Integrated geostatistics for modeling fluid contacts and shales in Prudhoe Bay
- Arco E and P Technology, Plano, TX (United States)
- Arco Middle East and Central Asia, Dubai (United Arab Emirates)
Geostatistics techniques are being used increasingly to model reservoir heterogeneity at a wide range of scales. A variety of techniques is now available with differing underlying assumptions, complexity, and applications. This paper introduces a novel method of geostatistics to model dynamic gas-oil contacts and shales in the Prudhoe Bay reservoir. The method integrates reservoir description and surveillance data within the same geostatistical framework. Surveillance logs and shale data are transformed to indicator variables. These variables are used to evaluate vertical and horizontal spatial correlation and cross-correlation of gas and shale at different times and to develop variogram models. Conditional simulation techniques are used to generate multiple three-dimensional (3D) descriptions of gas and shales that provide a measure of uncertainty. These techniques capture the complex 3D distribution of gas-oil contacts through time. The authors compare results of the geostatistical method with conventional techniques as well as with infill wells drilled after the study. Predicted gas-oil contacts and shale distributions are in close agreement with gas-oil contacts observed at infill wells.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 556866
- Journal Information:
- SPE Formation Evaluation, Vol. 12, Issue 4; Other Information: DN: Paper presented at the 1993 SPE annual technical conference and exhibition, October, 3--6, Houston, TX (US); PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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