Performance prediction using geostatistics and window reservoir simulation
- Saudi Aramco, Dhahran (Saudi Arabia)
This paper is the first window model study in the northern area of a large carbonate reservoir in Saudi Arabia. It describes window reservoir simulation with geostatistics to model uneven water encroachment in the southwest producing area of the northern portion of the reservoir. In addition, this paper describes performance predictions that investigate the sweep efficiency of the current peripheral waterflood. A 50 x 50 x 549 (240 m. x 260 m. x 0.15 m. average grid block size) geological model was constructed with geostatistics software. Conditional simulation was used to obtain spatial distributions of porosity and volume of dolomite. Core data transforms were used to obtain horizontal and vertical permeability distributions. Simple averaging techniques were used to convert the 549-layer geological model to a 50 x 50 x 10 (240 m. x 260 m. x 8 m. average grid block size) window reservoir simulation model. Flux injectors and flux producers were assigned to the outermost grid blocks. Historical boundary flux rates were obtained from a coarsely-ridded full-field model. Pressure distribution, water cuts, GORs, and recent flowmeter data were history matched. Permeability correction factors and numerous parameter adjustments were required to obtain the final history match. The permeability correction factors were based on pressure transient permeability-thickness analyses. The prediction phase of the study evaluated the effects of infill drilling, the use of artificial lifts, workovers, horizontal wells, producing rate constraints, and tight zone development to formulate depletion strategies for the development of this area. The window model will also be used to investigate day-to-day reservoir management problems in this area.
- OSTI ID:
- 113397
- Report Number(s):
- CONF-950310-; TRN: IM9544%%357
- Resource Relation:
- Conference: 9. Middle East oil show and conference: optimizing resources in a cost-conscious and challenging environment, Manama (Bahrain), 11-14 Mar 1995; Other Information: PBD: 1995; Related Information: Is Part Of Middle East oil show: Proceedings. Volume 1; PB: 642 p.
- Country of Publication:
- United States
- Language:
- English
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