Direct Layer-Stripping Approach to the Inversion of Marine Seismic Data

摘要

The conventional approach to the inversion of seismic reflection data for thelayer parameters is to minimize the error between the seismic data and synthetic seismograms calculated from an assumed model. If the error is small enough, the model is regarded as an adequate representation of the earth. If the error is too large, the model is updated in such a way as to reduce the error, and a new response is calculated. The process is repeated until the mismatch is minimized. There are two problems with this approach: first, and most important, the error function has many local minima. Convergence to the true global minimum depends on the choice of the initial model. Therefore, it is uncertain that the inversion will lead to the global minimum. Secondly, the inverse problem is not subdivided into a succession of simpler problems. Therefore, all parameters of the model have to be solved at once. In the thesis, an inversion scheme that works on the data directly is proposed.