摘要
通过对目标函数求导的方式详细推导了时间域全波形反演的梯度公式,并使用共轭梯度法同时迭代介电常数和电导率。将该方法应用到一组合成数据和实际数据中,合成数据结果表明全波形反演能够准确刻画地层结构,精确重建亚波长尺寸异常体的位置和参数信息。实际数据的反演结果证明全波形反演能够反映地层中的细微结构,提供高分辨率的反演结果,其波形比配结果也更准确。
Gradient formula is obtained by taking the derivative of the object function with respect to the model parameter. And permittivity and conductivity are simultaneously updated by using the conjugate gradient method.Then we apply FWI to a group of synthetic and field data,and the results of synthetic data show that FWI can accurately reconstruct the value and shape of the layers and sub-wavelength anomalous bodies. Results of filed data turn out that small subsurface features can be imaged and the resolution is high in the full waveform tomograms.
出处
《世界地质》
CAS
2016年第1期256-263,共8页
World Geology
基金
国家高技术研究发展计划(2013AA064603)
国家自然科学基金(40874073&41074076)联合资助
关键词
全波形反演
介电常数
电导率
跨孔雷达
full waveform inversion
permittivity
conductivity
cross-hole radar
