Based On The Wave Equation Finite Difference Method To Achieve Intended Vsp And 3d Display

The conversion of surface data into pseudo VSP record is a valid method which can fully use the VSP's advantage and avoid the surface exploration's disadvantage. This conversion is based on the analytic expression of sonic and elastic wave equation, and use the different wave field extrapolation, which is initially used in seismic migration and forward modeling. This paper introduces the easy and efficient finite-difference method to realize the conversion by comparing three different methods. When discreting the sonic and elastic analytic equation, the paper shows different finite-difference forms of sonic and center finite-difference form of elastic by detailed deriving in different situation. At the same time, the paper discusses the finite-difference's stability and the boundary conditon of gridding region, then lists the final sonic and elastic finite-difference expression which can realize forward modeling and inverse in computer by programming. In order to view the results of computing in effect, the paper alse discusses the three dimension visualization . Due to the OpenGL's ability and efficiency in 3-D program, the paper discusses the theory of OpenGL in detailed, simultaneously discusses the programming process and realizing method. By use of the 3-D display tool, We can combinate the different results of forward modeling and inverse (mainly include surface data, VSP data and snapshot record), and display them in different direction, then we can compare them very efficiently. Based on the above work, the paper tests the different finite-difference ecpression and 3-D display tool by using a model example, the testing results demonstrate the work's validity. At last, the paper lists the lacks of the work and advice the next work.