[Opm] Calculating ROIP and RGIP

[Andreas Lauser]

Hi,

On Mittwoch, 14. September 2016 19:06:42 CEST Joakim Hove wrote:
> [ 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?

I think these quantities are only meaning- and useful in terms of component 
mass. (alternatively, you can say "surface volume of pure phases" if you 
prefer.) So my guess for ROIP is that you need the following sum over all 
cells i in region R:

ROIP = \sum_{i \in R} PV_i * (B_o,i / rho_o,ref * S_o,i + B_g,i*R_v,i *S_g,i) 

(with PV being the pore volume of the cell, B_alpha the formation volume 
factor of phase alpha, S_alpha its saturation and rho_o,ref as the density of 
oil at surface conditions.) 

cheers
  Andreas

-- 
Measuring programming progress by lines of code is like measuring aircraft
building progress by weight.
	-- Bill Gates
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