基于薄层模型的有限频率井间地震波层析成像
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摘要
地震射线层析成像需要进行旅行时和射线路径的计算,而复杂介质的地震射线追踪方法受到地震波频率有限的影响。为此,提出了基于薄层模型的有限频率井间地震波层析成像方法。给出了方法的基本原理,即在Fresnel带内寻找长度最短的路径,在弯曲射线追踪方法表示旅行时大小的目标函数中,加入一项与射线长度有关的惩罚项,把有限频率地震射线追踪问题转化为求解该目标函数无约束最优化问题,从而实现基于薄层介质模型的有限频率地震射线追踪,最后通过反演计算实现井间地震射线层析成像。该方法计算简单,易于实现,理论模型试算验证了方法的有效性。
Seismic crosshole tomography is a key method for getting velocity profile of crosshole. Algebra reconstructs is widely used in seismic crosshole tomography,including ART and SIRT, but the travel time and path must be computed on tomography by ray tracing.In order to obtain the shortest path within Fresnel zone,based on the Bube's (2001) idea. we are constructed an unconstrained optimization function. add to penalty item involved ray length, that is related to the traveltimes of the path and realized ray tracing of finite frequency seismic wave, on thin bed layer model and realized the finite frequency seismic crosshole tomography. The algorithm is verified on theoretical model
Seismic crosshole tomography is a key method for getting velocity profile of crosshole. Algebra reconstructs is widely used in seismic crosshole tomography,including ART and SIRT, but the travel time and path must be computed on tomography by ray tracing.In order to obtain the shortest path within Fresnel zone,based on the Bube's (2001) idea. we are constructed an unconstrained optimization function. add to penalty item involved ray length, that is related to the traveltimes of the path and realized ray tracing of finite frequency seismic wave, on thin bed layer model and realized the finite frequency seismic crosshole tomography. The algorithm is verified on theoretical model
引文
1吴振利,李家彪,阮爱国,等．地震层析成像及其国内研 究进展[J]．东海海洋,2003,21(3):54-64
2宿淑春,王守东,吴律,等．井间层析成像的平滑SIRT 算法[J]．石油大学学报(自然科学版)[J]．2001,25(6): 29-31
3孔庆丰,左建军,陈世军,等．井间直达波层析成像的井 斜校正研究与应用[J]．石油地球物理勘探,2004,39 (1):12-16
4陈国金,曹辉,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(7):327-330
5陈世军,周建宇,王延光,等．井间地震技术在樊124井 区中的应用[J]．石油物探,2003,42(3):369-373
6陈世军,刘洪,周建宇,等．井间地震技术的现状与展望 [J]．地球物理学进展,2003,18(3):524-529
7裴正林．井间地震层析成像的现状与进展[J]．地球物理 学进展,2001,16(3):91-97
8张建中,陈世军．复杂介质地震初至波数值模拟[J]．计 算物理,2003,20(5):429-433
9张建中,陈世军,余大祥．最短路径射线追踪方法及其 改进[J]．地球物理学进展,2003,18(1):146-150
10张永刚．地震波场数值模拟方法[J]．石油物探,2003, 42(2):143-148
11 Cerveny V, Soares J E P. Fresnel volume ray tracing [J].Geophysics, 1992, 57(7):902-915
12 Bube K P, Washbourne J K. Wavetracing: ray tracing for the propagation of band-limited signals:partl-theory [J]. Expanded Abstracts of 71st Annual Internat SEG Mtg,2001, 1 131-1 134
2宿淑春,王守东,吴律,等．井间层析成像的平滑SIRT 算法[J]．石油大学学报(自然科学版)[J]．2001,25(6): 29-31
3孔庆丰,左建军,陈世军,等．井间直达波层析成像的井 斜校正研究与应用[J]．石油地球物理勘探,2004,39 (1):12-16
4陈国金,曹辉,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(7):327-330
5陈世军,周建宇,王延光,等．井间地震技术在樊124井 区中的应用[J]．石油物探,2003,42(3):369-373
6陈世军,刘洪,周建宇,等．井间地震技术的现状与展望 [J]．地球物理学进展,2003,18(3):524-529
7裴正林．井间地震层析成像的现状与进展[J]．地球物理 学进展,2001,16(3):91-97
8张建中,陈世军．复杂介质地震初至波数值模拟[J]．计 算物理,2003,20(5):429-433
9张建中,陈世军,余大祥．最短路径射线追踪方法及其 改进[J]．地球物理学进展,2003,18(1):146-150
10张永刚．地震波场数值模拟方法[J]．石油物探,2003, 42(2):143-148
11 Cerveny V, Soares J E P. Fresnel volume ray tracing [J].Geophysics, 1992, 57(7):902-915
12 Bube K P, Washbourne J K. Wavetracing: ray tracing for the propagation of band-limited signals:partl-theory [J]. Expanded Abstracts of 71st Annual Internat SEG Mtg,2001, 1 131-1 134
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