5.15 The IES of Fig. 5.77 shows a gas Formation B and an oil Formation C....

  

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5.15 The IES of Fig. 5.77 shows a gas Formation B and an oil Formation C. a. If the change in resistivity within Formation C is from a change in fluid type, determine the apparent resistivity in the water and oil zones. b. Is the borehole correction negligible? c. What is the resistivity of adjacent shales? d. What is the thickness of the oil zone? SPONTANEOUS-POTENTIAL 15 +1- A-16-M SHORT NORMAL 4000 CONDUCTIVITY o 10 INDUCTION 8000 4000 10 GAS B 37100 Temp. = 150F @7200 ft. = 0.176 ohm.m @ 150F mf dn = 8 1/2 in. 7200 DIL C Fig. 5.77-Induction log for Problem 5.15 (courtesy Amoco Oil Co.). 5.15 The IES of Fig. 5.77 shows a gas Formation B and an oil Formation C. a. If the change in resistivity within Formation C is from a change in fluid type, determine the apparent resistivity in the water and oil zones. b. Is the borehole correction negligible? c. What is the resistivity of adjacent shales? d. What is the thickness of the oil zone? SPONTANEOUS-POTENTIAL 15 +1- A-16-M SHORT NORMAL 4000 CONDUCTIVITY o 10 INDUCTION 8000 4000 10 GAS B 37100 Temp. = 150F @7200 ft. = 0.176 ohm.m @ 150F mf dn = 8 1/2 in. 7200 DIL C Fig. 5.77-Induction log for Problem 5.15 (courtesy Amoco Oil Co.).