Geothermal reservoir; Probabilistic models; Structural uncertainty; Uncertainty quantification; Discretizations; Dispersion coefficient; Model-based OPC; Probabilistics; Test designs; Tracer tests; Uncertainty quantifications; Renewable Energy, Sustainability and the Environment; Geotechnical Engineering and Engineering Geology; Geology
Abstract :
[en] Evaluation of underground processes requires numerical modeling based on sophisticated and reliable meshing. Our new GeoMeshPy library focuses on the discretization of probabilistic geological structures. This study presents a synthetic show-case for the capacity of this library to quantify the impact of structural uncertainty. In here, 50 models were developed taking advantage of the computational efficiency of GeoMeshPy. Assuming a geothermal doublet system embedded in a faulted reservoir with unclear structure, recovery time and magnitude of a tracer breakthrough was calculated. Even small angular variations up to ±15° in one of the faults yield differences of up to 26 and 30 percent for peak arrival time and magnitude, respectively. An additional inversion scheme of each of the 50 curves allows quantifying the impact on Péclet number varying from 3.4 to 4.3 due to structural variability. Analytically calculated dispersion coefficients are almost one order of magnitude higher than values used for simulations. Besides this mismatch, calculated dispersion coefficients are unable to represent the structural uncertainty (ranging from 125.6 to 129.4 m).
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Dashti, Ali; Institute of Applied Geosciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Gholami Korzani, Maziar; Institute of Applied Geosciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany ; School of Civil and Environmental Engineering, Queensland University of Technology, Brisbane, Australia
Geuzaine, Christophe ; Université de Liège - ULiège > Département d'électricité, électronique et informatique (Institut Montefiore) > Applied and Computational Electromagnetics (ACE)
Egert, Robert; Institute of Applied Geosciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Kohl, Thomas ; Institute of Applied Geosciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Language :
English
Title :
Impact of structural uncertainty on tracer test design in faulted geothermal reservoirs
Ali Dashti is receiving the financial support from The German Academic Exchange Service (Deutscher Akademischer Austauschdienst: DAAD) to do his PhD in Germany as the Research Grants- Doctoral programmes in Germany 2019/20. This organization is appreciated for giving the opportunity to researchers. The study is also part of the Helmholtz portfolio project Geoenergy. The support from the program “Renewable Energies", under the topic “Geothermal Energy Systems”, is gratefully acknowledged. Dr. Jacques Bodin is appreciated due to his help on using MFIT and informative comments.
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