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Fluid injection test, long time

The conditions required to measure the three-dimensional storage coefficient R in the long-time limit are that $\delta p_f^{(1)} = \delta p_f^{(2)}= \delta p_f$, while $\delta p_c = 0$.It follows therefore from (defs) and (storage) that  
R \equiv \left. {{\partial \zeta}\over{\partial p_f}}\right ...
 ...}} +
\phi\left({{1}\over{K_f}} - {{1}\over{K_{\phi}}}\right).
 \end{displaymath} (22)

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