再论各向异性介质转换波地震学,第一部分:理论 |
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作者单位: | Xiangyang Li and Jianxin Yuan British Geological Survey,West Mains Road,Edinburgh EH9 3LA,UK. Formerly at British Geological Survey; now at PGS Inc.,10550 Richmond Avenue,Suite 300,Houston,TX 77042,USA. |
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摘 要: | 我们业已研发了计算各向异性、非均质介质中P- SV转换波(C-波)的转换点和旅行时的新理论。据此 可以利用诸如相似性分析、迪克斯模型建模、克契 霍夫求和等常规方法来完成各向异性的处理和各向 异性处理,并使各向异性的处理成为可能。这里将 我们的新发展分作两部分来介绍。第一部分为理 论,第二部分为对速度分析和参数计算的应用。第 一部分理论包括转换点的计算和动校正的分析。
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关 键 词: | 转换波 各向异性 模型 动校正 速度 震学 旅行时 |
Converted-wave Seismology in Anisotropic Media Revisited, Part Ⅰ: Basic Theory |
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Authors: | Xiangyang Li and Jianxin Yuan British Geological Survey West Mains Road Edinburgh EH LA UK Formerly at British Geological Survey now at PGS Inc Richmond Avenue Suite Houston TX USA |
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Institution: | Xiangyang Li and Jianxin Yuan British Geological Survey,West Mains Road,Edinburgh EH9 3LA,UK. Formerly at British Geological Survey, now at PGS Inc.,10550 Richmond Avenue,Suite 300,Houston,TX 77042,USA. |
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Abstract: | We have developed new basic theories for calculating the conversion point and the travel time of the P-SV converted wave (C-wave) in anisotropic, inhomogeneous media. This enables the use of conventional procedures such as semblance analysis, Dix-type model building and Kirchhoff summation, to implement anisotropic processing, and makes anisotropic processing affordable. Here we present these new developments in two parts: basic theory and application to velocity analysis and parameter estimation. This part deals with the basic theory, including both conversion-point calculation and moveout analysis. Existing equations for calculating the PS-wave (C-wave) conversion point in layered media with vertical transverse isotropy (VTI) are strictly limited to offsets about half the reflector depth (an offset-depth ratio, x/z, of 0.5), and those for calculating the C-wave traveltimes are limited to offsets equal to the reflector depth (x/z=1 .0). In contrast, the new equations for calculating the conversion-point extend into offsets about three-times the reflector depth (x/z=3.0), those for calculating the C-wave traveltimes extend into offsets twice the reflector depth (x/z=2.0). With the improved accuracy, the equations can help in C-wave data processing and parameter estimation in anisotropic, inhomogeneous media. |
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Keywords: | converted wave anisotropy model moveout velocity seismology and travel time |
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