Influencing factors of rock thermal conductivity and applicability evaluation of its mixing law predictive models

Song, Jiajia; Wang, Guiling; Xing, Linxiao; Qian, Jiazhong; Dai, Lei; He, Dawei

doi:10.1016/j.geothermics.2023.102680

Cited by 8 publications

(3 citation statements)

References 41 publications

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“…Studies on factors affecting the thermal conductivity of rocks encompass both internal factors (rock components and structure) and external factors (temperature and pressure) (Zhu et al 2022). Previous research results indicate that: 1) the thermal conductivity of rocks increases with quartz content (Song et al 2019;Jesse, 2023) and decreases with porosity (Song et al 2023), showing a proportional relationship to mineral grain size (Tavman, 1996); 2) rock thermal conductivity decreases with increasing temperature (Hans-Dieter Vosteen, 2003;Wu et al 2022) and increases with increasing pressure with the latter exerting a smaller effect on thermal conductivity (Seipold and Huenges, 1998); 3) the two factors offset to some extent in high-temperature and highpressure environments.…”

Section: Introductionmentioning

confidence: 92%

Characterization of rock thermophysical properties and factors affecting thermal conductivity−A case study of Datong Basin, China

Ji,

Wei,

Zhang

et al. 2024

Journal of Groundwater Science and Engineering

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Rock thermal physical properties play a crucial role in understanding deep thermal conditions, modeling the thermal structure of the lithosphere, and discovering the evolutionary history of sedimentary basins. Recent advancements in geothermal exploration, particularly the identification of high-temperature geothermal resources in Datong Basin, Shanxi, China, have opened new possibilities. This study aims to characterize the thermal properties of rocks and explore factors influencing thermal conductivity in basins hosting high-temperature geothermal resources. A total of 70 groups of rock samples were collected from outcrops in and around Datong Basin, Shanxi Province. Thermal property tests were carried out to analyze the rock properties, and the influencing factors of thermal conductivity were studied through experiments at different temperature and water-filled states. The results indicate that the thermal conductivity of rocks in Datong, Shanxi Province, typically ranges from 0.690 W/(m•K) to 6.460 W/(m•K), the thermal diffusion coefficient ranges from 0.441 mm 2 /s to 2.023 mm 2 /s, and the specific heat capacity of the rocks ranges from 0.569 KJ/(kg•°C) to 1.117 KJ/(kg•°C). Experimental results reveal the impact of temperature and water saturation on the thermal conductivity of the rock. The thermal conductivity decreases with increasing temperature and rises with high water saturation. A temperature correction formula for the thermal conductivity of different lithologies in the area is proposed through linear fitting. The findings from this study provide essential parameters for the assessment and prediction, development, and utilization of geothermal resources in the region and other basins with typical high-temperature geothermal resource.

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Section: Introductionmentioning

confidence: 92%

Characterization of rock thermophysical properties and factors affecting thermal conductivity−A case study of Datong Basin, China

Ji,

Wei,

Zhang

et al. 2024

Journal of Groundwater Science and Engineering

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“…Collectively, these faults shape the regional tectonic framework and play pivotal roles in geothermal resource formation by acting as thermal and water conduits. Additionally, predominant deposits in the study area comprise Archean metamorphic rock, Upper-Middle Proterozoic carbonate rock, Ordovician-Cambrian, Neogene sandstone, and Quaternary sediment from bottom to top [28]. The Cenozoic cover primarily consists of sandstone, mudstone, and sandy mudstone.…”

Section: Geological Settingmentioning

confidence: 99%

“…(b) Distribution map of faults in the Jizhong Depression. (c) Distribution map of geothermal fluids in the study area (modified from[28,29]).…”

mentioning

confidence: 99%

Hydrogeochemical Characteristics of Geothermal Water in Ancient Deeply Buried Hills in the Northern Jizhong Depression, Bohai Bay Basin, China

Yu,

Tian,

Zhang

et al. 2023

Water

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The Jizhong Depression boasts rich geothermal resources with a lengthy history of geothermal exploitation. Buried hill geothermal reservoirs, which serve as primary thermal sources for hydrothermal resource exploitation, are prevalent in this region and have advantages such as extensive development potential, significant geothermal reservoir capacity, superior water quality, and straightforward recharge. This study investigates the formation and evolution of deep geothermal water in the Jizhong Depression by analyzing the hydrochemical and isotopic data of geothermal water samples collected from buried hill geothermal reservoirs in the northern part of the depression. The findings reveal that the subsurface hot water samples from the carbonate geothermal reservoirs in this region were predominantly weakly alkaline water with a pH ranging between 6.61 and 8.87. The hot water samples collected at the wellhead exhibited temperatures varying from 33.9 °C to 123.4 °C and total dissolved solids (TDS) lying between 473.9 mg/L and 3452 mg/L. Based on the δ2H-δ18O stable isotope analysis, the geothermal fluids in the Jizhong Depression are predominantly sourced from atmospheric precipitation and exist in a somewhat isolated hydrogeological environment, exhibiting pronounced water–rock interactions and deep water circulation (with depths ranging from 1324 m to 3455 m). Through a comparison of various methods, it is deduced that the most appropriate geothermometer for deep karst geothermal reservoirs in the Jizhong Depression is a chalcedony geothermometer, and when using it, the deep reservoir temperature was estimated at 63–137.6 °C. The precipitation in the adjacent mountainous areas enables the groundwater to infiltrate and descend deep into the earth along piedmont faults. Subsequently, lateral runoff over extended periods replenishes the groundwater into the depression. This process allows for the groundwater to fully absorb heat from deep heat sources, resulting in the formation of the deep geothermal reservoirs in the northern Jizhong Depression. The insights obtained from this study offer a theoretical and scientific foundation for the exploitation and utilization of regional geothermal resources and the transformation of the energy structure in China.

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Heat transfer mechanism of TiO2-doped silica aerogel

He,

Zhang,

et al. 2024

Applied Thermal Engineering

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Influencing factors of rock thermal conductivity and applicability evaluation of its mixing law predictive models

Cited by 8 publications

References 41 publications

Characterization of rock thermophysical properties and factors affecting thermal conductivity−A case study of Datong Basin, China

Characterization of rock thermophysical properties and factors affecting thermal conductivity−A case study of Datong Basin, China

Hydrogeochemical Characteristics of Geothermal Water in Ancient Deeply Buried Hills in the Northern Jizhong Depression, Bohai Bay Basin, China

Heat transfer mechanism of TiO2-doped silica aerogel

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