| Citation: |
MA Zihan, XING Huilin, JIN Guodong, TAN Yuyang, YAN Weichao, LI Sihai. A study of numerical simulations for enhanced geothermal reservoir parameters and thermal extraction based on microseismic data[J]. Hydrogeology & Engineering Geology, 2022, 49(6): 190-199. doi: 10.16030/j.cnki.issn.1000-3665.202112010
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A study of numerical simulations for enhanced geothermal reservoir parameters and thermal extraction based on microseismic data
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Abstract
The development of clean, stable, and renewable hot dry rock geothermal energy is significant for alleviating the energy crisis, reducing environmental pollution, and improving human health. Enhanced geothermal system (EGS) is an advanced technology for developing geothermal energy efficiently by stimulating hot dry rock reservoir. This technology involves a complex hydro-thermal coupling process. A numerical approach is usually applied for analyzing heat extraction. In this paper, taking the geothermal reservoir of the Cooper basin in Australia as the research object, two models–a 3D zonal homogeneous permeability model and a heterogenious permeability model – are established based on the measured microseismic data of hydraulic fracturing. The latter one is inversed from microseismic data. The temperature field, seepage field and thermal performance of the reservoir are numerically studied, and their differences are compared and analyzed. The results show that with the same injection-production flow rate, fluid flows more quickly from the injection well to the production well while the temperature drops relatively more rapidly in the inhomogeneous model due to the dominant channel revealed by dense microseismic events near the wellbore. In the homogeneous model, the dominant flow channel is not as pronounced as in the previous model, and the temperature decreases more slowly. During the operation of the geothermal reservoir model, the change in heat recovery of the zonal homogeneous model is relatively stable, with a decline of 3.74%, and that of the inhomogeneous model is rather obvious, with a decline of 12.72%. Compared with the inhomogeneous model, a smaller temperature drop and a higher heat recovery exist in the homogeneous model. However, the permeability in the actual reservoir is uneven, and the simulated heat recovery of the zonal homogenization model is higher than the actual recovery. Therefore, the simulation results of the inhomogeneous model have more reference significance for practical engineering.
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Keywords:
- EGS /
- microseismic data /
- permeability /
- hydro-thermal coupling /
- numerical simulation
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References
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MA Zihan, XING Huilin, JIN Guodong, TAN Yuyang, YAN Weichao, LI Sihai. A study of numerical simulations for enhanced geothermal reservoir parameters and thermal extraction based on microseismic data[J]. Hydrogeology & Engineering Geology, 2022, 49(6): 190-199. doi: 10.16030/j.cnki.issn.1000-3665.202112010
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Figure 1.
Geothermal reservoir region to be studied in Cooper basin (modified from [12, 24])
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Figure 2.
Homogeneous model (a) and homogeneous model profile view (b)
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Figure 3.
Locations of H01 and H03 in the model
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Figure 4.
Permeability distribution for the heterogeneous model (a) and permeability profile (b)
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Figure 5.
Contour surface view of permeability distribution (a) and isosurface profile of permeability distribution (b)
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Figure 6.
Velocity distribution of different models (the upper is the zonal homogeneous model and the bottom is the heterogeneous model)
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Figure 7.
Permeability distribution at the section z=4250 m in the heterogeneous model
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Figure 8.
Isosurface of temperature variation with time in different models
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Figure 9.
Comparison of the bottom hole temperature of production wells and heat extraction comparison in the two models