Seismic Reflection Tomography by Cell Parameterization

셀 매개변수에 의한 탄성파 반사주시 토모그래피

  • 서영탁 (서울대학교 지구환경시스템공학부) ;
  • 신창수 (서울대학교 지구환경시스템공학부) ;
  • 고승원 (서울대학교 지구환경시스템공학부)
  • Published : 2003.05.01

Abstract

In this study, we developed reflection tomography inversion algorithm using Straight Ray Technique (SRT) which can calculate travel time easily and fast for complex geological structure. The inversion process begins by setting the initial velocity model as a constant velocity model that hat only impedance boundaries. The inversion process searches a layer-interface structure model that is able to explain the given data satisfactorily by inverting to minimize data misfit. For getting optimal solution, we used Gauss-Newton method that needed constructing the approximate Hessian matrix. We also applied the Marquart-Levenberg regularization method to this inversion process to prevent solution diverging. The ability of the method to resolve typical target structures was tested in a synthetic salt dome inversion. Using the inverted velocity model, we obtained the migration image close to that of the true velocity model.