YUAN Mao-Lin1, JIANG Fu-You1, YANG Hong-Fei1, HE Xin1, WANG Jing-Bo1, HUANG Jian-Ping2
1.Sinopec Exploration Company,Chengdu 610041,China; 2.School of Geosciences Department of Geophysics,China University of Petroleum,Qingdao 266580,China
Abstract：Born approximation describes the primary scattering response of perturbed medium,which is the basis of linearized seismic inversion.Based on Born approximation,we derive the primary reflected wavefiled propagation formula by expressing the Green's function as a Gaussian-beam summation.The simulation of primary reflected waves is called Gaussian-beam linear forward modeling.On this basis,we perform numerical test by using the diffractors model,the glutenite model and the irregular surface model, and compare our results with those generated by wave equation modeling.Besides,we implement migration with corresponding synthetic seismograms generated by Gaussian-beam linear forward modeling.Numerical results indicate:First,Gaussian-beam linear forward modeling can accurately produce recorded data with multiple and the direct wave muted;Second,migration with synthetic seismograms generated by Gaussian-beam linear forward modeling can image corresponding subsurface structures;Third,target-oriented modeling can be carried out naturally.
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