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3. Using Figure 7.21 of your textbook, answer the following questions: (8 points) a. What are the zones A, B, C, and D indicating? b. The resistivity of the mud

filtrated is higher, lower or equal to the resistivity of the formation? c. Would you use focusing electrode tools in this well? (yes or no) d. Why?

Fig: 1

Fig: 2

Fig: 3

Fig: 4

Fig: 5