1. Your J-function values appear strange. Were different fluids used in the cap pressure tests? I get different sets of values, so would recommend going back and recalculating all your J values (depends on what fluids your test was run with and you have in your reservoir). Note: I previously stated that J varied linearly with Pc, this is correct for given perm/poro, but that is obviously incorrect with different samples (different perm/poro)... sorry, getting late here and had a 'brain fart'
2. Once J's are recalculated, and plotted against Sw, there is still quite a lot of scatter - certainly not a single family of saturation behaviour, even if you take out the test going down to 1% Sw.
3. Lumping them altogether and I get a spread of 15% Sw midway up the curve - not really good enough. The first two samples (183211 and 183221) appear to exhibit similar poorer saturation behaviour (more dispersed clays? - different facie?) - I'd probably try to understand why (talk to your geos and petro's) - you may need one set of curves for these types of rocks, and another for the rest. Adopting this approach and you get reasonable J-function behaviour for the two families (still not great but down to ~6% spread mid way up the curve)
Were the 1% Sw and 3% Sw tests done with the same methodology and at same time as other tests? I have removed the 1% test, but really have problems believing 3% even. The problem though is that you don't have much data to go on in the first place - suggest you match incorporating the data, and then without the data and see what the impact is on your model - use as one of your uncertainty parameters
And no, I'm not going to post the spreadsheet - read the posts I suggested above and try to work through it yourself - I'm teaching people how to fish here... :-)... it took me about 15-minutes....
Reply With Quote
Bookmarks