网格尺度对走时层析成像结果的影响分析及对策
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摘要
基于网格剖分的走时层析算法反演地下地质结构,在地震走时数据采集精度确定、炮点接收点固定的条件下,要选择一个适当的网格尺度.本文分析了不同网格尺度对层析结果精度的影响,网格尺度过大,走时层析算法不能准确反演地下地质结构;网格尺度过小,反演结果包含过多插值的结果,反演精度不高,且会增加工作量和研究时间,对层析成像无实际意义.因此选择合适的网格尺度对层析成像结果的精度和算法的计算效率都有意义.本文以实际地质勘探为例,根据炮点接收点的位置对走时层析成像的影响,选取走时层析成像算法的最佳网格尺度.
An appropriate choice should be make about the scale of grid under the conditions that the seismic travel time data acquisition accuracy is certain and the shot point and receive point is fixed.This paper analyzes the different grid scale's influence on the accuracy of tomography results,and considers that if the grid scale is too large,the travel time tomography algorithm cannot be able to inverse of the correct subsurface geological structure,but if the grid scale is too small,the inversion results are imprecise in that there are too many interpolation data,and it will increase the calculated amount and time,that is meaningless to the tomography.Therefore,it is significative to choose an appropriate grid scale which can improve the precision of inversion results and computational efficiency.This paper takes the real geological exploration data as example,according to the affection of the position of the receiving point and the shot point on travel time tomography.And then choose the best grid scale to apply in the real geology travel time tomography.
An appropriate choice should be make about the scale of grid under the conditions that the seismic travel time data acquisition accuracy is certain and the shot point and receive point is fixed.This paper analyzes the different grid scale's influence on the accuracy of tomography results,and considers that if the grid scale is too large,the travel time tomography algorithm cannot be able to inverse of the correct subsurface geological structure,but if the grid scale is too small,the inversion results are imprecise in that there are too many interpolation data,and it will increase the calculated amount and time,that is meaningless to the tomography.Therefore,it is significative to choose an appropriate grid scale which can improve the precision of inversion results and computational efficiency.This paper takes the real geological exploration data as example,according to the affection of the position of the receiving point and the shot point on travel time tomography.And then choose the best grid scale to apply in the real geology travel time tomography.
引文
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[2]Asakawa E,Kanawa T.Seismic ray tracing using line-ar traveltime interpolation[J].Geophysical Prospec-ting,1993,41(1):99-111.
[3]张东,乔友峰,姜麟舜,等.地震层析成像中LSQR算法的快速求解[J].物探化探计算技术,2011,33(6):632-635.Zhang Dong,Qiao Youfeng,Jiang Linshun,et al.Fastimplementation of LSQR algorithm in seismic inversion[J].Computing Techniques for Geophysical and Geo-chemical Exploration,2011,33(6):632-635(Ch).
[4]Samyn K,Travelletti J,Bitri A,et al.Characteriza-tion of landslide geometry using 3Dseismic refractiontraveltime tomography[J].EGU General AssemblyConference Abstracts,2012,14:2329.
[5]赵连锋,朱介寿,曹俊兴.并行化交错网格法地震层析成像[J].石油物探,2003,42(1):6-8.Zhao Lianfeng,Zhu Jieshou,Cao Junxing.Seismictomography with parallel interlaced gridding[J].Geo-physical Prospecting For Petroleum,2003,42(1):6-8(Ch).
[6]Kissling E,Husen S,Haslinger F.Model parametriza-tion in seismic tomography:A choice of consequencefor the solution quality[J].Physics of the Earth andPlanetary Interiors,2001,123(2):89-101.
[7]Zhou H.Multiscale traveltime tomography[J].Geo-physics,2003,68(5):1639-1649.
[8]Zhou H.Multiscale deformable-layer tomography[J].Geophysics,2006,71(3):11-19.
[9]马德堂,朱光明,张文波.双重网格井间地震层析成像技术[J].地球科学与环境学报,2006,27(4):83-86.Ma Detang,Zhu Guangming,Zhang Wenbo.Doublemesh well seismic tomography[J].Journal of EarthSciences and Environment,2005,27(4):83-86(Ch).
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