菲涅耳体初至层析静校正技术的研究与应用
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摘要
菲涅耳体初至层析静校正技术通过菲涅耳体初至层析反演方法建立复杂近地表速度模型,再利用该模型计算近地表一致性静校正量,然后应用计算的静校正量对地震剖面进行静校正处理,以提高成像质量。该技术主要包括初至拾取;初至层析反演近地表速度模型;模型底界面、基准面、替换速度等参数的确定;激发点和接收点静校正量的计算;静校正量的应用等方面。关键是菲涅耳体初至层析反演方法。该方法考虑地震波主频的影响,不需要追踪射线路径,能减少反演过程的不稳定性和反演结果的不确定性,抗误差能力强,保持了数据本身的分辨率和可靠性。菲涅耳体初至层析静校正技术适合复杂地区静校正处理,实际资料静校正效果良好。
Static correction technology of Fresnel body first arrival tomography is to build complex near surface velocity model by the Fresnel body first arrival tomography inversion method,and then use the model to calculate the amount of near-surface consistent static correction,and apply the calculation of the static correction to improve image quality.The technology mainly includes first arrival pick up,tomography inversion of near-surface velocity model,model high velocity layer interface,datum,replacement velocity and other parameters,the calculation of static correction of source and detect point,and the application of static correction.The key thing is Fresnel body first arrival tomography inversion.The method considers the frequency of seismic waves,no trace ray paths,and reducing the instability of the inversion process and the uncertainty of the inversion result.It has strong anti-error capacity,and can maintain the resolution and reliability of the data itself.The static correction technology of Fresnel body first arrival tomography is suitable for complex region,and the static correction of the actual data performs better than other method.
Static correction technology of Fresnel body first arrival tomography is to build complex near surface velocity model by the Fresnel body first arrival tomography inversion method,and then use the model to calculate the amount of near-surface consistent static correction,and apply the calculation of the static correction to improve image quality.The technology mainly includes first arrival pick up,tomography inversion of near-surface velocity model,model high velocity layer interface,datum,replacement velocity and other parameters,the calculation of static correction of source and detect point,and the application of static correction.The key thing is Fresnel body first arrival tomography inversion.The method considers the frequency of seismic waves,no trace ray paths,and reducing the instability of the inversion process and the uncertainty of the inversion result.It has strong anti-error capacity,and can maintain the resolution and reliability of the data itself.The static correction technology of Fresnel body first arrival tomography is suitable for complex region,and the static correction of the actual data performs better than other method.
引文
[1]VASCO WD,JR E P,MAJER L E.Beyond ray tomography:wave-paths and fresnel volumes[J].Geophysics,1995,60(6):1790-1804.
[2]王宏伟.菲涅耳体地震层析[J].石油地球物理勘探,1996,31(3):309-326,466.
[2]王宏伟.菲涅耳体地震层析[J].石油地球物理勘探,1996,31(3):309-326,466.
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