Abstract
BackgroundWe have made an attempt to understand the main mechanism which controls the conductive heat transfer in the Årvollskogen borehole. This has been done in order to determine the 2D subsurface temperature distribution within the deep-seated crystalline rocks and, therefore, to estimate the geothermal potential in the Moss area near Oslo.MethodsAn integrated 2D density, magnetic and conductive thermal analysis has been performed in order to recognise the major structural features and thermal pattern of the crystalline crust.ResultsBased on 2D density and magnetic modelling, a 2D structural model has been constructed for the Moss area. This 2D model has been used during the 2D thermal modelling. The results of the 2D thermal modelling demonstrate that a significant decrease of the Earth’s surface temperatures during the last glaciations still affects the subsurface thermal field of the study area in terms of reduced temperatures within the uppermost crystalline crust. The modelled temperatures are characterised by almost horizontal isotherms without considerable vertical disturbances, reflecting the predominance of subhorizontal layering within the crystalline crust of the Moss area.ConclusionThe 2D density and magnetic modelling, with consideration of all available geological and structural data, allows us to reveal the deep structure of the crystalline crust within the Moss area. According to the results of the 2D thermal modelling, the predicted temperatures within the upper crystalline crust are in the range of expected values for this part of Fennoscandia.
Highlights
We have made an attempt to understand the main mechanism which controls the conductive heat transfer in the Årvollskogen borehole
Results of 2D crustal (2D density and magnetic) modelling The 2D density and magnetic analyses have been applied along Line 1 to reveal the major structural features of the crystalline crust in the vicinity of the Årvollskogen borehole
According to the results of the 2D density modelling, this regional-scale positive gravity anomaly is related to the presence of the highdensity zone within the middle crust which can be at least partially associated with the basin-scale positive gravity anomaly over the axial part of the Oslo Graben (Figure 5)
Summary
We have made an attempt to understand the main mechanism which controls the conductive heat transfer in the Årvollskogen borehole. This has been done in order to determine the 2D subsurface temperature distribution within the deep-seated crystalline rocks and, to estimate the geothermal potential in the Moss area near Oslo. An integrated lithosphere-scale, 2D density, magnetic and conductive thermal analysis has been carried out in order to understand some of the structural features and thermal pattern of the crystalline crust within the Moss area. The 2D density, magnetic and conductive thermal analysis has been carried out along a N-Strending cross-section, called Line 1 (for location, see Figure 2). The cross-section had purposely not been chosen to run in the geologically more representative E-W direction across the major fault of the Oslo Graben due to a lack of detailed geological and gravity data offshore within the Oslofjord (Figures 4 and 5)
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