Maren Brehme Publications Content

Publications


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Underlined names are links to current or past GEG members

REFEREED PUBLICATIONS IN JOURNALS

14. 
Asnin, S N, M Nnko, S Josephat, A Mahecha, E Mshiu, G Bertotti, and M Brehme, Identification of water-rock interaction of surface thermal water in Songwe medium temperature geothermal area, Tanzania, Environmental Earth Sciences, 2022. [Download PDF]

13. 
Suherlina, L, J Newson, Y Kamah, and M Brehme, The Dynamic Evolution of the Lahendong Geothermal System in North-Sulawesi, Indonesia. , Geothermics , 105, pp. 1-19, 2022. [Download PDF] [View Abstract]This study uses an integrated approach to characterize the dynamic evolution of the power- producing high-enthalpy geothermal system of Lahendong, North-Sulawesi, Indonesia. Lahendong has two primary reservoirs, the southern and the northern, which have been utilised for electricity production for more than twenty years. The main focus of this study is the characterisation of heat and mass flows in the system with respect to geological structures and permeability distribution. Also, it delineates how the geothermal system has evolved and the spatial variation of the response resulting from prolonged utilization of the reservoirs. This research implemented geological structure analysis on recent surface fault mapping and pre-existing fault studies from literature. Further, the study analysed well data comprising well pressure, enthalpy, drilling program reviews and tracer tests. Hydrochemical investigation compiled new and old surface and subsurface hydrochemical evolution in both the temporal and spatial domain. The results confirm several trends of faults in the study area: NE-SW and NW-SE are the major striking directions, while E-W and N-S are less dominant. The most apparent trends are NE- SW striking strike-slip faults, perpendicular NW-SE thrust faults and N-S and E-W striking normal faults. The faults compartmentalize the reservoir. A comparison of the southern and the northern reservoir shows that the south is more structurally controlled by faults; both reservoirs rely on fractures as permeability provider and are controlled by shallow hydrogeology, derived from the integrated analysis of transient well data. Geochemical analysis shows that the reservoir fluids have generally higher Electrical Conductivity and closer to fluid-rock equilibrium, probably due to boiling. Spring waters have generally become more acidic, which is an expected result of reservoir boiling and increased steam input to near-surface waters. The spatial distribution of changes shows permeability evolution over time and also the role of structural permeability in response to changing reservoir conditions. Observing and recording reservoir data is highly important to understand the reservoir response to production and ensure the long-term sustainability of the system. Additionally, the data is critical for making a major difference in the reservoir management strategy.

12. 
Marko, A, J Madl-Szonyi, and M Brehme, Injection related issues of a doublet system in a sandstone aquifer-A generalized concept to understand and avoid problem sources in geothermal systems, Geothermics, 97/102234, 2021. [Download PDF]

11. 
Martens, S, M Brehme, V Bruckman, C Juhlin, J Miocic, A P Rinaldi, and M Kühn, Preface: Special issue from the Division on Energy, Resources and the Environment at EGU2020: Sharing geoscience online, Advances in Geosciences, 54, pp. 1-5, 2020. [Download PDF]

10. 
Brehme, M, R Giese, L Suherlina, and Y Kamah, Geothermal sweetspots identified in a volcanic lake integrating bathymetry and fluid chemistry, Nature Scientific Reports, 9/16153, 2019. [Download PDF]

9. 
Brehme, M, K Nowak, D Banks, S Petrauskas, R Valickas, K Bauer, N Burnside, and A Boyce, A Review of the Hydrochemistry of a Deep Sedimentary Aquifer and its Consequences for Geothermal Operation – Klaipeda, Lithuania, Geofluids, 2019, 2019. [Download PDF]

8. 
Brehme, M, Geothermal sweetspots identified in a volcanic lake integrating bathymetry and fluid chemistry, Scientific Reports Nature Research, pp. 1-10, 2019. [Download PDF] [View Abstract]We investigate fluid pathways beneath volcanic lakes using bathymetry and geochemical measurements to locate best-possible drilling sites. Highly permeable structures, such as faults, provide fluid channels that are the most suitable access points to the geothermal resource. Accurate mapping of these structures therefore guides the successful targeting of wells. Lakes, rivers or ocean, can hide surface footprints of these permeable structures, such as in our case beneath Lake Linau. High-resolution bathymetry identifies linear and conical discontinuities, which are linked to offshore tectonic structures as confirmed by surrounding outcrops and hot springs. Geochemical measurements document inflow of hot saline acidic water into the lake verifying bathymetry-located highly permeable structures. Integrating onshore well data, our bathymetry and chemical results locates an ideal drilling site into the geothermal reservoir beneath the western shore line of Lake Linau.

