Method And Implementation Of Multi-wave Velocity Analysis In Anisotropic Media

Velocity analysis acts as an important function in seismic exploration. However on the assumption that the layers are isotropic, it appears insufficiency when it needs higher precise exploration. Anisotropy makes it insufficiency to get the vertical velocity by the conventional hyperbolic approximation for short-spreads. The precise of velocity analysis is controlled by the approximation formulas of moveout curve and the analysis method. So when the layers have the anisotropic properties, seismic wave's velocity and moveout will become complex. It needs to acquire the anisotropic moveout formulas and the connection of layers parameters with velocity. Then using multi-wave information sufficiently to analyse the seismic data. According to hake(1984) research mentality, approaches the method to the anisotropic media polar plot to be possible to sum up is two kinds: One kind is the method which carries on to the converted wave non-hyperbolic curve approaches: The double square root equation (DSR) law, this kind of method is high to the long offset data precision, but its computation dependence longitudinal wave data. Moreover one method is the higher order taylor series method of development, this method has certain limit to the spread length, after makeing the improvement to it, may cause its compatible increase, Useing taylor series expansion and the pair of square equation polar plot formula separately, In the realization anisotropic media P-P affects P-SV the wave velocity analysis.Visualization of science and technology is an important research direction andnew area of computer graphics. It can help the engineers to penetrate the inner meaning of the data and reveal and understand the extension principles with visual and intuitionistic way.On the basis of literatures appeared, for the vertical transverse isotropy layers, firstly learn the hyperbolic approximation formula about the reflection moveout on short-spreads; secondly derivate the non-hyperbolic approximation formula about the reflection moveout on intermediate-spreads and long-spreads detailedly. Gain the high precise formula about P wave, S wave and Converted wave. At the same time get the connection of layer's anisotropic parameters with moveout curve and velocity by the numbers, according to the formula and with the software development tool QT , this issue mainly realized the 3 dimension p-p wave stack velocity modeling both on isotropic and anisotropic properties, realized the 3 dimension double square root P-SV wave velocity modeling both on isotropic and anisotropic properties, realized the 3 dimension C-method velocity modeling both on isotropic and anisotropic properties. The software discussed in this paper based on multi-wave velocity analysis method had been developed with the software development tool QT, and this software has been used in production and has broad prospect.