1. Often the porosity or effective porosity is used as an upper bound to the specific yield. 2. The identification of clay types is also useful for calculating the effective porosity of reservoir rock. 3. Log derivation of effective porosity includes CBW as part of the volume of shale ( V sh ). 4. ;Effective porosity \ phi _ { e1 } : The sum of all the interconnected pore space. 5. In the vast majority of cases, this core analysis and Petroleum Engineering definition of effective porosity equates to total porosity. 6. A dramatic example of a core effective porosity vs log effective porosity discrepancy comes from some Greensand reservoirs in Western Australia. 7. A dramatic example of a core effective porosity vs log effective porosity discrepancy comes from some Greensand reservoirs in Western Australia. 8. However, glauconitic microporosity is measured as part of the effective porosity in core plugs, even if they are humidity dried. 9. Log effective porosities calculated at 25 % in some Greensand reservoirs have yielded core analysis effective porosities of 35 % at equivalent depths. 10. Log effective porosities calculated at 25 % in some Greensand reservoirs have yielded core analysis effective porosities of 35 % at equivalent depths.
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