[ OK - this is slightly emberrassing; but I have reached the limit of my understanding of the black-oil model. ]
When calculating the summary quantities ROIP (Region oil in place) and RGIP (Region gas in place) we should sum up over the correct phase, and the amount of oil/gas in the "other phase": I.e. RGIP ~ sum( SGAS + RS(?)) and ROIP = sum( (1 - sgas + swat) + RV) But RS and RV are not in the "saturation space". So what gives? Jaoakim
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