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| Titel |
Combination of 3-D Geological Modelling and Geothermal Simulation: a flexible workflow with GeoModeller and SHEMAT |
| VerfasserIn |
J. F. Wellmann, K. Regenauer-Lieb, K. Gessner, H. Deckert |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026612
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| Zusammenfassung |
| Accurate 3-D geological models as well as coupled numerical simulations of heat and fluid
flow are becoming increasingly popular tools in exploration for geothermal resources and
their evaluation. Many studies have been performed to simulate geothermal fields
numerically. Still, these simulations are usually based on a static geological model. If more
geological data become available, it is usually tedious to reconstruct the 3-D mesh for the
geothermal simulation. Also, a lot of manual work is then normally required. We
present a flexible and fast workflow that provides a short cut from raw geological
data to a full 3-D process model of heat transfer and fluid flow in a geothermal
field.
We combine two powerful tools: GeoModeller to construct the geological model, and
SHEMAT for the coupled simulation of heat transfer and fluid flow. GeoModeller is a full
3-D structural geological modelling tool developed by BRGM and Intrepid. It uses an
implicit potential-field approach that allows the construction of geological models directly
based on input data and stratigraphic considerations (Calcagno, 2008). SHEMAT (Simulator
for HEat and MAss Transport) is a finite difference reactive transport code that was
developed for thermal and hydrogeological problems (Clauser, 2003). It has already been
intensely used for geothermal applications.
To combine both programs, we developed the following workflow: firstly, the 3-D
geological model is constructed with GeoModeller. The model is discretized into a voxet
format and exported. This data is then reformatted and combined with other relevant data into
a model input file for SHEMAT. To automate this step, we developed a set of python scripts.
The geothermal simulation with SHEMAT can then directly be performed on this input
file.
The major benefit is that this combination allows the use of a realistic full 3-D geological
model as basis for the geothermal simulation in a simple and straightforward way. It is
easily possible to change the geological model if new data become available and to
incorporate the revised model into the simulation. Furthermore, this combination is ideal
for hypothesis testing of flow geometry variation caused by different geological
architectures. |
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