Transcript Folie 1 - Transenergy

Recommendations for sustainable management of transboundary
hydrogeothermal resources at cross-border pilot areas
Bad Radkersburg-Hodoš Area
(Slovenia-Austria-Hungary)
Andrej Lapanje and the TRANSENERGY team
Final Event of project TRANSENERGY – Transboundary geothermal
energy resources of Slovenia, Austria, Hungary and Slovakia
Vienna, 24. June 2013
Content
1) Aims of research
2) Overview of past knowledge and utilisation status
3) Pilot area conceptual models
4) Geothermal potential assessment
- natural state and different production scenarios 5) Current vs. proposed management and utilisation
- recommendations on transboundary management -
Geographical overview
Settlements
Inhabitants
Szentgotthard
8,839
Jennersdorf
4,207
Gornja Radgona
3,115
Lenart
3,078
Radenci
2,187
Bad Radkesburg
1,326
Alltogether more than
110,000 inhabitants
Area (SI)
Area (AT)
Area (HU)
Total
Pilot area (km3)
831
666
582
2,079
Pilot area (%)
40
32
28
100
Main industry:
- Agriculture
- Machine industry
- Tourism
Aims of Research
Scope of investigation:
Geothermal system in the Preneogene basement rocks within the
Raba fault zone in the Radgona – Vas tectonic halftrench
Scientific
• What is the real extent of the Prenogene geothermal aquifer?
• Does this aquifer have an active recharge and how are the recharge
mechanisms working ? Where the recharge area is?
Management
• Do the already drilled boreholes in the Prenogene geothermal aquifer
hydraulically interfere and to what extent?
• What kind of measures is needed to reach sustainable utilisation?
• How much energy (and mass) it is possible to extract in a sustainable
way in future?
Structural overview
Previous status of knowledge
Singular projects:
- oil and gas,
- geothermal,
- underground gas storage
Synthesis:
NANUTIWA, 2005
TRANTHERMAL,
2008
Dilema (Suete, Common
project proposal, 2011):
Potential mechanism of recharge
(Domberger & Schreilechner 2007)
Recharge from infiltration in
Bakony Mts.
Wide spreading percolation from
overlaying sediments
Oveview of utilisation
Location
Water
wells
Total
yield
Outflow
temp.
Use
Bad
Radkersburg
2 wells
22 l/s
~78°C
Balneological
and energy
use
Benedikt
1 well
5 l/s
72°C
District heating
80°C
Not in use /
doublet in
preparation
Korovci
1 well
~20 l/s
No natural discharge features
No observable changes in production and quality in Benedikt
No reported changes in production and quality in Bad Radkersburg
Granted quantity (m3)
Actual production (m3)
Bad Radkersburg
700,000
No available data
Benedikt
In application
65,000
in consideration
Korovci
No consession
0
planned
Geothermal doublet
Utilization challenges
The water is technically hard to use:
- high scaling potential
Current mitigation:
- use of inhibitors
- periodical acid flushing
Solution for future (BAT):
- closed system with reinjection
(geothermal doublet)
Geological setting
• NW border of the Mura-Zala neogene sedimentary basin
• fractured Mz carbonates and Pz metamorphic rocks - Raba fault zone
• deepening towards NE to over 4000 m
Hydrogeological and geochemical setting
• The chemical composition of thermal water in Bad Radkersburg
and Benedikt is similar
• Permeability is highly anisotropic, double porosity principle and
depends on the structural position within the fault zone
• The recharge from HU is unlikely as:
– observed hydraulic heads in HU are lower than in Benedikt, Bad
Radkersburg and Korovci
–
– mineralisation of water in thermal karst (east of the pilot area) is
very high in comparison to Benedikt - Bad Radkersburg area
Natural geothermal conditions
• Temperature in the Preneogene basement rises towards NE
• Convective flow cell in Benedikt with supposed base at about 2,000 m
• Locally enhanced permeability of fissured rocks in the geothermal aquifer
Natural potential of the Preneogene aquifer
Area (SI)
Area (AT)
Area (HU)
Total area
Aqufier (km2)
349
48
73
470
Aquifer (%)
74
10
16
100
Methodology - Numerical modelling
•
•
•
•
Coupled flow and heat transfer
FEFLOW code
Two distinctive lithologies
The Raba fault zone
Geothermal potential due to different
production scenarios (reinjection or no reinjection)
Production without reinjection:
Hydraulic depression would reach
Bad Radkersburg only if
very high abstraction rates or
preference flow paths
were present.
