--> Abstract: Probabilistic Prediction of Reservoir Quality in Deep Water Prospects Using an Empirically Calibrated Process Model, by L. M. Bonnell, R. H. Lander, J. C. Matthews, and C. J. Lowrey; #90923 (1999)
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BONNELL, L. M., R. H. LANDER, J. C. MATTHEWS, Geologica A.S., Stavanger, Norway and C. J. LOWREY, University of Oslo, Oslo, Norway

Abstract: Probabilistic Previous HitPredictionNext Hit of Reservoir Quality in Deep Water Prospects Using an Empirically Calibrated Process Model

Presently, deep water reservoirs are generally synonymous with frontier areas. Frontier areas have few wells, little core and a large uncertainty in reservoir character. A key uncertainty in prospect assessment is reservoir quality. As shown by Rose (1987), 40% of dry holes can be related to poor Previous HitpredictionNext Hit of reservoir quality.

In this study, we demonstrate a method for pre-drill reservoir quality risk assessment and sensitivity analysis using the Exemplar Previous HitsandstoneNext Hit diagenetic model combined with Monte Carlo techniques. The Exemplar model is a broadly applicable, empirically calibrated process model that simulates two key reservoir quality reducing processes: compaction and quartz cementation. The model traces the evolution of porosity and Previous HitpermeabilityNext Hit through time and uses Previous HitsandstoneNext Hit composition and Previous HittextureNext Hit, and burial history data as input.

Because there is a lack of well control in frontier areas, reservoir composition and Previous HittextureNext Hit must be derived using sedimentological models and depositional analogues. The combination of the diagenetic model and Monte Carlo techniques allows us to incorporate uncertainties in the sedimentological interpretation and burial history models in probabilistic reservoir quality Previous HitpredictionNext Hit. In addition, we can use sensitivity analysis to evaluate which uncertainties have the greatest impact on porosity and Previous HitpermeabilityNext Hit Previous HitpredictionNext Hit. To illustrate this approach for pre-drill reservoir quality Previous HitpredictionNext Hit, we use examples Previous HitfromTop the Norwegian shelf where we have done extensive work on both simulating reservoir quality and tying the diagenetic model to facies and provenance models. Using these mature areas as an example allows us to test the approach by comparing our predictions to measurements.

AAPG Search and Discovery Article #90923@1999 International Conference and Exhibition, Birmingham, England