Outline and joint characterization of Transboundary geothermal reservoirs at the western part of the Pannonian basin

Rotár‐Szalkai, Ágnes; Nádor, Annamária; Szőcs, Teodóra; Maros, Gyula; Götzl, Gregor; Zekiri, F.

doi:10.1016/j.geothermics.2017.05.005

Cited by 15 publications

(12 citation statements)

References 22 publications

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“…The utilization of thermal water has a long tradition in the Pannonian Basin and Hungary (Szanyi et al 2009;Szanyi and Kovács 2010;Rman et al 2015;Rotár-Szalkai et al 2017;Szőcs et al 2018). Thermal water is widely used for balneological and heating purposes, especially in the agriculture sector, representing the major part of direct use (Nádor et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the regional groundwater flow systems in south Transdanubia (Hungary) to understand karst evolution and development of hydrocarbon and geothermal resources

Csondor

Czauner

Csobaji³

et al. 2020

Hydrogeol J

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In South Transdanubia (Hungary), the remarkable geothermal and hydrocarbon resources in the Drava Basin and the hypogene caves at the margin of outcropping carbonate hills were usually investigated separately and their interactions were hitherto neglected. The aim of this study is to give all these groundwater-related resources and phenomena a common framework applying the concept of regional hydraulic continuity, and to complete the regional (i.e., basin-scale) hydraulic assessment of the area based on preproduction archival measured data. Pressure-elevation profiles, tomographic fluid-potential maps and hydraulic cross-sections were constructed to determine the vertical and horizontal fluid-flow conditions. As a result, two kinds of fluid flow systems could be identified. Within the gravitational flow systems, horizontal flow conditions are dominant and the regional flow direction tends toward the S-SE. In deeper basin regions, an overpressured flow system is prevalent, where fluids are driven laterally from the deeper sub-basins towards their margins. Based on the regional-scale evaluation of fluid flow systems, conclusions could be drawn regarding the geothermal and hydrocarbon potential of the area. Additionally, local-scale phenomena could be explained, particularly in the southern foreland of the Villány Hills. Cave formation cannot be related to the present-day flow systems here. In the Harkány area, groundwater chemistry could be explained by fluid contribution from the Drava Basin. A comparison with the marginal Buda Thermal Karst area allows for generalized conclusions regarding the connections between marginal karst reservoirs and the Pannonian Basin.

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Section: Introductionmentioning

confidence: 99%

Characterization of the regional groundwater flow systems in south Transdanubia (Hungary) to understand karst evolution and development of hydrocarbon and geothermal resources

Csondor

Czauner

Csobaji³

et al. 2020

Hydrogeol J

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“…The Pannonian basin in Central Europe is a typical case, where clarifications of the same reservoirs vary in the neighbouring countries due to the use of different geological nomenclatures for the same formation, different understandings of the thermal water flow systems, dissimilar models of the subsurface temperature field, etc. Although some promising progress in terms of common models has been achieved in the western part of the Pannonian basin (e.g; Rman et al 2016;Rotár-Szalkai et al, 2017;Nádor et al, 2019), the southern part remained a great challenge due to the highly uneven data distribution, and lack of FAIR principles (Findable, Accessible, Interoperable and Reusable) for data policies (Nádor, 2019). Nevertheless through the joint efforts of geoscientists from the…”

Section: Discussionmentioning

confidence: 99%

“…The method for delineating 'potential reservoirs' within the several thousand metre thick Pannonian (especially Upper Pannonian) sedimentary succession has been elaborated previously (Rotár-Szalkai et al, 2017). It is based on the combination of representative geological horizons (top and bottom bounding surfaces of a given hydrogeological unit, potentially storing thermal water) by various subsurface isotherm maps by applying SURFER and ArcGIS softwares.…”

Section: Methods Of Reservoir Delineationmentioning

confidence: 99%

“…Therefore in the present paper we focus on the geothermal potential assessment methods targeting these porous reservoirs of the Pannonian basin. We present delineation methods for the so-called 'basin-fill' (BF) reservoirs storing thermal water of different temperatures which have already been applied to different parts of the Pannonian basin (Rotár-Szalkai et al, 2017), and also discuss novel methods for quantifying the extractable amount of heat associated with the heat content of fluids stored in the effective pore space (i.e. 'moveable water').…”

