Bulk Volume Water and Porosity Mapping in Shaly Sandstones
Adjusting log data by a series of formulas, as we have done in the preceding chapter, resolves only one of foe issues concerning shaly sands. Another problem is establishing a way to predict, on a broader scale than just foe well bore, where shale is degrading a reservoir the most. Changes in reservoir quality are best reflected by iden-tifying special parameters that can be used fo create maps. Two of the most significant mapping parameters are porosity and bulk volume water; both of these can be related to log-derived permeability.