Building Input File
Reservoir & Aquifer Data

• Pressure & Saturation Initialization
• options
  • by grid region
  • on grid by grid basis (exercise)
  • by layer
• if grid by grid option used - enter "dummy" values for other two options

1	1	2100	0.0					(pressure, saturation option,pressure datum,fluid gradient)
NW	Pwoc	WOC	Pgoc	GOC	Soi	Swi	Sgi	(titles of variables for Rock rgn)
1	1400.	2100.	0.0	2100.	.88	.12	0.0	(dummy var. for rock regions)
NZ	Pi	Soi	Swi	Sgi				(titles for vars. for layers)
1	0.0	0.0	0.0	0.0				(dummy vars. for layer 1)
2	0.0	0.0	0.0	0.0				(dummy vars. for layer 2)

• Oil saturation (So)
• from volumetrics study
• Water saturation (Sw)
• Sw = (1-So)
• Pressure - initial reservoir pressure map
  • average DST shut-in pressure across the pay zone in each well
  • most well pressures above 1100 psi.
    • two wells at periphery showed low pressures (<= 400 psi)
      • simulation run failure
  • pressure map normalized - layer 1 pressure >= 1100 psi
• Aquifer
  • Schaben field has an active bottom water drive
  • bottom layer acts as the aquifer
  • porosity = 25% - obtained from the well logs of Humburg #1
  • horizontal permeability = 25 md - Kx & Ky assumed equal
  • vertical permeability ranges from 0.1 to 4.5 md
    • derived from field & well history match
    • critical role in controlling water production in wells
  • pressure = 1400 psi - assumed to be higher than maximum reservoir pressure