Packing proximity index

Fig. 16. Plot of packing proximity index (Kahn, 1956) versus amount of carbonate cement (vol%) in the proximal (calcite) and distal (dolomite) domains.

In order to better evaluate the effects of compaction on porosity loss, the packing proximity index (Kahn, 1956) was measured in 44 samples derived from both oil and water zones in the Albacora Field. Plotting these data against calcite cement volumes (Fig. 17) indicates that for the same calcite cement content, the packing proximity index is lower in oil zone samples than in samples derived from the water zone. This means that compaction was less intensive in the oil zone than in the water zone. Furthermore, there is a relatively good correlation... 

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