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本文通过应用地震层析成像(CT)技术,对跨孔成像法采集得到的初至波走时,用基于最短路径法的弯曲射线追踪正演和基于LSQR算法的反演技术进行处理。与测井资料联合解释,得到井间波速分布图,对井控范围内的地层构造和地基注浆效果进行了研究,最终得到断裂构造带和人防空洞的分布。认为地震CT在进行城市环境地质调查与评价、浅层工程地质勘察时,能够解决地层岩性和构造的复杂性,对目标环境进行准确预测,在城市环境地质研究和基础设施建设中起重要作用,对促进城市地球物理勘察技术的发展有重要意义。
In this paper, we use the seismic tomography (CT) technique to deal with the first-arrival wave propagation time acquired by the cross-bore imaging method with the forward-curved ray-ray tracking method based on the shortest path method and the inversion technique based on the LSQR algorithm. And interpretation of logging data, the cross-well wave velocity distribution map is obtained, and the stratigraphic structure and grouting effect in the well control area are studied. Finally, the distribution of the fault structure zone and air defense shelters is obtained. It is considered that the seismic CT can solve the lithology and structural complexity of the strata during the investigation and evaluation of urban environmental geology and the shallow engineering geological survey and accurately predict the target environment and play an important role in the research of urban environmental geology and infrastructure construction , To promote the development of urban geophysical survey technology is of great significance.