Influential factors on the development of a low-enthalpy geothermal reservoir: A sensitivity study of a realistic field

Wang, Yang; Voskov, Denis; Khait, Mark; Saeid, Sanaz; Bruhn, David

doi:10.1016/j.renene.2021.07.017

Cited by 20 publications

(8 citation statements)

References 34 publications

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“…Since we consider a regular grid (squares) and we want to provide a conservative estimate, we consider the squared variant of circular packing, representing a density of around 80%. (11) As with almost all energy storage systems, we have to consider energy losses. Although the thermal energy stored in aquifers is not lost, since the thermal energy remains in the subsurface, not all of the stored energy can be recovered, as the heat in the aquifer is present at a lower temperature level.…”

Section: Methodsmentioning

confidence: 99%

“…Optionally, conversion efficiency, plant lifetime, and plant load factor could be considered but were omitted since these are only increasing the uncertainty in the output data. Another important factor when looking at the HIP of a certain reservoir is the consideration of the over-and under-burden rock, effectively increasing the estimated potential due to conductive heat transport [11,12]. We do not consider this parameter, since it introduces uncertainty again, and the method presented in this paper only serves to outline areas of higher and lower potential, which should then undergo further investigation for their appropriateness for actual site development.…”

Section: Geothermal Potential-heat In Placementioning

confidence: 99%

“…Since the results presented in this paper are most powerful in identifying trends and regions, any local study should undergo a crucial examination of the temperature predictions in this area. As stated in the Introduction, this paper does not consider over-or under-burden rocks and their effects on the HIP [11,12]. Here, the estimates given in the Results section of this paper would likely be higher on average since a reheating of the reinjected fluid would increase the potential energy retained in the reservoir and should be considered in more detailed studies of the regions identified in this paper.…”

Section: Data Availability and Quality Limitationsmentioning

confidence: 99%

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Geothermal Resources and ATES Potential of Mesozoic Reservoirs in the North German Basin

et al. 2022

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Mesozoic sandstone aquifers in the North German Basin offer significant potential to provide green and sustainable geothermal heat as well as large-scale storage of heat or chill. The determination of geothermal and subsurface heat storage potentials is still afflicted with obstacles due to sparse and partly uncertain subsurface data. Relevant data include the structural and depositional architecture of the underground and the detailed petrophysical properties of the constituting rocks; both are required for a detailed physics-based integrated modeling and a potential assessment of the subsurface. For the present study, we combine recently published basin-wide structural interpretations of depth horizons of the main stratigraphic formations, with temperature data from geological and geostatistical 3D models (i.e., CEBS, GeotIS). Based on available reservoir sandstone facies data, additional well-log-based reservoir lithology identification, and by providing technical boundary conditions, we calculated the geothermal heat in place and the heat storage potential for virtual well doublet systems in Mesozoic reservoirs. This analysis reveals a large potential for both geothermal heating and aquifer thermal energy storage in geologically favorable regions, and in many areas with a high population density or a high heat demand. Given the uncertainties in the input data, the applied methods and the combination of data from different sources are most powerful in identifying promising regions for economically feasible subsurface utilization, and will help decrease exploration risks when combined with detailed geological site analysis beforehand.

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Section: Methodsmentioning

confidence: 99%

Section: Geothermal Potential-heat In Placementioning

confidence: 99%

Section: Data Availability and Quality Limitationsmentioning

confidence: 99%

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Geothermal Resources and ATES Potential of Mesozoic Reservoirs in the North German Basin

et al. 2022

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“…In the case of Pb5f, breakthrough time is also slightly delayed, while retaining higher temperatures at the end of 100 years. We attribute this behaviour to the impact of small scale variability within facies, which introduces small areas of lower than average permeability where Darcy velocity decreases and thermal recharge can be higher resulting in delayed breakthrough (Daniilidis et al, 2020b;Wang et al, 2021).…”

Section: Small-scale Variability Impactmentioning

confidence: 99%

Influence of process-based, stochastic and deterministic methods for representing heterogeneity in fluvial geothermal systems

et al. 2023

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“…For this purpose, reservoir simulation is typically used to predict the development of the cold plume in many production scenarios [17]. However, uncertainty in the petrophysical characteristics of the reservoir, such as its porosity and permeability, can lead to predictions that differ from actual future production [18]. Therefore, it is necessary to monitor the cold plume in real-time to calibrate reservoir simulations and predict energy production more accurately.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Controlled-Source Electromagnetic Method for Monitoring Low-Enthalpy Geothermal Reservoirs

Eltayieb,

Werthmüller,

Drijkoningen

et al. 2023

Applied Sciences

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Tracking temperature changes by measuring the resulting resistivity changes inside low-enthalpy reservoirs is crucial to avoid early thermal breakthroughs and maintain sustainable energy production. The controlled-source electromagnetic method (CSEM) allows for the estimation of sub-surface resistivity. However, it has not yet been proven that the CSEM can monitor the subtle resistivity changes typical of low-enthalpy reservoirs. In this paper, we present a feasibility study considering the CSEM monitoring of 4–8 Ω·m resistivity changes in a deep low-enthalpy reservoir model, as part of the Delft University of Technology (TU Delft) campus geothermal project. We consider the use of a surface-to-borehole CSEM for the detection of resistivity changes in a simplified model of the TU Delft campus reservoir. We investigate the sensitivity of CSEM data to disk-shaped resistivity changes with a radius of 300, 600, 900, or 1200 m at return temperatures equal to 25, 30, …, 50 °C. We test the robustness of CSEM monitoring against various undesired effects, such as random noise, survey repeatability errors, and steel-cased wells. The modelled differences in the electric field suggest that they are sufficient for the successful CSEM detection of resistivity changes in the low-enthalpy reservoir. The difference in monitoring data increases when increasing the resistivity change radius from 300 to 1200 m or from 4 to 8 Ω·m. Furthermore, all considered changes lead to differences that would be detectable in CSEM data impacted by undesired effects. The obtained results indicate that the CSEM could be a promising geophysical tool for the monitoring of small resistivity changes in low-enthalpy reservoirs, which would be beneficial for geothermal energy production.

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Influential factors on the development of a low-enthalpy geothermal reservoir: A sensitivity study of a realistic field

Cited by 20 publications

References 34 publications

Geothermal Resources and ATES Potential of Mesozoic Reservoirs in the North German Basin

Geothermal Resources and ATES Potential of Mesozoic Reservoirs in the North German Basin

Influence of process-based, stochastic and deterministic methods for representing heterogeneity in fluvial geothermal systems

Feasibility Study of Controlled-Source Electromagnetic Method for Monitoring Low-Enthalpy Geothermal Reservoirs

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