THE FINITEELEMENT METHOD IN FORWARD PROBLEM OF VSP
Niu Binhua Gu xianming
This paper mainly introdes the finite element method in forward problem of VSP.It can be divided into two parts.First, from the theory of viscoelastic wave using the principle of calculus of variations, a new method for constructing the damping matrix is presented. The useful inquiry and study of forward problem in viscoelatic medium are by means of finite element method.In the second part, using the finite element method without the damping matrix, the model seismic records and VSP records in well are calculated. The typical modeling case is REYLEIGH surface wave on the earth surface.The VSP result is the same as the theoretical analysis.The VSP recirds of the constructure of horizontal layer, slope layer and ect are made. The zero-offset and nonzero-offset experiment, shallow shot point shotand nonsymmetrica shot are used in calcula-ting the VSP records.The super-compress storage, seperata block some messure are used in computing.The useful attepts are made for reducing the harsh conditions of storage and speed for computer of the finite element method.