Conventional joint PP-PS inversion is based on approximations of the Zoeppritz equations and assumes constant VP/VS;therefore,the inversion precision and stability cannot satisfy current exploration requirements.We pr...Conventional joint PP-PS inversion is based on approximations of the Zoeppritz equations and assumes constant VP/VS;therefore,the inversion precision and stability cannot satisfy current exploration requirements.We propose a joint PP-PS inversion method based on the exact Zoeppritz equations that combines Bayesian statistics and generalized linear inversion.A forward model based on the exact Zoeppritz equations is built to minimize the error of the approximations in the large-angle data,the prior distribution of the model parameters is added as a regularization item to decrease the ill-posed nature of the inversion,low-frequency constraints are introduced to stabilize the low-frequency data and improve robustness,and a fast algorithm is used to solve the objective function while minimizing the computational load.The proposed method has superior antinoising properties and well reproduces real data.展开更多
The Leading Eage 2007年第1期“低频地震”专辑简介
地震勘探领域的地球物理工作者早就认识到把地震测量的带宽拓展到远低于10Hz所带来的种种好处。低频成分在将地震资料转换成波阻抗剖面并最终获取储层属性的反演过程中也起着决定作...The Leading Eage 2007年第1期“低频地震”专辑简介
地震勘探领域的地球物理工作者早就认识到把地震测量的带宽拓展到远低于10Hz所带来的种种好处。低频成分在将地震资料转换成波阻抗剖面并最终获取储层属性的反演过程中也起着决定作用。地震时激发的低频波比高频波在地下传播的更远，就如同越沉闷的雷声在空气中的传得越远一样。因此，对于深部勘探目标，如盐下和玄武岩下远景区及深部地壳研究，地震低频端（〈10Hz）能量的大小对于弄清这些深层目标是特别重要的。在世界上的许多地区，高频地震波的衰减、散射和弥散等的程度远高于低频，使得地面地震资料缺乏精确反演所必需的低频成分，这时通常是采用测井数据来加以弥补。当测井数据太稀疏或没有测井数据时，地震反演结果就可能是有问题的。展开更多
基金supported by the 863 Program of China(No.2013AA064201)
文摘Conventional joint PP-PS inversion is based on approximations of the Zoeppritz equations and assumes constant VP/VS;therefore,the inversion precision and stability cannot satisfy current exploration requirements.We propose a joint PP-PS inversion method based on the exact Zoeppritz equations that combines Bayesian statistics and generalized linear inversion.A forward model based on the exact Zoeppritz equations is built to minimize the error of the approximations in the large-angle data,the prior distribution of the model parameters is added as a regularization item to decrease the ill-posed nature of the inversion,low-frequency constraints are introduced to stabilize the low-frequency data and improve robustness,and a fast algorithm is used to solve the objective function while minimizing the computational load.The proposed method has superior antinoising properties and well reproduces real data.
文摘The Leading Eage 2007年第1期“低频地震”专辑简介
地震勘探领域的地球物理工作者早就认识到把地震测量的带宽拓展到远低于10Hz所带来的种种好处。低频成分在将地震资料转换成波阻抗剖面并最终获取储层属性的反演过程中也起着决定作用。地震时激发的低频波比高频波在地下传播的更远，就如同越沉闷的雷声在空气中的传得越远一样。因此，对于深部勘探目标，如盐下和玄武岩下远景区及深部地壳研究，地震低频端（〈10Hz）能量的大小对于弄清这些深层目标是特别重要的。在世界上的许多地区，高频地震波的衰减、散射和弥散等的程度远高于低频，使得地面地震资料缺乏精确反演所必需的低频成分，这时通常是采用测井数据来加以弥补。当测井数据太稀疏或没有测井数据时，地震反演结果就可能是有问题的。
