并行积分法叠前时间偏移的几个问题
摘要
分析了并行积分法叠前时间偏移涉及的旅行时计算方法、振幅加权因子、反假频、并行结构和效率等几个重要问题,并进行了各种偏移试验,对比了不同参数的偏移结果,指出了偏移处理中需要注意的一些问题。试验结果表明,在构造比较复杂的部份,弯曲射线旅行时取得了比直射线旅行时更好的偏移效果;Schleicher振幅加权因子对积分法叠前时间偏移的共成像点道集上见到了一定的效果;算子的倾角和时间剖面上地震同相轴的倾角是一个含义,它和孔径直接相联系,即小孔径意味着小倾角,大孔径意味着大倾角,孔径太小相当于算子截断,相当于对偏移结果进行了倾角滤波;对目前流行的PC-Cluster系统而言,由于内存是分布在各个节点上的,输入道模式是并行的唯一选择。
引文
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[2]CAUSSE E,HAUGEN G U,ROMMEL B E.Large-offset ap-proxi mation to seismic reflection travelti mes[J].Geophysical Prospecting,2000,48:763-778.
[3]CHUANWEN SUN,RUBEN D.Amplitude preserving3D pre-stack Kirchhoff ti me migration forv(z)and VTI media[C].SEG International Exposition and72nd Annual Meeting,2002.
[4]RAY ABMA,JAMES SUN,NICK BERNITSAS.Antialiasing methods in Kirchhoff migration[J].Geophysics,1999,64(6):1783-1792.
[5]SCHLEICHER J,TYGEL M,HUBRAL P.3-D true amplitude finite-offset migration[J].Geophysics,1993(8):1112-1126.
[6]TANER M T,KOEHLER F.Velocity spectra-digital computer derivation and application of velocity functions[J].Geophysics,1969,34:859-881.
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