On the Vertical Seismic profiling in Borehole Geophysics

垂直地震剖面(VSP)是基于井眼的勘探技术之一。VSP中的特殊问题是管波和转换波。例如，这些波在井眼的不连续处和地层的断裂区产生。本课题通过实验缩尺模型对管波的物理行为进行了观测和分析。采用二维聚碳酸酯平板模型。尽管该模型的物理条件与实际场的物理条件不同，但可以清楚地观察到管波的相似行为。然后假设了地震层析成像的各种震源-接收模式，并对管波进行了实验模拟和分析。结果表明，这种实验模型是研究这些干扰波的最佳方法之一。

Vertical Seismic Profiling(VSP) is one of the borehole based exploration techniques. Particular problems in VSP are tube waves and converted waves. These waves, for examples, generate at the discontinuities of the borehole and the fracture zone of the layer. In this project, physical behaviors of tube waves are observed and analyzed through experimental scale models. A two dimensional polycarbonate plate model is used. Though physical conditions of this modee is different from that of actual field, similar behaviors of the tube waves are clearly observed. Then various source-receiver patterns for seismic tomography are assumed, and the tube waves are experimentally simulated and analyzed. As the results, this kind of experimental model proved to be one of the best methods to study these distutbing waves.