An oil reservoir has an average porosity 12%. the reservoir temperature is 98 ºc. the water resistivity rw measured at room temperature 24 ºc on the water sample from the reservoir is 0.07 ohm. m:
a) what is the water resistivity rw at reservoir temperature?
b) let the cementation exponent m be 1.7, saturation exponent n be 2, tortuosity a be 1, the reservoir water resistivity be obtained above, and the resistivity of the mud filtrate at 98 ºc is 0.08 ohm. m. if the true formation resistivity rt measured from well logging is 85 ohm. m and resistivity of the flushed zone rxo is 16 ohm. m, calculate the oil saturation and the recovery factor of the reservoir.