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Originally posted by Jogoo:
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Gimo, I like your enthusiasm, but I think your inputs need some downwards massaging. I’ll leave your area alone because I’m not sure what it’s based on, Some reservoir parameters are from Beharra Springs North-1 where average net pay porosity is 13%, (superior to that in SE-1) the Sw was 59% (ie Sg 41%). The inferior quality of the reservoir at SE-1 suggests that Sg will be less than 40%. Recovery factor is difficult to estimate ahead of time because of a variety of reasons, but even in the most optimistic of scenarios 60% would be remarkable for this reservoir IMHO. The “gasifier” average porosity is 4.3% at Beharra Springs North-1.Your expansion factor also stands out as improbable. Nearby wells have a geothermal gradient of 3.16 C/100m so the temperature at SE-1 Wagina is around 150C, pressure 7500 psi (Estimate stated in Ann), gasses from other nearby discoveries have specific gravity of 0.62 relative to air —> 1/Bg is approx 280 scf/rscf.If - and I reiterate “if”I adopt your assumption on productive area I get approx 200 Bscf recoverable. Which is still nice but has a lot of ifs.Gimo, I like your enthusiasm, but I think your inputs need some downwards massaging. I’ll leave your area alone because I’m not sure what it’s based on, Some reservoir parameters are from Beharra Springs North-1 where average net pay porosity is 13%, (superior to that in SE-1) the Sw was 59% (ie Sg 41%). The inferior quality of the reservoir at SE-1 suggests that Sg will be less than 40%. Recovery factor is difficult to estimate ahead of time because of a variety of reasons, but even in the most optimistic of scenarios 60% would be remarkable for this reservoir IMHO. The “gasifier” average porosity is 4.3% at Beharra Springs North-1.Your expansion factor also stands out as improbable. Nearby wells have a geothermal gradient of 3.16 C/100m so the temperature at SE-1 Wagina is around 150C, pressure 7500 psi (Estimate stated in Ann), gasses from other nearby discoveries have specific gravity of 0.62 relative to air —> 1/Bg is approx 280 scf/rscf.If - and I reiterate “if”I adopt your assumption on productive area I get approx 200 Bscf recoverable - Which is still nice but has a lot of ifs.
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Many thx, Jogoo - very interesting!!!..Your expansion factor also stands out as improbable... ". 7,500 psi and 150C (which is 760R ). @OldGeo for the Lockyer Deep gas... 393 scf/ft³ which is about 40% larger than your calculation but using the same figures for P(hi) and T...
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