We recognized that the envelope fluctuation and decay of seismic records carries ultra low-
frequency (ULF, ie, the frequency below the lowest frequency in the source spectrum) …

The availability of low-frequency data is an important factor in the success of full-waveform
inversion (FWI) in the acoustic regime. The low frequencies help determine the kinematically …

Waveform inversion met severe challenge in retrieving long‐wavelength background
structure. We have proposed to use envelope inversion to recover the large‐scale …

早期地震偏移的目标是通过寻找地下反射面的位置来落实井位. 经过半个多世纪的发展,
地震偏移技术日趋精深. 特别是随着叠前深度偏移的广泛应用, 地震偏移结果为解释人员进行 …

Full waveform inversion (FWI) reconstructs the underground velocity structures by
minimizing the data residual between calculated wavefields and observed wavefileds. The …

本文提出解调包络方法来重构地震记录中缺失的低频信号, 同时该方法能够降低全波形反演的非
线性程度; 提出伴随状态震源函数反演方法来得到精确的震源函数, 并推导了梯度计算公式; …

为了实现包络反演, 需要通过一种非线性运算来提取信号包络. 这种非线性的包络提取过程可以
将信号包络中所包含的对介质扰动的大尺度响应从原始地震信号中分离出来 …

时域全波形反演由于采用了全频段信息, 因此在迭代过程中不同波长的信息不能由低到高的逐步
重建, 极易陷入局部极小值. 本文通过分频段的方式, 对地震数据做正反傅里叶变换 …

Seismic envelope inversion (EI) uses low-frequency envelope data to recover long-
wavelength components of the subsurface media. Conventional EI uses the same waveform …

Elastic full-waveform inversion (EFWI) attempts to find high-resolution model parameters that
are able to match observed data exactly by minimizing residuals between the observed and …