Page 63 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Basic Principles, Definitions, and Data 51

porosity were related by a simple empirical formula. However, in a more
extensive study, Newman E711 suggests that any correlation between pore volume
compressibility and porosity does not apply to a wide range of reservoir rocks.
As shown in Figure 5-35a, Newman's study in limestones showed poor agreement
with the correlations of Hall and Van der Knapp. Figures 5-35b to 5-35d show

t

1 .o r......l
1.0 1 - 1

0 5 1 0 1 5 2 0 2 5 9 0 3 5
lnlal PomtIy at Zero Nei Preasure

Figure 5-35. Pore-volume compressibility at 75% lithostatic pressure vs.
sample porosity [71].