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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A080 (1986)

First Page: 55

Last Page: 58

Book Title: SG 21: Oil and Gas Assessment: Methods and Applications

Article/Chapter: Comparison of Predrilling Predictions with Postdrilling Outcomes, Using Shell's Prospect Appraisal System

Subject Group: Oil--Methodology and Concepts

Spec. Pub. Type: Studies in Geology

Pub. Year: 1986

Author(s): D. Sluijk, J. R. Parker

Abstract:

Since 1975 Shell Internationale Petroleum Maatschappij has used a Monte Carlo simulation model for worldwide prospect appraisal. The input parameters to this model describing charge (oil and gas available for trapping and retention), structure, reservoir, and retention (seal characteristics) are given in the form of probability distributions. For the estimation of charge and retention, the model follows a scheme of Bayesian update and uses equations derived from calibration studies, that is, statistical analysis of extensive data sets with a worldwide distribution. Comparison of predrilling predictions with postdrilling results suggests that the underlying calibration procedure is sound. It also demonstrates the importance of assessing geologic uncertainty in a quantitati e manner. Geologists appear to have been successful in describing the geologic setting of prospects with respect to hydrocarbon charge and retention (the calibrated parts of the system); however, serious overestimation has occurred with respect to reservoir parameters, trap existence, and related factors (the uncalibrated parts of the system).

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