3:30 PM - 3:45 PM
[STT13-19] Density parameter estimation in full waveform well-to-well tomography
Keywords:full waveform inversion, density
The objective of this study is to investigate the feasibility of the estimation of density structure when the density is inverted with the other elastic parameters and to assess if density is separable from the other parameters. We perform 2D numerical simulations in order to investigate the most important factor in the inversion of density structure as well as Vp and Vs. We conducted four numerical experiments with different inversion strategies; i.e. we invert 1) Vp and density simultaneously, 2) Vs and density simultaneously, 3) Vp, Vs and density simultaneously, and 4) only density. Considering these results, the density inversion results are affected by the other parameters and inversion results are worse than the result of inverting solely density. Compared with the other parameters, the density has a little influence on the waveform, and it is likely to be ignored in the inversion. Moreover, we conducted grid analysis of misfit function (Gholami et al., 2013) to estimate the contribution of each parameter to misfit function. These results suggest that solely inversion of density is the most effective to estimate the reliable value, on the other hand to estimate density with the other parameters is captured in the local minima.