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題名 | Traveltime Analysis of VSP Seismograms in a Horizontal Transversely Isotropic Medium: A Physical Modeling Result=VSP震波訊號於水平橫向非均向性介質的走時分析:物理模型結果 |
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作者 | 張永孚; 張智雄; Chang, Young-fo; Chang, Chih-hsiung; |
期刊 | Terrestrial, Atmospheric and Oceanic Sciences |
出版日期 | 20011200 |
卷期 | 12:4 2001.12[民90.12] |
頁次 | 頁685-693 |
分類號 | 354.4 |
語文 | eng |
關鍵詞 | VSP震波訊號; 水平橫向非均向; 物理模型; Anisotropy; Vertical seismic profile; Physical modeling; |
英文摘要 | In order to investigate the effects of anisotropy in a VSP survey, the multi-component VSP data for observing the qP-, qSH- and qSV-waves were collected with two different source-to-well offsets in an elastic transversely isotropic medium (TIM) with a horizontal symmetry axis (HTI). The traveltimes of the events were then computed using two different algorithms: first with elastic constants of the medium, and second with "isotropic velocities". Comparing the traveltimes of computations with the recorded data, a very clear and important consequence can be derived. For strongly anisotropic media (the anisotropy for the qP-and qS-waves are 25% and 29%, respectively, in our laboratory work), the effects of anisotropy increase with increasing source-to-well offset. As the source-to-well offset is small compared with the depth of the receiver (offset/depth ≦ 0.2 in our work), the effects of anisotropy canbe ignored. However, in processing a large source-to-well offset VSP survey (offset/depth ≧ 0.35 in this study), special attention must be paid on the effects of anisotropy. |
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