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Pore compressibility at initial field formation pressure
p_i.
It can be assessed from laboratory stress tests on cores.
There is also a number of popular correlations on initial formation porosity
\phi_i summarised in the table below:
Corrrelation | Name/Author | Scope |
---|
(1) |
c_r = 2.71 \cdot \phi_i^{-0.415} \cdot 10^{-7} \ \textrm{kpa}^{-1} |
| Hall | Consolidated sandstone under typical formation pressure |
(2) |
c_r = 1.45 \cdot \exp \big[ 4.026 - 23.07 \ \phi_i + 44.28 \ \phi_i^2 \big] \cdot 10^{-7} \ \textrm{kpa}^{-1} |
| Newman | Consolidated limestone,
0.02 < \phi < 0.33 |
(3) |
c_r = 1.45 \cdot \exp \big[ 5.118 - 32.26 \ \phi_i + 63.98 \ \phi_i^2 \big] \cdot 10^{-7} \ \textrm{kpa}^{-1} |
| Newman | Consolidated sandstone,
0.02 < \phi < 0.33 |
(4) |
c_r = 1.45 \cdot \exp \big[ 34.012 \cdot ( \phi - 0.2) \big] \cdot 10^{-7} \ \textrm{kpa}^{-1} |
| Newman | Unconsolidated sandstone,
0.2 < \phi < 0.5 |