Production with reinjection geothermal doublet Korovci :
Potential cool-down effects of the
reinjected water front, i.e.
thermal breakthrough is unlikely
after 50 years
in the pumping regime 20 l/s and
thermal regime 80 °C / 35 °C.
Current management
Current management practice
Bad Radkersburg (AT)
Benedikt (SI)
Operating pressure or water level [bar or m]
Continuously
No
Water meter (total extraction)
Continuously
Occasionaly
Outflow temperature [°C]
No info
No
Elec. Conductivity [µS/cm]
No info
No
Closing pressure or static water level
[bar or m]
No info
Annualy
Hydrochemical analysis
No info
Sporadic
Periodical flushing with acid
Inhibitor
30
45
Seepage purifying plant
- stream Mur
No treatment
- stream Drvanja
Yes
In process
Scaling prevention
Waste water temperature [°C]
Waste water treatment
Consession granted
Bilaterally agreed monitoring program and passive monitoring for this aquifer
not exist at present
ACTIONS!
• JOINT MANAGEMENT
– Monitoring
– Reporting
– Permitting / protecting
• USE OF BEST AVAILABLE TECHNOLOGY
• BENCHMARKING
• FURTHER RESEARCH
Joint management
Level of Utilization
(Exploitation)
2 – Moderate utilization
Data Acquisition
(Surveys / Monitoring)
Active monitoring
No interference
No regional scale changes
Operational monitoring
.
(qualitative and quantitative)
performed by users
Monitoring program should be
agreed between users and by
the bilateral commission
Data Management
Bilateral information base
Evaluated and calibrated
bilateral numerical model for
protecting and permitting
basic tool should be used
Aim of monitoring is to get a representative information about the used part of
the deep groundwater aquifer (M. Samek)
SI-AT ‘’Mura/Mur’’ commission opened the issue of transboundary aquifer
→ conclusions can be prepared
Follow the best-practice example of the Upper Austrian – Bavarian »Malmkarst« reservoir
Mura/Mur commission should take the initiative!
Using results of pilot area research:
The outcome of the modeling can be used establishing the
water protection area.
The Bilateral database for information exchange about
status and production data can be developed under
patrimony of Bilateral Commission.
The program of bilateral monitoring can be agreed between
Slovenian – Austrian ‘’Mura/Mur commission’’ and users
from both countries.
Monitoring should rely on existing production boreholes, no
passive monitoring is proposed.
Use of best available technology
Any new utilisation should consider the use of dublets thus:
• preventing technical difficulties,
• minimize environmental impact,
• minimize impact to the aquifer,
• minimize the interference
among users.
All existent users should follow
the use of doublets.
Benchmarking
0 Very bad25
Monitoring status
Best available technology
Thermal efficiency
Utilization efficiency
Balneological efficiency
Reinjection rate
Recharge of thermal aquifers
Overexploitation
Quality of discharged w.w.
Public awareness
125
Bad 50 Medium75 Good 100Very good
Further research
Improvement of knowledge about geological model
(collection of new data, geophysical measurement)
Implemetation of geothermal doublet (technical aspects,
influence to the coupled hydravlic-temperature field
Investigation of the potential in NE part of the aquifer at the
border region between Slovenia and Hungary for
production of electricity by binary power plants
(geophysics)
Co-workers on the Bad Radkersburg – Hodoš pilot area
GBA
dr. Rudolf Berka
Fatime Zekiri
Magdalena Bottig
mag. Gregor Goetzl
GeoZS
Tadej Fuks
dr. Mitja Janža
Dejan Šram
Simon Mozetič
mag. Dušan Rajver
Mirka Trajanova
Nina Rman
mag. Joerg Prestor
dr. Igor Rižnar
dr. Bogomir Jelen
Helena Rifelj
mag. Andrej Lapanje
MFGI
György Tóth
dr. Gyula Maros
dr. Ágnes Rotár-Szalkai
dr. Teodóra Szőcs
Thank you for your attention!