型道,在有效消除剩余时差和校平同相轴的同时,避免了叠前道集动校拉伸畸变对模型道的影响,保证了技术实现的精度;该方法在消除叠前道集中剩余动校正量方面具有较强的实用性。
In terms of the modern signal analysis theory and the experiment of model data and actual data,the method based on time-frequency analysis to conduct pre-stack gather smoothing was discussed through the research of eliminating the residual normal moveout(NMO) of the pre-stack gather. The results show that the amplitude remains unchanged after processing,gather in phase increases,and the effective frequency band of the post-stack signal broadens by time-frequency decomposition seismic signal and high-accuracy elimination residual NMO in signal reconstruction. Using sub-stack of near-offset seismic gather as a model trace,the impact of the dynamic stretching distortion on the model trace is avoided when the residual moveout is eliminated effectively and the event is flattened,thus the accuracy of the technology can be ensured. This method shows practicalness for eliminating the residual NMO in the pre-stack gather.
In terms of the modern signal analysis theory and the experiment of model data and actual data,the method based on time-frequency analysis to conduct pre-stack gather smoothing was discussed through the research of eliminating the residual normal moveout(NMO) of the pre-stack gather. The results show that the amplitude remains unchanged after processing,gather in phase increases,and the effective frequency band of the post-stack signal broadens by time-frequency decomposition seismic signal and high-accuracy elimination residual NMO in signal reconstruction. Using sub-stack of near-offset seismic gather as a model trace,the impact of the dynamic stretching distortion on the model trace is avoided when the residual moveout is eliminated effectively and the event is flattened,thus the accuracy of the technology can be ensured. This method shows practicalness for eliminating the residual NMO in the pre-stack gather.
引文
[1]王云专,杨立伟,李素华.剩余时差校正及泊松比反演[J].地球物理学进展,2006,21(1):214-218.WANG Yun-zhuan,YANG Li-wei,LI Su-hua.Residual moveout correction and Poisson s ratio inversion[J].Pro-gress in Geophysics,2006,21(1):214-218.
[2]林伯香,孙建国.相位替换法剩余时差校正[J].石油物探,2001,40(3):15-22.LIN Bo-xiang,SUN Jian-guo.Residual moveout correc-tion by using phase replacement[J].Geophysical Pros-pecting for Petroleum,2001,40(3):15-22.
[3]程玉坤,冉建斌,肖伟.基于CRP道集的叠前处理技术及应用[J].勘探地球物理进展,2008,31(1):38-43.CHENG Yu-kun,RANJian-bin,XIAO Wei.CRP gather based prestack data processing and its application[J].Progress in Exploration Geophysics,2008,31(1):38-43.
[4]刘洋,魏修成.基于线性连续速度模型的速度分析与动校正方法[J].石油勘探与开发,2003,30(5):71-74.LIU Yang,WEI Xiu-cheng.Velocity analysis and normal moveout correction based on linear continuous velocity model[J].Petroleum Exploration and Development,2003,30(5):71-74.
[5]刘葵,刘招军,朱建伟,等.时频分析在石油地球物理勘探中的应用[J].世界地质,2000,19(3):282-285.LIU Kui,LIU Zhao-jun,ZHU Jian-wei,et al.Applica-tion of time-frequency analysis in geology[J].World Ge-ology,2000,19(3):282-285.
[2]林伯香,孙建国.相位替换法剩余时差校正[J].石油物探,2001,40(3):15-22.LIN Bo-xiang,SUN Jian-guo.Residual moveout correc-tion by using phase replacement[J].Geophysical Pros-pecting for Petroleum,2001,40(3):15-22.
[3]程玉坤,冉建斌,肖伟.基于CRP道集的叠前处理技术及应用[J].勘探地球物理进展,2008,31(1):38-43.CHENG Yu-kun,RANJian-bin,XIAO Wei.CRP gather based prestack data processing and its application[J].Progress in Exploration Geophysics,2008,31(1):38-43.
[4]刘洋,魏修成.基于线性连续速度模型的速度分析与动校正方法[J].石油勘探与开发,2003,30(5):71-74.LIU Yang,WEI Xiu-cheng.Velocity analysis and normal moveout correction based on linear continuous velocity model[J].Petroleum Exploration and Development,2003,30(5):71-74.
[5]刘葵,刘招军,朱建伟,等.时频分析在石油地球物理勘探中的应用[J].世界地质,2000,19(3):282-285.LIU Kui,LIU Zhao-jun,ZHU Jian-wei,et al.Applica-tion of time-frequency analysis in geology[J].World Ge-ology,2000,19(3):282-285.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心