Sustainable electricity generation from an Enhanced Geothermal System considering reservoir heterogeneity and water losses with a discrete fractures model

Zinsalo, Joël M.; Lamarche, Louis; Raymond, Jasmin

doi:10.1016/j.applthermaleng.2021.116886

Cited by 27 publications

(10 citation statements)

References 56 publications

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“…Due to the difference in hydrodynamic conditions and transport distances in each sedimentary environment, skeleton composition, grain structure, and impurity content of different microfacies sand bodies have different characteristics, which also have a profound influence on the evolution sequence and degree of burial diagenesis (Jiang et al, 2004;Li et al, 2010). With the increase in shale content and the decrease of average grain size, the diagenetic compaction becomes more intense (Wu et al, 2020;ZinsaloJoël et al, 2021). The physical properties of the distributary channel, mouth bar, distal bar, and sheet sand reservoir at the same buried depth become worse successively.…”

Section: Influencing Factors Of Lowpermeability Reservoir 431 Influen...mentioning

confidence: 99%

Densification mechanism of deep low-permeability sandstone reservoir in deltaic depositional setting and its implications for resource development: A case study of the Paleogene reservoirs in Gaoshangpu area of Nanpu sag, China

Wang

Yang²,

Lu³

et al. 2022

Front. Earth Sci.

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A better understanding of reservoir densification mechanisms is very important for petroleum exploration and controlling the reservoir quality distribution in low-permeability reservoirs. Low porosity and low permeability, difficult reconstruction, and economic infeasibility are important factors restricting its efficient production. Systematic analysis was performed to study the evolution of different microfacies in the deltaic depositional setting of the Paleogene deep low-permeability Gaoshangpu reservoir, define their genetic mechanisms, delineate the dominant facies belts, and define the favorable diagenetic sequences that are important for exploration of high-quality reservoirs. To understand the tight genesis of the low-permeability reservoirs, we analyzed the sedimentological and diagenetic evolution characteristics of various microfacies (i.e., underwater distributary channel, distributary bay, mouth bar, and front sheet sand) using core data and physical property analysis of the reservoir sand body. The results show the underwater distributary channel and estuary bar sand body with medium-to fine-grained and poor–medium sorting. The diagenesis is dominated by strong compaction, calcareous, argillaceous cementation, and dissolution during stage B in early diagenesis and stage A in middle diagenesis. In the fan delta environment, the weak anti-compaction resistance of low-permeability reservoirs is mainly due to the large content of plastic particles, finer grain size, and medium–poor sorting, with an average porosity reduction rate of 65%. This is a key factor for densification of reservoirs above 3000 m. Comparison among different sandstone microfacies of the deltaic setting shows that the sand body of the underwater distributary channel with low shale content has slightly stronger compaction resistance. The porosity reduction is not obvious at the depth of 3,000–4,000 m, but the loss of permeability at this depth section is significant, and the reservoir improvement from later dissolution is most obvious at this depth section. Calcareous cementation is the cause for densification of some mouth bars in the early stage and of underwater distributary channels in the middle and late stage. Under the influence of strong compaction and calcareous-filling pore throat, the sand body of the mouth bar has been basically densified at 3,000 m, resulting in limited reservoir transformation from later dissolution. The study shows that compaction is the main cause of reservoir densification, argillaceous and calcareous cementation is the secondary cause, and later dissolution is another main cause of reservoir enhancement. The research results can provide a reference and direction for reservoir development and search for the high-quality sweet spot in the deep and low-permeability reservoir.

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Section: Influencing Factors Of Lowpermeability Reservoir 431 Influen...mentioning

confidence: 99%

Densification mechanism of deep low-permeability sandstone reservoir in deltaic depositional setting and its implications for resource development: A case study of the Paleogene reservoirs in Gaoshangpu area of Nanpu sag, China

Wang

Yang²,

Lu³

et al. 2022

Front. Earth Sci.

