Eikonal equation-based adjoint-state characteristic reflection traveltime tomography: Method and application in real dataset

• DOI: 10.1190/image2023-3905696.1
• Publication Date: 2023-12-14T20:36:35Z
• Authors: Jianming Zhang; Liangguo Dong; Jianhua Wang; Yilin Wang; Chao Huang
• Keywords: Reflector (photography); Reflection

The conventional adjoint-state reflection traveltime tomography (ASRT) method based on the Eikonal equation is limited with respect to two aspects: first automatically picking traveltimes in prestack seismic data, and other determining updating reflector positions during inversion. To solve these problems, we propose an adjoint state characteristic (ASCRT) reconstruct subsurface velocity model. This extracts pre-stack data by combining Eikonal-equation-based calculation a reliable shift estimation using initial model reflector. shifts are effectively tracked crosscorrelation between observed demigrated reflections corresponding eliminates need for tedious manual ultimately improves automatic extraction accuracy. efficiently determine update positions, efficient kinematic imaging developed. In each iteration of inversion, above alternately updated. more adaptable practice compared fixed ASRT. Compared wave-equation-based inversion methods, efficiency ASCRT improved several orders magnitude, memory consumption remarkably reduced. practical applications, building accuracy through layer-stripping strategy, which sequentially uses multiple reflectors from shallow deep.