A 3D full waveform inversion method based on reconstructed source wavelet with wave equation
Liang Zhanyuan1, Wu Guochen1, Wang Yumei2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Research Institute of Geophysics, Shengli Oilfield Branch Co., SINOPEC, Dongying, Shandong 257022, China
Abstract：We propose in this paper a 3D full waveform inversion method based on reconstructed source wavelet with wave equation.We resolve the wave equation with direct waves obtained from near offsets of prestack shot gathers as boundary conditions and take time series at the source point as source wavelet.This method uses the principle of seismic source wave field reconstruction to simulate the inverse process of the wave propagation along the surface,and extracts direct waves at near offsets,which avoids the interference such as refraction wave,reflection wave and diving wave.So the method has less dependence on the initial model.For tests,we select the 3D SEG/EAGE overthrust model and field data to analyze the phase difference of 3D seismic wavelet based on the source wavefield reconstruction theory of wave equation.Test results show that there is only phase difference between the reconstructed wavelet and the input wavelet.After the phase adjustment,the reconstructed wavelet is used for the 3D full waveform inversion; the inversion velocity is close to the real one.Results are more reliable for channels.The waveform and phase between observed records and simulated records have also good correspondence,which validates the feasibility and applicability of the proposed method.
梁展源, 吴国忱, 王玉梅. 基于波动方程重建震源子波的三维全波形反演[J]. 石油地球物理勘探, 2017, 52(6): 1200-1207.
Liang Zhanyuan, Wu Guochen, Wang Yumei. A 3D full waveform inversion method based on reconstructed source wavelet with wave equation. Oil Geophysical Prospecting, 2017, 52(6): 1200-1207.
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