扩展成像条件下的全波形反演方法研究与应用OA

Full waveform inversion(FWI)is widely applied in the field of petroleum and natural gas exploration.However,traditional FWI based on the cross-correlation imaging condition suffers from low inversion accuracy,as it fails to effectively incorporate the velocity information around imaging points and thus cannot meet the higher requirements of hydrocarbon exploration.To address this issue,based on the idea of the extended model,the cross-correlation extended imaging condition for the source wavefield and receiver wavefield is derived in the frequency domain.Combined with the optimization constraint condition of differential similarity,a novel FWI method under the extended imaging condition is proposed.Theoretical model calculations and field data applications demonstrate that the proposed method can effectively improve the accuracy and stability of velocity inversion in complex structural areas and meet the demands of hydrocarbon exploration.