The Improvement of 3D Traveltime Tomographic Inversion Method

SONG Jianguo, PENG Guomin, XU Weixiu, YANG Jing


As 3D high-precision seismic exploration is more and more widely used in seismic data acquisition, traveltime tomographic inversion based on first arrivals is developed from 2D to 3D. However, magnanimity data of 3D traveltime inversion brings about the problem of data storage; the absence of first arrivals with near offset reduces the precision of shallow layer; the utilization of prior information, such as small refraction and micro-logging data, can improve the precision of 3D traveltime inversion. Therefore, we make some improvements in 3D traveltime inversion method. We take compression storage for large and sparse matrix, propose virtual receivers technology, and add prior information to tomographic inversion linear equations. The application in 3D real data indicates that the improvements can effectively improve 3D traveltime tomographic inversion.

Key words: 3D seismic exploration; 3D traveltime inversion method; 3D traveltime tomographic inversion


3D seismic exploration; 3D traveltime inversion method; 3D traveltime tomographic inversion

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