Hello, I am new to processing and interpretation of seismic data. So I was wondering what is the best migration method to be applied during the processing when we are looking for subsalt reflections? I know prestack depth migration algorithms are a must when subsalt imaging is required, but which PSDM method gave you best results in practice? Also I would like to know if there is a PSTM algorithm except Kirchoff migration that can be used to get better subsalt image quality.

What input data do i need to perform acoustic impedance inversion. I have 2D seismic data and logs, but no sonic or density logs... I know that I can calculate sonic log from resistivity using Faust's equation, and from that density and AI, but is that a good practice, will it give me correct results?