The second type of inversion, which is more recent than the band-limited method, involves producing a “blocky” output rather than a band-limited output. There are several methods that produce this type of output, and they are sometimes referred to as ''sparse-spike'' or ''model-based methods''. These methods work by producing a forward model that best reproduces the seismic data when converted to synthetic form (that is, when the reflection coefficients are convolved with the wavelet). This method involves starting with a simple “guess” of this model and changing this guess iteratively until the error between the model and the observed seismic data is minimized (see [[Forward modeling of seismic data]]). The results of doing such a model-based inversion are shown in [[:file:seismic-inversion_fig3.png|Figure 3]] for the same traces shown in [[:file:seismic-inversion_fig2.png|Figure 2]]. Notice that the carbonate reef is visible, and looks like the blocked version of the log. | The second type of inversion, which is more recent than the band-limited method, involves producing a “blocky” output rather than a band-limited output. There are several methods that produce this type of output, and they are sometimes referred to as ''sparse-spike'' or ''model-based methods''. These methods work by producing a forward model that best reproduces the seismic data when converted to synthetic form (that is, when the reflection coefficients are convolved with the wavelet). This method involves starting with a simple “guess” of this model and changing this guess iteratively until the error between the model and the observed seismic data is minimized (see [[Forward modeling of seismic data]]). The results of doing such a model-based inversion are shown in [[:file:seismic-inversion_fig3.png|Figure 3]] for the same traces shown in [[:file:seismic-inversion_fig2.png|Figure 2]]. Notice that the carbonate reef is visible, and looks like the blocked version of the log. |