井间地震层析成像中自动生成初始速度模型的方法研究
|
摘要
初始速度模型对走时层析成像的质量和收敛速度影响很大,但对初始速度如何选择这一问题的探讨不多。经初步研究,提出了一种自动求取层析成像初始速度模型的方法。该方法假定激发点到接收点间的射线是直射线,并利用从地震记录上拾取的初至走时来求取初始速度模型。初始速度模型的建立由程序自动实现,无需人工干预。最后,用数值模拟和物理模型进行了验算,将获得的初始速度模型用于同时迭代重建技术(SIRT)层析成像处理,处理结果与真实速度模型基本对应。
Aim to the initial velocity chose, this method is supposed that the ray from shot to receiver is straight, and the observed traveltimes picked from the seismic sections, the initial velocity model used in the seismic tomography can be calculated. The advantage is not depended on the log data, based on the observed traveltimes completely. The Simultaneous Iterative Reconstruction Technique is utilizes the ray-bending tracing operator based on the Shorted Path Tree. This method is practical by the tomographic results of numeric and physical models. Meanwhile, it is simple and complemented easily, improve the efficacy and stability of tomography algorithm.
Aim to the initial velocity chose, this method is supposed that the ray from shot to receiver is straight, and the observed traveltimes picked from the seismic sections, the initial velocity model used in the seismic tomography can be calculated. The advantage is not depended on the log data, based on the observed traveltimes completely. The Simultaneous Iterative Reconstruction Technique is utilizes the ray-bending tracing operator based on the Shorted Path Tree. This method is practical by the tomographic results of numeric and physical models. Meanwhile, it is simple and complemented easily, improve the efficacy and stability of tomography algorithm.
引文
1 Bishop T N, Bube K P, Cutler R T,et al. Tomographic determination of velocity and depth in laterally varying media[J]. Geophysics, 1985, 50(6) :903-923
2 Harris J M, Nolen- Hoeksema R C, Langan R T, et al. High resolution crosswell imaging of a west Texas carbonate reservoir, Part 1: Project summary and inter-pretation[J]. Geophysics, 1995,60(3) :667-681
3 Nakanishi I, Yamaguchi K. A numerical experiment on nonlinear image reconstruction from first arrival times for two dimensional island arc structure[J]. Journal of Physical Earth, 1986,34(2): 195-201
4 Pratt R P. seismic waveform inversion in the frequency domain. Part 1: Theory and verification in a physical scale model[J]. Geophysics, 1999,64(3):888-901
5 Kosloff D, Sudman Y. Uncertainty in determining interval velocities from surface reflection seismics[J]. Ge- ophysics, 2002, 67(3) :952-963
6吴律．层析基础及其在井间地震中的应用[M]．北京: 石油工业出版社,1997．32-66
7杨文采．李幼铭．应用地震层析成像[M]．北京:地质出 版社,1993．1-48
8 Moser T J. Shortest path calculation of seismic rays [J]. Geophysics, 1991,56(1):59-67
9欧庆贤,韩震．王举红,等．立体地震法——开发地震中 的新工具[J]．石油物探,1998,37(4):13-31
10 陈国金,售辉,吴永栓,等．最短路径层析成像技术在井 间地震中的应用[J]．石油物探,2004,43(4):327-330
2 Harris J M, Nolen- Hoeksema R C, Langan R T, et al. High resolution crosswell imaging of a west Texas carbonate reservoir, Part 1: Project summary and inter-pretation[J]. Geophysics, 1995,60(3) :667-681
3 Nakanishi I, Yamaguchi K. A numerical experiment on nonlinear image reconstruction from first arrival times for two dimensional island arc structure[J]. Journal of Physical Earth, 1986,34(2): 195-201
4 Pratt R P. seismic waveform inversion in the frequency domain. Part 1: Theory and verification in a physical scale model[J]. Geophysics, 1999,64(3):888-901
5 Kosloff D, Sudman Y. Uncertainty in determining interval velocities from surface reflection seismics[J]. Ge- ophysics, 2002, 67(3) :952-963
6吴律．层析基础及其在井间地震中的应用[M]．北京: 石油工业出版社,1997．32-66
7杨文采．李幼铭．应用地震层析成像[M]．北京:地质出 版社,1993．1-48
8 Moser T J. Shortest path calculation of seismic rays [J]. Geophysics, 1991,56(1):59-67
9欧庆贤,韩震．王举红,等．立体地震法——开发地震中 的新工具[J]．石油物探,1998,37(4):13-31
10 陈国金,售辉,吴永栓,等．最短路径层析成像技术在井 间地震中的应用[J]．石油物探,2004,43(4):327-330
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