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.
Figures & Tables
The intent of this publication is to provide the reader with a simplified review of shaly sand well log analysis. Because of the important effects that shale or clay have on both reservoir quality and well log response, a working knowledge of the subject provides a necessary basis for accurate log analysis. Techniques illustrated in the text will assist in making better decisions about the productive potential of shaly reservoirs and in mapping shaly sandstones. This book is intended as a quick look, ready reference guide.