A cylindrical clean sandstone core plug 2.0 cm in diameter and 6.0 cm in length is...
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A cylindrical clean sandstone core plug 2.0 cm in diameter and 6.0 cm in length is 100% saturated with a saline water of resistivity R,=0.10 2 m. For a potential drop of 5.7 V (from end to end), the saturated core will pass a current of 15 mA. a. What is the resistivity of this rock? b. What is the formation resistivity factor for this core? c. Using the above data, estimate the porosity of the core plug, d. A direct laboratory measurement indicated that the porosity of the above core plug is 23%. Compare this value to that cal- culated in Part c and explain why they differ. Which of the two values is more representative of the core plug porosity? Exnlain A cylindrical clean sandstone core plug 2.0 cm in diameter and 6.0 cm in length is 100% saturated with a saline water of resistivity R,=0.10 2 m. For a potential drop of 5.7 V (from end to end), the saturated core will pass a current of 15 mA. a. What is the resistivity of this rock? b. What is the formation resistivity factor for this core? c. Using the above data, estimate the porosity of the core plug, d. A direct laboratory measurement indicated that the porosity of the above core plug is 23%. Compare this value to that cal- culated in Part c and explain why they differ. Which of the two values is more representative of the core plug porosity? Exnlain
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