oa Porosity Prediction in Carbonates – Learnings from the North Sea Chalk Applied to Platform Carbonates

Porosity can be predicted from seismic data when seismic impedance is correlated with porosity. One of the problems is that the correlation between impedance and porosity can be to a large degree determined by the low-frequency component of impedance, which is not present in seismic data. We explain how to overcome this problem and show the method which we developed while working on North Sea chalk. In addition to broad-band impedance data, the impedance - porosity transforms should be derived separately for different facies, in order to apply the same workflow to platform carbonates.