1. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Vitai Zsuzsanna Mária
M.Sc. Thesis in Geology
Supervisors: Mádlné Dr. Szőnyi Judit, Ádám László PhD

2. Scope Increasing utilisation of geothermal resources in Hungary
Creating models is necessary and helpful
ISZA, 26 March 2011
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3. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Area studied N
ISZA, 26 March 2011
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4. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Area studied N
ISZA, 26 March 2011
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5. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Objectives
Collecting of geophysical and geological data of the area
Geostatistical analysis
Building the model
Study of the effect of different production and injection scenarios
ISZA, 26 March 2011
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6. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Source of data
Former hydrogeological study
Hydrocarbon exploration in the area
Geophysical measurements
Gravity anomalies, seismic data
Data from bore holes
Thickness, permeability, porosity, inflow rate, temperature, hydraulic head
ISZA, 26 March 2011
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7. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Data processing
Geostatistics
Surfer software: interpolation between bore hole data
Modelling
AQUA3D software: simulation of production, injection and cooling caused be injection
ISZA, 26 March 2011
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8. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Geology of the area
Boundary of the Tisza and Száva units
Precenozoic formations poorly known
Paleogene strata not provable
Thickness of Neogene over 2000 m
Mid-Hungarian
Line
Száva unit
Tisza unit
Basement map of the studied area marked by black frame
ISZA, 26 March 2011
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9. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Geology of the area
Boundary of the Tisza and Száva units
Precenozoic formations are poorly known
Paleogene strata not provable
Thickness of Neogene over 2000 m
Depth of the Miocene strata and the Inke-Jákó ridge
Mintaszöveg szerkesztése
Második szint
Harmadik szint
Negyedik szint
Ötödik szint
ISZA, 26 March 2011
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10. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Badenian reservoir
Abrasion conglomerate, coarse sandstone, Lithothamnic limestone, marl and sandstone (Pécsszabolcs and Rákos Formation)
Thickness
5–126,5 m
Porosity
12–17 %
Permeability
0,1–10 mD
Hydraulic conductivity
5·10-9–3·10-5 m/s
Specific storage
~8·10-6 m-1
Temperature
uncertain
ISZA, 26 March 2011
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11. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Model boundaries
Non-flow boundaries: tectonic and sedimentologic
Model boundary marked with red and the bore holes used for interpolation
Szilágy Clayey Marl
Thrust zone
Szilágy Clayey Marl
Mid-Hungarian Line
ISZA, 26 March 2011
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12. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Results
Change of pressure level due to the 20-year production of 30 L/s
Mintaszöveg szerkesztése
Második szint
Harmadik szint
Negyedik szint
Ötödik szint
(Contour lines in meters)
ISZA, 26 March 2011
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13. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Results
Change of the pressure level due to the 20-year production of 30 L/s (winter) and 5 L/s (summer)
Mintaszöveg szerkesztése
Második szint
Harmadik szint
Negyedik szint
Ötödik szint
(Contour lines in meters)
ISZA, 26 March 2011
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14. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Results
Draw-down in the production well due to continuous production
Mintaszöveg szerkesztése
Második szint
Harmadik szint
Negyedik szint
Ötödik szint
ISZA, 26 March 2011
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15. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Results
Draw-down in the production well due to alternating production
ISZA, 26 March 2011
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16. Results Retardation coefficient: Production and injection rate
Temperature break-through time [days]
30 L/s
7390
20 L/s
11040
10 L/s
22160
30 – 5 L/s
47965
20 – 4 L/s
59190
10 -3 L/s
76580
Break-through time of the 2-°C temperature decline in the production well
ISZA, 26 March 2011
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17. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Sensibility study
Anisotropy angle: significant
Anisotropy factor: significant
Hydraulics of faults: significant
Dispersivity: moderate
effect on model results
ISZA, 26 March 2011
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18. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Evaluation
Effects of the production and injection near Csurgó:
great draw-down in the production well and significant upconing in the injection well because of poor hydogeological properties (low hydraulic conductivity and specific storage) of the reservoir,
moderate changes in outer parts of the reservoir,
significant pressure oscillation due to alternating production rates,
break-through times are longer than 20 years in all of the production scenarios.
ISZA, 26 March 2011
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19. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Summary
Significant and uneven pressure decline -> Only moderate production (e.g. 10 L/s in the winter and 3 L/s in the summer) is possible.
Several estimated parameters in the model can cause serious errors -> More investigations are needed to improve the estimations.
Connection with other reservoirs cannot be excluded -> Remission of disadvantageous effects in the Badenian reservoir is also possible.
ISZA, 26 March 2011
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20. Modelling of a Badenian Geothermal Reservoir near the Inke-Jákó Ridge
Thank you
for your attention!
ISZA, 26 March 2011
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