7. 
Brehme, M, S Regensburg, P Leary, F Bulut, H Milsch, S Petrauskas, R Valickas, and G Blöcher, Injection-triggered occlusion of flow pathways in geothermal operations, Geofluids, 2018, 2018. [Download PDF]

6. 
Brehme, M, K Bauer, M Nukman, and S Regensburg, Self-organizing maps in geothermal exploration – A new approach for understanding geochemical processes and fluid evolution, Journal of Volcanology and Geothermal Research, 336, pp. 19-32, 2017. [Download PDF]

5. 
Brehme, M, M G Blöcher, M Cacace, Y Kamah, G Zimmermann, and M Sauter, Permeability distribution in the Lahendong geothermal field: A blind fault captured by thermal–hydraulic simulation, Environmental Earth Sciences, 75/1088, pp. 1-11, 2016. [Download PDF]

4. 
Brehme, M, F Deon, C Haase, B Wiegand, Y Kamah, M Sauter, and S Regensburg, Fault controlled geochemical properties in Lahendong geothermal reservoir Indonesia, Grundwasser, 21/1, pp. 29-41, 2016. [Download PDF]

3. 
Deon, F, H J Förster, M Brehme, B Wiegand, T Scheytt, I Moeck, M S Jaya, and D J Putriatni, Geochemical/hydrochemical evaluation of the geothermal potential of the Lamongan volcanic field (Eastern Java, Indonesia), Geothermal Energy, 3/20, pp. 1-21, 2015. [Download PDF]

2. 
Brehme, M, I Moeck, Y Kamah, G Zimmermann, and M Sauter, A hydrotectonic model of a geothermal reservoir – A study in Lahendong, Indonesia, Geothermics, 51, pp. 228-239, 2014. [Download PDF]

1. 
Brehme, M, T Scheytt, and U E Dokuz, Hydrochemical characterization of ground and surface water at Dörtyol/Hatay/Turkey, Environmental Earth Sciences, 63/6, pp. 1395-1408, 2011. [Download PDF]


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PROCEEDINGS REFEREED

7. 
Suherlina, L, D Bruhn, M O Saar, Y Kamah, and M Brehme, Updated Geological and Structural Conceptual Model in High Temperature Geothermal Field, European Geothermal Congress 2022, 2022.

6. 
Kottsova, A, D Bruhn, M O Saar, and M Brehme, Clogging mechanisms in geothermal operations: theoretical examples and an applied study, European Geothermal Congress 2022, (in press).

5. 
Marko, A, M Toth, M Brehme, and J Madl-Szonyi, Assessing reinjection potential of abandoned hydrocarbon wells in the Zala region (SW Hungary) through hydraulic evaluation, European Geothermal Congress 2022, (in press).

4. 
Huenges, E, J Ellis, S Welter, R Westaway, K Min, A Genter, M Brehme, H Hofmann, P Meier, B Wassing, and M Marti, Demonstration of soft stimulation treatments in geothermal reservoirs, Proceedings World Geothermal Congress 2021, 2021.

3. 
Suherlina, L, M Brehme, J Newson, Y Kamah, I M Galeczka, and A Wibowo, Characterizing reservoir dynamics using hydrochemical and structural-geological data in a high-enthalpy geothermal system, Indonesia, Proceedings World Geothermal Congress 2021, 2021.

2. 
Marko, A, A Galsa, B Czauner-Zentai, M Brehme, and J Madl-Szonyi, Geothermal Reinjection Problems from a Basin-scale Hydrogeological Perspective, Proceedings World Geothermal Congress 2021, 2021.

1. 
Brehme, M, K Nowak, A Marko, S Istvan, C Willems, and E Huenges, Injection triggered occlusion of flow pathways in a sedimentary aquifer in Hungary, Proceedings World Geothermal Congress 2021, 2021.


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PROCEEDINGS NON-REFEREED

3. 
Hau, K.P., F. Games, R. Lathion, M. Brehme, and M.O. Saar, On the feasibility of producing geothermal energy at an intended CO2 sequestration field site in Switzerland, European Geothermal Congress 2022, 2022. [View Abstract]The global climate crisis is caused by the increasing concentration of greenhouse gases in the atmosphere. Carbon, Capture, and Storage (CCS) has been identified as a key technology towards reaching a climate-neutral society. So far, however, the widespread, large-scale deployment of CCS has been prevented, among other things, by its uneconomical nature. (Zapantis et al., 2019). To increase the economic efficiency of CCS, the stored CO2 could additionally be used as a circulating fluid for geothermal power production, turning CCS into simultaneous Carbon, Capture, Utilization and Storage (CCUS). The concept of CO2-Plume Geothermal (CPG) for permanently isolating and using CO2 at the same time was first introduced by Randolph and Saar in 2011. So far CPG has not been tested at the field scale. This study aims at demonstrating the feasibility of CPG for a site in Western Switzerland. First, the study conceptually investigates the CPG power capacity at the study site. Next, a conceptual 3D model is created using an interpreted seismic anticline structure in the Triassic sediments of the Swiss Molasse Basin. We conduct multi-phase fluid flow simulations based on the conceptual geologic model to simulate realistic CO2 circulation. Injection and production rates for multiple well configurations are assessed to calculate the expected geothermal energy production. The obtained results will provide an assessment of the general site suitability and storage capacity for long-term CCUS. Also, these results will enable an estimation of the CPG potential and geothermal power output of the site.

2. 
Brehme, M, M O Saar, E Slob, P Bombarda, H Maurer, F Wellmann, P Vardon, D Bruhn, and E Team, EASYGO-Efficiency and Safety in Geothermal Operations-A new Innovative Training Networ, EGU General Assembly Conference Abstracts, EGU21-15437, 2021.

1. 
Asnin, S N, M Nnko, S Josephat, A Mahecha, E Mshiu, G Bertotti, and M Brehme, Fluid Flow Modeling using Geochemistry to Characterize the Songwe Medium Temperature Geothermal -Tanzania, EGU General Assembly Conference Abstracts , EGU21-9766, 2021.


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THESES

1. 
Brehme, M, The role of fault zones on structure, operation and prospects of geothermal reservoirs-A case study in Lahendong, Indonesia, Dissertation, 2015.