Initialization with J function and in-place comparison with geomodel

[payam_149]

Hi all,

When we initialize model with j func to honor well data and static model, we will come up with a in-place which is different than static model, because in static model and SHF, Sor is not considered when sw is being calculated for each rock type, then calculated in-place from initialization is higher than what static model estimate. is it correct observation?


p.s.: j function in initialization is entered as Pc which will be equal zero at sw=1-sor.

rgds

[vinomarky]

Nope. Sor generally has nothing to do with initial hydrocarbon saturations (unless you have some correlation tied to residual oil saturations - not a normal approach and would not be my preference). Sor is generally a residual oil saturation to water flooding. That is, there was a primary drainage to charge the reservoir, then a subsequent imbibition to displace the mobile oil with water. Unless you have something like a partial seal breach which has resulted in a imbibition process which has raised the FWL, then at Pc=0, Sw=1 (not 1-Sor)

Likely main difference is that they simply use a different method to populate saturations. Period. Ask the geos how they populate saturations, and you should be able to answer the question yourself

[payam_149]

Thank you for explanation. Let me explain what I am experiencing. When I initialize with JFUNC keyword, depends on Rock Type, we have some cells with high Sw, close to 1. I am going to use ENDSCALE for SWCR scaling only, First, is it right to do scaling only for SWCR only, The reason I am using SWCR only is, some wells with high Sw do not produce water. Second, for some cells with high SWCR, initially consistency error was happened (SWOCR+SWCR<=1), when I fix that problem in simulation, some cells (depend on RT) which are above transition zone will have SW more than SWCR and will flow. Am I doing the right thing? Is there a way to fix the problem, because Eclipse will calculate Sw based on Jfunc and I have to use this option.
Thanks.