Lithofazielle Reservoircharakterisierung zur geothermischen Nutzung des Malm im Großraum München

Böhm, Franz; Savvatis, Alexandros; Steiner, U.; Schneider, Michael; Koch, Roman

doi:10.1007/s00767-012-0202-4

Cited by 36 publications

(37 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thermal conductivity, porosity and permeability values presented herein are in good accordance with results of recent studies on a limited number of rock samples from the Molasse Basin (Koch et al, 2007(Koch et al, , 2009Böhm et al 2013).…”

Section: Comparison Of Results From Shallow and Deep Drill Cores And supporting

confidence: 80%

“…This shift indicates a high hydrothermal potential of the deep Malm aquifer system in the Molasse Basin. The assumption of a positive permeability correction within the range of 2-3 magnitudes is also based on pump test data and comparisons of matrix and formation productivity from different deep drilling locations in the Molasse Basin (Böhm et al, 2013;Schulz et al, 2012).…”

Section: Permeability and Porositymentioning

confidence: 99%

See 1 more Smart Citation

Reservoir characterization of the Upper Jurassic geothermal target formations (Molasse Basin, Germany): role of thermofacies as exploration tool

Homuth¹,

Götz

Sass

2015

Geoth. Energ. Sci.

View full text Add to dashboard Cite

Abstract. The Upper Jurassic carbonates of the southern German Molasse Basin are the target of numerous geothermal combined heat and power production projects since the year 2000. A production-orientated reservoir characterization is therefore of high economic interest. Outcrop analogue studies enable reservoir property prediction by determination and correlation of lithofacies-related thermo-and petrophysical parameters. A thermofacies classification of the carbonate formations serves to identify heterogeneities and production zones. The hydraulic conductivity is mainly controlled by tectonic structures and karstification, whilst the type and grade of karstification is facies related. The rock permeability has only a minor effect on the reservoir's sustainability. Physical parameters determined on oven-dried samples have to be corrected, applying reservoir transfer models to water-saturated reservoir conditions. To validate these calculated parameters, a Thermo-Triaxial-Cell simulating the temperature and pressure conditions of the reservoir is used and calorimetric and thermal conductivity measurements under elevated temperature conditions are performed. Additionally, core and cutting material from a 1600 m deep research drilling and a 4850 m (total vertical depth, measured depth: 6020 m) deep well is used to validate the reservoir property predictions. Under reservoir conditions a decrease in permeability of 2-3 magnitudes is observed due to the thermal expansion of the rock matrix. For tight carbonates the matrix permeability is temperature-controlled; the thermophysical matrix parameters are density-controlled. Density increases typically with depth and especially with higher dolomite content. Therefore, thermal conductivity increases; however the dominant factor temperature also decreases the thermal conductivity. Specific heat capacity typically increases with increasing depth and temperature. The lithofacies-related characterization and prediction of reservoir properties based on outcrop and drilling data demonstrates that this approach is a powerful tool for exploration and operation of geothermal reservoirs.

show abstract

Section: Comparison Of Results From Shallow and Deep Drill Cores And supporting

confidence: 80%

Section: Permeability and Porositymentioning

confidence: 99%

Reservoir characterization of the Upper Jurassic geothermal target formations (Molasse Basin, Germany): role of thermofacies as exploration tool

Homuth¹,

Götz

Sass

2015

Geoth. Energ. Sci.

