Model-based inversion in practice

• In practice, model-based inversion involves:

• First, build a model using interpolated sonic log velocities and picked horizons.

• Second, extract a good estimate of the seismic wavelet.

• Third, “block” the input model to a reasonable block size.

• Finally, invert the data. Instead of matrix inversion, we step through a series of iterations using the conjugate-gradient method.