Geothermal Field of The Baltic Region
	Geothermal Data
	Enhanced Geothermal Systems
	Klaipėda Geothermal District Heating Station
	Ongoing Research
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	Publications (Lithuania)

Project:

OPPORTUNITY STUDY OF TRANSFORMATION OF THE OIL FIELDS TO THE GEOTHERMAL FIELDS IN WEST LITHUANIA

 Institution:

• Institute of Geology and Geography

(Šliaupa S., Puronas V., Zalaudiene G., Šliaupiene R.)

 Financed by:

• Lithuanian Science and Study Foundation

 Duration:

• 2007.03-12

 Rationale

The main part of the costs of the geothermal stations comprises the drilling and installation of the deep wells. West Lithuania is characterized by anomalously high heat flow. There is a number of the oil fields that reached the tail phase of exploitation. The depth and construction of wells are suitable for exploitation of the geothermal heat. The application of those wells can reduce considerably the costs of the geothermal stations for the district heating. 13 oil fields were analysed.

 Study plan

• overview of the praxis of transformation of the oil fields to the geothermal fields in the world;
• location of the oil fields with respect to the potential users of the geothermal energy, creation of the GIS data base;
• evaluation of needs of the potential users for the geothermal energy;
• creation of DB of the geothermal parameters of the oil fields (temperatures of potential aquifers, depths, etc.).
• reservoir properties of the potential geothermal aquifers (Cambria, Lower Devonian);
• evaluation of the reservoir properties of the geothermal aquifers, identification of the prospective intervals;
• creation of DB of the chemical composition of the formation water of prospective geothermal aquifers, hydrothermal modelling;
• evaluation of contamination of the geothermal aquifers by hydrocarbons;
• inventory of the wells of the oil fields;
• inventory of the construction of the wells;

Results

Only four oil fields (Girkaliai, Genciai, Kretinga, Plunge) are located close to the towns, the potential customers. The data base of the temperature measurements in the oil field wells was compiled. The reservoir properties of the Middle Cambrian, Lower Devonian and Middle-Upper Devonian aquifers were analysed in detailed. The chemical composition of the formation water varies considerably across the area that is important for prediction of the chemical reactions during the exploitation of the thermal water. The study was supported by geothermal chemical modeling. The inventory of the construction of the wells was performed. In most cases the common well completion scheme is applied in west Lithuania. Based on temperature and reservoir data the geothermal heat potential was estimated for the three major aquifers in all oil fields. The largest potential is related to the Lower Devonian aquifer that is in the range of 9-68 MW. The potential of the Middle-Upper Devonian aquifer range in order of 6-28 MW. The deepest Middle Cambrtain reservoir can supply 1-16 MW of heat. The Genciai, Kretinga, and Girkaliai oil fields have the highest priority for the development of the geothermal heat supply stations in west Lithuania.

• Fig.1 (left). Geothermal capacity of Cambrian reservoir of oil fields, MW_th
• Fig.2 (right). Geothermal capacity of Kemeri (Lower Devonian) reservoir of oil fields, MW_th

Fig.3. Geothermal capacity of Sventoji-Upninkai (Middle-Upper Devonian) reservoir of oil fields, MW_th