2. An oil reservoir has an average porosity 12%. The reservoir temperature is 98
ID: 113744 • Letter: 2
Question
2. An oil reservoir has an average porosity 12%. The reservoir temperature is 98C. T the water sample from the reservoir is 0.07 ohm.m he water resistivity Rw measured at room temperature 2 4 °C on 2.1 What is the water resistivity Rw at reservoir temperature? 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 °C is 0.08 ohm.m. If the true formation resistivity Rt measured from well logging is 2.2 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. Due date: please submit your homework to your TA before your Lab section in the week of October 2nd to 5th , 2017Explanation / Answer
Answer
2.1
Water resistivity, Rw1 at room temperature,T1=24oC is 0.07Ohm.m
Water resistivity Rw2 at reservoir temperature, T2=98oC is "Rw2 =Rw1*[(T1+21.5)/(T2+21.5)]"
Rw2 =Rw1*[(T1+21.5)/(T2+21.5)]
= 0.07*[(24+21.5)/(98+21.5)]
Rw2 = 0.026Ohm.m
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