Section: Introductionmentioning

confidence: 99%

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New methods of geothermal potential assessment in the Pannonian basin

Nádor

Sebess-Zilahi

Rotár‐Szalkai

et al. 2019

Netherlands Journal of Geosciences

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The Pannonian basin in Central Europe is well known for its rich geothermal resources. Although geothermal energy has been utilised, mainly for direct use purposes, for a long time, there are still a lot of untapped resources. This paper presents novel methods for outlining and assessing the theoretical and technical potential of partly still unknown geothermal reservoirs, based on a case study from the Dráva basin, one of the sub-basins of the Pannonian basin along the Hungarian–Croatian border. The presented methods include reservoir delineation based on combining geological bounding surfaces of the Upper Pannonian basin-fill units with a set of isotherms deriving from a conductive geothermal model. The geothermal potential of each identified reservoir was calculated by a Monte Carlo method, which was considered as being represented by the heat content of the fluids stored in the effective pore space (‘moveable fluid’). The results underline the great untapped geothermal potential of the Dráva basin, especially that of the reservoir storing thermal water of 50–75°C, which has the largest volume and the greatest stored heat content.

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“…The Tertiary Lake Pannon was gradually filled up by alluvial sediments being transported from the surrounding uplifting Alps and Carpathians. The severalthousand-meters-thick deposits of the Upper Miocene to Pliocene siliciclastic sediments have low thermal conductivity but quite high permeability, thus representing the main transboundary geothermal aquifers (Nádor et al 2012;Szőcs et al 2013;Rman et al 2015a;Rotár-Szalkai et al 2017), referred to as the basin fill sediments in this paper. Below-positioned Pannonian delta slope sandstones are also accounted for within this unit.…”

Section: Settingsmentioning

confidence: 99%

Geothermal sources and utilization practice in six countries along the southern part of the Pannonian basin

Rman

Bălan

Bobovečki³

et al. 2019

Environ Earth Sci

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Data on thermal water sources with outflow temperature of 30 °C and above were analyzed from the N-ern parts of Bosnia and Herzegovina, Serbia and Croatia, S-ern parts of Hungary, W-ern parts of Romania, and NE-ern parts of Slovenia, altogether from an area of 99,347 km 2. The overview identified 771 geothermal sources; only 7 were thermal springs. The average well depth is about 1.2 km. About 13% of wells are younger than 10 years, additional 17% below 30 years; while 26% are older than 50 years. Average thermal water outflow temperature is 54 °C being the highest, 170 °C, in Croatia. Most thermal water is produced from basin fill sediments-Lower and Upper Pannonian (Mio-Pliocene) loose sandstones which are tapped by 86% of wells. The rest appertains to basement rocks-fissured, fractured and karstified Paleozoic, Mesozoic and Middle Miocene metamorphic, carbonate and siliciclastic rocks. In total, 72% sources hold water rights, 6% mining rights, 2% geothermal rights and 1% has no rights. The permits allow much higher water abstraction as currently listed. Usage for bathing and balneology encompasses 24% of all active sources (155), some of these also with heating (23). 104 objects (16%) are used for heating, also district heating (13) and individual space heating (3). An additional 10% (70) are used in agriculture, mainly greenhouse heating. There are 41 reinjection wells (5%). It is primarily in Hungary that drinking water (17%), industrial usage (5%) and monitoring wells (2%) are also common.

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Outline and joint characterization of Transboundary geothermal reservoirs at the western part of the Pannonian basin

Cited by 15 publications

References 22 publications

Characterization of the regional groundwater flow systems in south Transdanubia (Hungary) to understand karst evolution and development of hydrocarbon and geothermal resources

Characterization of the regional groundwater flow systems in south Transdanubia (Hungary) to understand karst evolution and development of hydrocarbon and geothermal resources

New methods of geothermal potential assessment in the Pannonian basin

Geothermal sources and utilization practice in six countries along the southern part of the Pannonian basin

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