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Line 45: + + + + − [[File:Formula1.jpg|250px|thumbnail|center]]+ − − # Effective permeability (Kef) − [[File:Formula2.jpg|250px|thumbnail|center]]+ − With effective permeability is : <math>\text{K}_\text{ef} = {\text{K}_\text{r} \times \text{K}_\text{a}}</math>+ + +
→Permeability
Absolute permeability retrieved from conventional core analysis or by the approach through equations based on log analysis. Empirical equation that can be used is :
Absolute permeability retrieved from conventional core analysis or by the approach through equations based on log analysis. Empirical equation that can be used is :
* Timur equation:
:: <math>k_a = 0.136 \frac{\phi^{4.4}}{Swi^2}</math>
* Coates equation
:: <math>k_a^{1/2} = 100 \phi^2 \frac{[1 - Swi]}{Swi^2}</math>
====Effective permeability (Kef)====
Measurements can be made directly at the reservoir scale well test analysis. Direct measurement is only valid on the condition that a constant fluid saturation. In the analysis of special core analysis laboratory with a known value of relative permeability. Relative permeability equation for Corey Model is:
Measurements can be made directly at the reservoir scale well test analysis. Direct measurement is only valid on the condition that a constant fluid saturation. In the analysis of special core analysis laboratory with a known value of relative permeability. Relative permeability equation for Corey Model is:
: <math>k_{rw} = (S_w^*)^4</math>
: <math>k_{ro} = (1 - S_w^*)^3 (1 + S_w^*)</math>
With effective permeability is
: <math>\text{K}_\text{ef} = {\text{K}_\text{r} \times \text{K}_\text{a}}</math>
===<big>Fluid Saturation (S)</big><big></big>===
===<big>Fluid Saturation (S)</big><big></big>===