超浅层三维地震勘探技术应用

为了检验超浅层三维地震勘探技术对城市复杂环境下工程勘察目标的探测能力,在上海市某公路上对地下隧道进行超浅层三维地震探测试验.设计具有较高施工效率的密集炮点排列的超浅层三维地震数据采集观测系统,利用omega地震数据处理软件对超浅层三维地震数据进行带通滤波、FX线性干扰压制、振幅补偿、反褶积、速度分析和叠加等处理,最后对超浅层三维地震叠加数据体进行三维可视化解释.结果表明,在地震叠加剖面上可以清晰看到超浅层地层界面的反射,由超浅层地震三维数据体能够推断出地下隧道的分布范围.

Application on ultra-shallow 3D seismic exploration technology

In order to investigate the application effect of ultra shallow 3D seismic exploration method under the noisy environment of urban condition, an ultra shallow 3D seismic survey was carried out to testify a subway tunnel under a traffic road in Shanghai, China. The ultra shallow 3D seismic data was collected using a kind of special 3D seismic data acquisition layout with dense shots and the seismic data acquisition efficiency was increased. Then the seismic data processing software named Omega was used to process the 3D ultra shallow seismic data. The main processing methods included Band-pass filter, F-X domain Linear noise suppress, amplitude compensation, de-convolution, velocity analysis, CDP stack and so on. At last, the 3D seismic dataset was displayed and analyzed using the 3D visual software. The results show that the seismic reflection event of interface between ultra shallow stratums can be seen from stack profiles. Moreover, the distribution of the subsurface subway tunnel can be identified from ultra-shallow 3D seismic investigation．