This is a great piece that helps our understanding of Khurais a lot.

One question - I have a memory of reading (can't remember where) that the Arab-D in Khurais isn't as fully charged as in Ghawar. Have you looked at that at all? Is there any data on the papers you read on the initial position of the OWC?

One thing that might have useful information is the USGS publication on the greater Ghawar petroleum system, which has a lot of details on the source rock and the process of charging the reservoirs.

I remember reading that too. I think it was in relation to one explanation for the uneven OWC in Ghawar, with moving water sweeping upwardly moving oil more towards the east, and hence Ghawar got more of it. The question is, how much more could Khurais have held? In SPE 77743-MS, Arab-D contours suggest better closure to the north and east than the south and west. Perhaps it would have all leaked out through Abu Jifan and beyond if there was a lot more that came up from below.

I haven't seen anything discussing the OOWC for Khurais, but I am doubtful it has been produced enough for there to be much difference. There was probably more uncertainty in where it was since they had so few wells near it (similar to early Haradh), and this seems to be reflected in other versions of the field boundary.