A well is drilled through a hydrocarbon-bearing formation which is at its irreducible water saturation and it has a porosity of 28%. Rock core data indicates that (a=0.81, m=2, and n=2). The mud used for drilling is water-base, with a salt concentration (NaCl) of 50,000 ppm. The connate water has a salt concentration (NaCl) of 20,000 ppm. The shallow and deep resistivity logs readings are 12 ohm-m and 50 Ohm-m respectively. You should assume that the deep resistivity tool will be sensing the virgin zone, which does not experience any mud-filtrate invasion, and that the shallow resistivity tool will be sensing the flushed zone. The formation temperature is 145° F. What is the hydrocarbon saturation of the formation and what is the water saturation in the flushed zone?
A well is drilled through a hydrocarbon-bearing formation which is at its irreducible
water saturation and it has a porosity of 28%. Rock core data indicates that (a=0.81, m=2,
and n=2). The mud used for drilling is water-base, with a salt concentration (NaCl) of
50,000 ppm. The connate water has a salt concentration (NaCl) of 20,000 ppm. The shallow
and deep resistivity logs readings are 12 ohm-m and 50 Ohm-m respectively. You should
assume that the deep resistivity tool will be sensing the virgin zone, which does not
experience any mud-filtrate invasion, and that the shallow resistivity tool will be sensing the
flushed zone. The formation temperature is 145° F. What is the hydrocarbon saturation of
the formation and what is the water saturation in the flushed zone?
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