**3. Model Test**

In order to verify the feasibility of the method, we carried out tests on theoretical model data and real seismic data. The lateral extrapolation path of inversion parameters is obtained by tracing the lateral position of velocity spectrum according to the method in this paper. In our tests, the interval velocity is used as the inversion parameter to check the extrapolation result. The tests were carried out on a PC equipped with Intel (R) i7 12,700 CPU, an RTX3060TI GPU, 16 GB RAM, and Ubuntu 19 operating system.
