This paper addresses the characterization of the global net-to-gross NTG (sand to non-sand ratio) of a reservoir, and the assessment of the corresponding uncertainty.

This paper addresses the characterization of the global net-to-gross NTG (sand to non-sand ratio) of a reservoir, and the assessment of the corresponding uncertainty. The available data are a few wells, possibly biased towards the high pay zones, and a cube of seismic impedance.