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“…Figures 10, 11 jointly reveal that geothermal research started with concept establishment, geophysical exploration, and geochemical exploration in the early stages (Studt and Thompson, 1969;Ólafur and Saemundsson, 1993;Tanaka, 2004) and then focused on the utilization and improvement of the thermal performance of hydrothermal geothermal resources (Qin et al, 2005;Han et al, 2010;Aneke et al, 2011;Saar, 2011). In recent years, mathematical statistics and big data analytics have been combined to generate numerical simulations and system optimizations of geothermal resources to attain the use and development of hot dry rock resources (Zeng et al, 2017;Song et al, 2018;Zhou et al, 2019;Liu et al, 2021;Aliyu and Archer, 2021;Zinsalo et al, 2021) and promote the establishment of geothermal power stations.…”

Section: Theme Evolutionmentioning

confidence: 99%

Visualization Analysis on the Current Status and Development Trend of Geothermal Research: Insights Into the Database of Web of Science

2022

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Geothermal energy is considered a renewable, clean, and environmentally friendly energy source. In addition, it is efficient and relatively cost effective. Therefore, the demand for the development and utilization of geothermal resources is increasing annually. To understand the current status and developments within the context of geothermal research, quantitative and qualitative analyses were carried out by combining two visualization software applications, namely, VOSviewer and CiteSpace; this analysis also entailed the secondary development of R language. The results showed that the USA, China, and Germany are the main contributors to geothermal research. We also found that geothermal research hot spots encompass five geothermal research clusters, such as renewable energy utilization, heat flow, numerical simulation, geochemistry, and groundwater. In addition, the strategic diagram and thematic structure revealed how geothermal research has evolved over time. Finally, the timeline view and burst term highlight the possible frontiers of geothermal power generation, enhanced geothermal systems, and ecological environment protection. These insights will provide scholars and policymakers with a systematic understanding of the current research and directions for future studies.

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“…Scholars have carried out researches on the influence of pumping and irrigation well layout on the groundwater flow field and temperature field 19 , the influence of pumping and irrigation well distribution mode, and pumping and irrigation well water quantity on heat transfer characteristics of underground heat exchanger well 20 , 21 , and the application of numerical simulation of water and heat transport to optimize pumping and irrigation well the layout of groundwater source heat pump system 22 , numerical simulation of water-heat coupling of single well ground water source heat pump in T2Well 23 and optimization of reasonable well spacing and layout of shallow source heat pump simulated by sand tank-taking Jiuxi in Fenglin as an example 24 . Sustainable electricity generation from an enhanced geothermal system were carried out considering reservoir heterogeneity and water losses with a discrete fracture model 25 and enhanced geothermal systems (EGS): hydraulic fracturing in a thermoporoelastic framework 26 and modified zipper fracturing in an enhanced geothermal system reservoir and heat extraction optimization via orthogonal design 27 . Again, Xu et al 28 Studied on optimal arrangement of pumping and irrigation systems for a groundwater heat pump.…”

Section: Introductionmentioning

confidence: 99%

A new mathematical modeling approach for thermal exploration efficiency under different geothermal well layout conditions

Gao

Shi

2021

Sci Rep

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The water temperature at the outlet of the production well is an important index for evaluating efficient geothermal exploration. The arrangement mode of injection wells and production wells directly affects the temperature distribution of the production wells. However, there is little information about the effect of different injection and production wells on the temperature field of production wells and rock mass, so it is critical to solve this problem. To study the influence mechanism of geothermal well arrangement mode on thermal exploration efficiency, the conceptual model of four geothermal wells is constructed by using discrete element software, and the influence law of different arrangement modes of four geothermal wells on rock mass temperature distribution is calculated and analyzed. The results indicated that the maximum water temperature at the outlet of the production well was 84.0 °C due to the thermal superposition effect of the rock mass between the adjacent injection wells and between the adjacent production wells. Inversely, the minimum water temperature at the outlet of the production well was 50.4 °C, which was determined by the convection heat transfer between the water flow and the rock between the interval injection wells and the interval production wells. When the position of the model injection well and production well was adjusted, the isothermal number line of rock mass was almost the same in value, but the direction of water flow and heat transfer was opposite. The study presented a novel mathematical modeling approach for calculating thermal exploration efficiency under various geothermal well layout conditions.

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Sustainable electricity generation from an Enhanced Geothermal System considering reservoir heterogeneity and water losses with a discrete fractures model

Cited by 27 publications

References 56 publications

Densification mechanism of deep low-permeability sandstone reservoir in deltaic depositional setting and its implications for resource development: A case study of the Paleogene reservoirs in Gaoshangpu area of Nanpu sag, China

Densification mechanism of deep low-permeability sandstone reservoir in deltaic depositional setting and its implications for resource development: A case study of the Paleogene reservoirs in Gaoshangpu area of Nanpu sag, China

Visualization Analysis on the Current Status and Development Trend of Geothermal Research: Insights Into the Database of Web of Science

A new mathematical modeling approach for thermal exploration efficiency under different geothermal well layout conditions

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