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逆时偏移中波形光滑性分析与波形校正研究
杨仁虎1, 凌云2, 常旭3, 丰叶4
1.防灾科技学院, 河北三河 065201;2.中国石油集团东方地球物理勘探有限责任公司, 河北涿州 072751;3.中国科学院地质与地球物理研究所, 北京 100029;4.以色列特拉维夫大学地球物理系, 特拉维夫
摘要:
针对RTM成像波形不光滑的问题进行研究,利用简单模型分析了空间、时间采样间隔对成像波形光滑性的影响。结果表明,空间采样间隔对波形光滑性的影响较大,而时间采样间隔的改变并不能改变波形光滑性。利用三次样条插值,在空间上对RTM成像波形进行插值,可以解决波形不光滑问题。通过复杂模型进行验证,也证明了该方法的有效性。同时对RTM成像剖面沿层地震属性(瞬时振幅、瞬时频率、瞬时相位)进行了分析,结果表明波形经过光滑校正后可以提高地震属性的横向空变稳定性。
关键词:  逆时偏移  波形光滑性  三次样条插值  地震属性
DOI:
分类号:P315
基金项目:中央高校基本科研业务费专项(ZY20180239)、国家自然科学基金项目(41390455)共同资助
Analysis of Waveform Smoothness and Waveform Correction for Reverse Time Migration
Yang Renhu1, Ling Yun2, Chang Xu3, Feng Ye4
1.Institute of Disaster Prevention, Sanhe 065201, Hebei, China;2.Bureau of Geophysical Prospecting, China National Petroleum Corporation, Zhuozhou 072751, Hebei, China;3.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;4.Department of Geophysics, Tel Aviv University, Tel Aviv, Israel
Abstract:
In this paper,the problem of waveform unsmoothness in RTM imaging is studied,and the influence of spatial and temporal sampling intervals on waveform smoothness is analyzed by using a simple model. The results show that the spatial sampling interval has great influence on the smoothness of waveform,while the change of temporal sampling interval cannot change the smoothness of waveform. The waveform unsmoothness can be solved by interpolating RTM image waveform in space by cubic spline interpolation. The validity of the method is verified by a complex model. At the same time,the seismic properties(instantaneous amplitude,instantaneous frequency and instantaneous phase)along layers of the RTM imaging are analyzed,and the results show that the waveform can improve the lateral spatial variation stability of seismic properties after smooth correction.
Key words:  Reverse time migration  Waveform smoothness  Cubic spline interpolation  Seismic attributes