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Abstract
Chapter from: CA
3: Stochastic Modeling and Geostatistics
Edited by
Jeffrey M. Yarus and Richard L. ChambersAuthors:
Sean A. McKenna and Eileen P. Poeter Methodology and Concepts
Published 1994 as
part of Computer Applications 3
Copyright © 1994 The American Association of Petroleum
Geologists. All Rights Reserved.
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Chapter 18
*
Simulating
Geological Uncertainty
with Imprecise Data for
Groundwater Flow
and Advective Transport
Modeling
Sean A. McKenna
Eileen P. Poeter
Dept. of Geology and
Geological Engineering
Colorado School of Mines
Golden, Colorado, U.S.A.
*
ABSTRACT
A known cross section composed
of a heterogeneous mixture of three hydrofacies is sampled along vertical
lines representing ten wells. These wells provide conditioning data for
stochastic geostatistical simulations. Steady-state flow and advective
transport are modeled across each resulting realization to evaluate effective
hydraulic conductivity, first arrival time, and duration of particle arrivals.
Further ensembles of realizations are produced with both the original ten
wells of conditioning data and additional soft data in the form of imprecise
estimates of the hydrofacies at every location within the simulated domain.
Use of soft data decreases the ensemble variances with respect to the first
arrival times, bulk hydraulic conductivity of the domain, and duration
of the particle arrivals relative to the ensemble variance resulting from
only ten wells of hard conditioning data. The accuracy of the resulting
distributions is influenced by biases in the conditioning data. |
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