摘要
地震波旅行时计算是Kirchhoff积分法叠前深度偏移成像的核心内容，其精度决定着最终偏移成像的效率和效果;另外，在射线理论正演中，旅行时计算的精度也决定着其振幅计算的准确程度。因此，它受到众多学者的关注。针对目前最典型的几种地震波旅行时计算方法（如平面波的有限差分法、线性插值法等），本文从本质上比较了它们之间的差异与相同之处，指出了各自的特点及适用范围。文章重点讨论了球面波近似旅行时计算方法，并弥补了Schneider（1992）算法在实现方法上的不足。最后通过模型试算，验证了球面波近似算法及平面波近似算法在层析成像中的效果。
The computation of seismic travel time is a core matter of prestack depth migration using Kirchhoff integration, and its accuracy decides the efficiency and effect of final migration. In addition, in theoretical forward of seismic ray, travel time accuracy determines amplitude accuracy. Therefore, multitudinous geophysicists pay attention to travel time accuracy.Having analysed and compared several typical methods for travel time computation (finite difference method, linear interpolation method and so on ), authors details their respective advantages and application spheres. The approximate estimation method for spherical-wave travel time is discussed in detail, and Schneider method is improved in its realization procedure. Modeling computation proves respectively the tomographic effects of approximate methods for estimating travel times of spherical wave and plane wave.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1999年第2期155-163,共9页
Oil Geophysical Prospecting
基金
国家自然科学基金
大庆石油管理局联合资助
关键词
地震波旅行时
计算精度
地震勘探
地震数据
seismic travel time, plane wave approximation, spherical wave approximation, linear interpolation, ray tracing, computation accuracy
