Analysis Of Well-seismic Data Matching Basing On Numerical Simulation Of Equivalent Anisotropic

With the continuous development of seismic exploration technolo gy,complex structure reservoir is becoming a hot spot for exploration.Complex,multiscale seismic exploration technology has become the development trend.Seismic numerical modeling is the important foundation of seismic exploration and seismology.Firstly,assuming the structure of underground medium model and the corresponding physical parameters are known.Then simulate seismic wave propagation in all kinds of underground media.In data processing,it can effectively test the correctness of the inversio n methods and obtain the law of wave propagation.N umerical simulation has been developing rapidly,in many ways,and finite difference method is one of the commonly used methods of numerical simulation.In addition,as the development of multidisciplinary,multiple methods and integrated application,the combination of well logging and seismic data is indispensable in oil and gas exploration and development and prediction of reservoir lithology,physical property and oil content.Seismic data is limited in the time domain,the well logging data is limited in depth domain.And these determine well-seismic matching is a bridge connecting well logging and seismic information.The accuracy of matching directly decides the accuracy of seismic inversion.Therefore,pursuing the maximum correlation of well logging and seismic information is the key.Especially the objective layer must be calibrated precisely.Firstly,this paper has introduced the classification of the anisotropic medium,Thomsen parameters and the stiffness matrix.And then from TI medium,Backus and Hudson two equivalent theories are introduced.Later,through the finite difference method,we realize numerical simulation of Qp wave and migration imaging and improve calculation efficiency of small scale numerical simulation of seismic wave effectively by means of improvement of varying grid technology.Also we have discussed the influence factors of reverse-time migration,and apply stochastic boundary in the Qp wave numerical modeling.Finally,by logging data modeling,we obtain the Qp wave and sonic wave migration sections,and analyse the influence of anisotropy on well-seismic matching,and other factors affecting the accuracy of matching.