地震映像剖面数值模拟研究
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摘要
研究目的:在铁路勘探过程中,经常遇到采空区、软弱层等不良地质因素。对上述不良地质现象,地震映像法是一种有效的勘探方法。地下介质的复杂性决定了野外地震映像法采集波场资料的复杂性,资料解释和异常判别困难,有时甚至使方法失效。识别有效信号和干扰信号,可以提高资料的解释精度。研究结论:通过对实际模型的试算,有效地模拟了地震映像剖面。模拟剖面可以看到显著的物探异常,有效地反映了复杂结构中的波场形态和特征。研究表明,有限差分数值模拟不仅允许速度纵向变化,而且允许速度横向变化,更适用于实际模型,是一种行之有效的共偏移距剖面数值模拟方法。通过研究,可以更加准确地判定异常的空间位置和形态,提高探测精度,对实际的解释工作具有一定的指导意义。
Research purposes:In railway exploration process,we are often caught by bad geological factors such as goaf,softlayer,etc.Under these unfavorable geological conditions,the seismic imaging method is an effective exploration method.The complexity of subsurface collection determines the complexity of the seismic wave field.The difficult of data interpretation and anomaly discrimination leads to the method fails sometimes.To differentiate effective signal and interference signals can improves the accuracy of data interpretation. Research conclusions:With the actual physical parameters,we effectively simulated the seismic imaging profile.On modeling profile,we can see a significant geophysical anomaly,effectively reflecting the complex structure of the wave field in the shape and characteristics.The finite-difference numerical simulation method allows speed to change vertically and laterally,and better used on actual model.It's effective for modeling common-offset profile.Through research,we can more accurately determine the anomaly location and shape,and improve the exploring precision.It has a certain significance to the interpretation of actual work.
Research purposes:In railway exploration process,we are often caught by bad geological factors such as goaf,softlayer,etc.Under these unfavorable geological conditions,the seismic imaging method is an effective exploration method.The complexity of subsurface collection determines the complexity of the seismic wave field.The difficult of data interpretation and anomaly discrimination leads to the method fails sometimes.To differentiate effective signal and interference signals can improves the accuracy of data interpretation. Research conclusions:With the actual physical parameters,we effectively simulated the seismic imaging profile.On modeling profile,we can see a significant geophysical anomaly,effectively reflecting the complex structure of the wave field in the shape and characteristics.The finite-difference numerical simulation method allows speed to change vertically and laterally,and better used on actual model.It's effective for modeling common-offset profile.Through research,we can more accurately determine the anomaly location and shape,and improve the exploring precision.It has a certain significance to the interpretation of actual work.
引文
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[6]周学明,李庆春,李志华,等.地震波交错网格高阶差分数值模拟研究[J].铁道工程学报,2011(8):1-6.Zhou Xueming,Li Qingchun,Li Zhihua,etc.Researchon Staggered-grid High-order Finite-differenceNumerical Simulation of Seismic Wave[J].ChineseJournal of Geophysics,2011(8):1-6.
[7]Chen,Y.H.,Chew,W.C.,and Oristaglio,M.L.Application of Perfectly Matched Layers to theTransient Modeling of Subsurface EM Problems[J].Geophysics,1997(6):1730-1736.
[8]Chew,W.C.,and Weedon,W.H.A 3-D PerfectlyMatched Medium from Modified Maxwell’s Equationswith Stretched Coordinates[J].Microwave and OpticalTechnology Letters,1994(13):599-604.
[2]徐贵来.地震映像勘探技术研究[J].世界核地质科学,2006(1):33-37.Xu Guilai.Technical Development of Seismic ImagingProspecting[J].World Nuclear Geoscience,2006(1):33-37.
[3]张致付,程志平.物探方法在探测岩溶构造中的应用[J].桂林工学院学报,2003(1):41-45.Zhang Zhifu,Cheng Zhiping.Application of GeophysicalMethods in Exploring Karst Structure[J].Journal ofGuilin Institute of Technology,2003(1):41-45.
[4]Alford R M.Accuracy of Finite Difference Modeling ofTheacoustic Wave Equation[J].Geophysics,1974(6):834-842.
[5]董良国,马在田,曹景忠,等.一阶弹性波方程交错网格高阶差分解法[J].地球物理学报,2000(3):411-419.Dong Liangguo,Ma Zaitian,Cao Jingzhong,etc.AStaggered-grid High-order Difference Method of One-order Elastic Wave Equation[J].Chinese Journal ofGeophysics,2000(3):411-419.
[6]周学明,李庆春,李志华,等.地震波交错网格高阶差分数值模拟研究[J].铁道工程学报,2011(8):1-6.Zhou Xueming,Li Qingchun,Li Zhihua,etc.Researchon Staggered-grid High-order Finite-differenceNumerical Simulation of Seismic Wave[J].ChineseJournal of Geophysics,2011(8):1-6.
[7]Chen,Y.H.,Chew,W.C.,and Oristaglio,M.L.Application of Perfectly Matched Layers to theTransient Modeling of Subsurface EM Problems[J].Geophysics,1997(6):1730-1736.
[8]Chew,W.C.,and Weedon,W.H.A 3-D PerfectlyMatched Medium from Modified Maxwell’s Equationswith Stretched Coordinates[J].Microwave and OpticalTechnology Letters,1994(13):599-604.
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