The Study Of Velocity Analysis Method To Extract Anisotropic

Traditional seismic exploration is mainly based on the assumption that the medium of Earth is homogeneous and isotropic,but in the actual formation,seismic anisotropy is widespread.In order to improve the precision and accuracy of seismic data processing and interpretation,study of seismic anisotropy has gradually become one of geophysical research in the field of cutting-edge topics.Velocity analysis is an important step in seismic data processing,the traditional velocity analysis are based on the assumption of isotropic medium,with the development of exploration precision request enhancement,anisotropic velocity analysis of seismic data processing and interpretation of have important practical significance.Firstly,the paper elaborates the theory of anisotropic in detail,such as the formation mechanism of anisotropy and classification,anisotropic elastic wave equations are derived,and describes the anisotropy parameters to characterize the form and anisotropy of the medium phase and group velocity relationship and expression.This paper introduces the basic principle of the conventional velocity analysis method,And detailed discussion of several algorithms and criterion analysis method,on this basis,the production process introduced widely velocity spectrum.And the establishments of a theoretical model to disuse several velocity analysis methods.On the basis of the conventional velocity analysis,the paper describes in detail NMO velocity derived formula under anisotropic media,and introduces derived in anisotropic media non-hyperbolic moveout equations.Studied the use of non-hyperbolic equations Alkhalifah anisotropic velocity analysis,with production speed spectral method of making Eta spectrum,thereby extracting accurate anisotropy parameters.On this basis,I program to extract pre-stack gathers Eta spectrum of software modules,and the actual data processing to get good results.On the basis of in-depth study of anisotropic velocity analysis,studied by methods to improve signal to noise ratio and resolution of seismic data,to improve the stability and accuracy of the actual data extraction anisotropy parameters.I've written two methods of software modules to achieve the effect.Both methods have good results in the actual data.