View full text Add to dashboard Cite

show abstract

“…At present, 17 major geothermal power plants are operating in the German Molasse Basin (Agemar et al 2014), of which the biggest part is located in the area around the city of Munich in Bavaria (Böhm et al 2012). In this area, two major thermal anomalies are located, a positive and a negative one, with a temperature difference (ΔT) of up to 40 K at a depth of −3,500 m asl (GeotIS, Agemar et al 2012).…”

mentioning

confidence: 99%

The origin of deep geothermal anomalies in the German Molasse Basin: results from 3D numerical models of coupled fluid flow and heat transport

2017

Self Cite

View full text Add to dashboard Cite

“…The Malm Aquifer in southern Germany has already been proven to be suitable as a geothermal reservoir (Birner et al, 2012;Homuth et al, 2015;Wolfgramm, 2017). However, the overall subsurface database is relatively scarce because it is mainly based on drill cores from exploration wells, of which there are few in areas without hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

From oil field to geothermal reservoir: assessment for geothermal utilization of two regionally extensive Devonian carbonate aquifers in Alberta, Canada

et al. 2018

View full text Add to dashboard Cite

Abstract. The Canadian province of Alberta has one of the highest per capita CO2-equivalent emissions in Canada, predominantly due to the industrial burning of coal for the generation of electricity and mining operations in the oil sands deposits. Alberta's geothermal potential could reduce CO2 emissions by substituting at least some fossil fuels with geothermal energy.The Upper Devonian carbonate aquifer systems within the Alberta Basin are promising target formations for geothermal energy. To assess their geothermal reservoir potential, detailed knowledge of the thermophysical and petrophysical rock properties is needed. An analogue study was conducted on two regionally extensive Devonian carbonate aquifers, the Southesk-Cairn Carbonate Complex and the Rimbey-Meadowbrook Reef Trend, to furnish a preliminary assessment of the potential for geothermal utilization. Samples taken from outcrops were used as analogues to equivalent formations in the reservoir and correlated with core samples of the reservoir. Analogue studies enable the determination and correlation of facies-related rock properties to identify sedimentary, diagenetic, and structural variations, allowing for more reliable reservoir property prediction.Rock samples were taken from several outcrops of Upper Devonian carbonates in the Rocky Mountain Front Ranges and from four drill cores from the stratigraphically equivalent Leduc Formation and three drill cores of the slightly younger Nisku Formation in the subsurface of the Alberta Basin. The samples were analyzed for several thermophysical and petrophysical properties, i.e., thermal conductivity, thermal diffusivity, and heat capacity, as well as density, porosity, and permeability. Furthermore, open-file petrophysical core data retrieved from the AccuMap database were used for correlation.The results from both carbonate complexes indicate good reservoir conditions regarding geothermal utilization with an average reservoir porosity of about 8 %, average reservoir permeability between 10−12 and 10−15 m2, and relatively high thermal conductivities ranging from 3 to 5 W m−1 K−1. The most promising target reservoirs for hydrothermal utilisation are the completely dolomitized reef sections. The measured rock properties of the Leduc Formation in the subsurface show no significant differences between the Rimbey-Meadowbrook Reef Trend and the Southesk-Cairn Carbonate Complex. Differences between the dolomitized reef sections of the examined Leduc and Nisku Formation are also minor to insignificant, whereas the deeper basinal facies of the Nisku Formation differs significantly.In contrast, the outcrop analogue samples have lower porosity and permeability, likely caused by low-grade metamorphism and deformation during the Laramide orogeny that formed the Rocky Mountains. As such, the outcrop analogues are not valid proxies for the buried reservoirs in the Alberta Basin.Taken together, all available data suggest that dolomitization enhanced the geothermal properties, but depositional patterns and other diagenetic events, e.g., fracturing, also played an important role.

show abstract

Lithofazielle Reservoircharakterisierung zur geothermischen Nutzung des Malm im Großraum München

Cited by 36 publications

References 5 publications

Reservoir characterization of the Upper Jurassic geothermal target formations (Molasse Basin, Germany): role of thermofacies as exploration tool

Reservoir characterization of the Upper Jurassic geothermal target formations (Molasse Basin, Germany): role of thermofacies as exploration tool

The origin of deep geothermal anomalies in the German Molasse Basin: results from 3D numerical models of coupled fluid flow and heat transport

From oil field to geothermal reservoir: assessment for geothermal utilization of two regionally extensive Devonian carbonate aquifers in Alberta, Canada

Contact Info

Product

Resources

About