Geothermal Data of Bulgaria

Velinov, T.; Bojadgieva, Klara; Петков, Иван

doi:10.1007/978-3-642-95357-6_12

Cited by 6 publications

(5 citation statements)

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“…As a rule, high transmissivity and yield corre late to lower geothermal gradient. Previous studies (Velinov, 1986;Bojadgieva, Gasharov, 2001;Dob rev et al, 2004;Khutorskoy et al, 2019) identified low values of the geothermal gradient within the aquifer -between 1 °C/100 m and 2.5 °C/100 m, which is related to its relatively high yield. The highest values are found in the deep southwestern part of the aquifer, characterized by the least degree of karstification and where convective heat trans fer is inhibited.…”

Section: Formation Of Thermal Waters In the Study Areamentioning

confidence: 93%

Heat potential of the Upper Jurassic–Lower Cretaceous aquifer in Central Northern Bulgaria: conditions and prospective use

Gerginov¹,

Stoyanov²,

Valtchev³

et al. 2022

Rev. Bulg. Geol. Soc.

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The regional hydrogeological conditions in Northern Bulgaria determine the existence of a large artesian basin consisting of layered aquifers. The groundwater temperature increase with depth and the conditions in the deeper layers are favourable for the formation of stratified hydrothermal reservoirs with potential for heat extraction. Although it was initiated in the 1980s, the utilization of this green energy resource is still in a pre-feasibility phase. The Upper Jurassic–Lower Cretaceous aquifer has the highest yield and it is the most prospective geothermal source in the multi-layered sedimentary complex in Central Northern Bulgaria. This study provides new understanding of the formation and potential for extraction of thermal energy from this stratum, which has all characteristics of a low temperature hydrothermal reservoir. The study includes delineation of its boundaries, evaluation of hydrogeological and thermal parameters and data on hydraulic connectivity. The flow and temperature fields, the elements of the water and heat balance, as well as the groundwater quality, have been assessed. The groundwater and thermal energy resources in the hydrothermal reservoir have been estimated on a regional scale, including a scenario with reinjection. Different options for potential utilization of the thermal energy using reinjection wells have been put forward.

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Section: Formation Of Thermal Waters In the Study Areamentioning

confidence: 93%

Heat potential of the Upper Jurassic–Lower Cretaceous aquifer in Central Northern Bulgaria: conditions and prospective use

Gerginov¹,

Stoyanov²,

Valtchev³

et al. 2022

Rev. Bulg. Geol. Soc.

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“…Populations on the territory of present-day Bulgaria have used thermal and mineral waters since ancient times. The conditions and factors for their formation, distribution, qualities and potential uses have been the subject of numerous studies (Dobrev, 1912;Penev, 1927;Azmanov, 1940;Kusitaseva and Melamed, 1958;Shterev, 1964;Petrov et al, 1970;Velinov andBojadgieva, 1981, 1998;Pentcheva et al, 1997;Vladeva et al, 2000;Bojadgieva and Gasharov, 2001;Bojadgieva et al, 2010;Galabov and Stoyanov, 2011;Benderev et al, 2016, Hristov et al, 2019. Despite of the country's relatively small area of approximately 111,000 km 2 , there are 630 springs and wells located in 170 geothermal fields.…”

Section: Geological and Hydrogeological Backgroundmentioning

confidence: 99%

Mineral water bottling in Bulgaria

Hristov¹,

Valtchev²,

Trayanova³

et al. 2023

GeolBalc

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Bulgaria is rich in sources of mineral water of temperatures in the range of 25 °C–100 °C and various chemical compositions due to diverse geological and hydrogeological conditions. A large portion of the reservoirs of low-mineralisation water is suitable for bottling. Most of them are situated in Southern Bulgaria and related to fractured hydrothermal systems, while in Northern Bulgaria mineral waters of low mineralisation are formed in the relatively shallow levels of artesian aquifers. In the last 30 years, the utilisation of bottled mineral water has increased and, currently, there are at least 18 bottling facilities, while 12 others have closed down for various reasons. The purpose of the present study is to characterise the chemical composition of the Bulgarian mineral waters utilised for bottling, in terms of geological setting, quality, compliance with regulations and possible problems associated with mineral deposition and corrosion. The water type largely depends on the host rocks. In most cases, sodium-type waters are utilized and, in the case of anions, bicarbonate and sulphate. The only exceptions are the waters formed in limestone, dolomite and marble, which are calcium-bicarbonate and calcium-magnesium type.

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“…Различните геолого-структурни и хидрогеоложки условия оказват значение и върху разпределението на топлинното поле в страната -важен фактор за формирането на термалните и минерални води. Съгласното (Velinov, Bojadgieva, 1981;Khutorskoy et al, 2019) с висока степен на увереност може да се предполага повишаване на температурата на една и съща дълбочина от север на юг в Южна България, а в рамките на Мизийската платформа -от запад на изток.…”

Section: минерални води в българияunclassified

Use of geothermal energy and mineral waters in Bulgaria: current status and perspectives

Hristov

2020

Engineering Geology and Hydrogeology

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Summary data on the geological survey, hydrogeological and hydrochemical conditions, as well as on the use of geothermal energy and mineral waters during different periods in Bulgaria are presented. One of the aims of the paper is to present some problems concerning more rational and full application of the available geothermal resources, as well as the management of the existing geothermal resources to protect mineral water from contamination. Some examples are given from other countries (Austria, Russia) with similar hydrogeological conditions in the respective sites, which have smaller hydrothermal resources but use them more fully in the presented cases. Finally, brief information is provided on a new environmental technology for the use of geothermal energy, developed by the Canadian company “Eavor”. This technology could be applied in the near future in a number of areas in Central North and Northwestern Bulgaria where geological conditions are similar.

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Geothermal Data of Bulgaria

Cited by 6 publications

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Heat potential of the Upper Jurassic–Lower Cretaceous aquifer in Central Northern Bulgaria: conditions and prospective use

Heat potential of the Upper Jurassic–Lower Cretaceous aquifer in Central Northern Bulgaria: conditions and prospective use

Mineral water bottling in Bulgaria

Use of geothermal energy and mineral waters in Bulgaria: current status and perspectives

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