A multi-operator combination simulated imaging method based on coarse grid
For models with known velocities,traditional pre-stack depth migration imaging methods aim to quickly obtain high precision profiles.The pre-stack depth migration imaging method based on the ima-ging operator can quickly obtain the migration results without the forward modeling and migration processing of the wave field,but the imaging operator is constructed according to the scattering vector of a single scattering point,and can only accurately simulate the local area near the scattering point.In order to improve the authen-ticity of the direct simulated imaging results and take into account the advantages of high computational effi-ciency of direct simulated imaging,the coarse point diffusion operator is established under the premise of the coarse mesh discrete original velocity model,and different interpolation methods are tested on the coarse point diffusion operator in the wavenumber domain to test the influence of different scales of coarse mesh and different interpolation methods on the simulated imaging results.On this basis,a multi-operator cooperative simulated imaging is proposed,in which multiple local migration imaging windows are set up,scattering points are ar-ranged in each window and the ray path is calculated,and the imaging operator for controlling the local imaging is constructed in the partition,so that the simulated imaging results can better reflect the influence of the acquisi-tion geometry on the theoretical imaging results of different regions.This method not only retains the high com-putational efficiency of fast imaging,but also obtains the imaging operator that controls local imaging,which can simulate the theoretical simulated imaging results of different regions under the same acquisition geometry and detect the influence of the acquisition geometry on global imaging,which can directly demonstrate the con-trol of the acquisition geometry on theoretical imaging in different regions.
direct simulated imagingcoarse gridinterpolated point diffusion operatormulti operator collabora-tionlocal migration imaging window
万方数据
维普
