Effect of water saturation and temperature in the range of 193 to 373K on the thermal conductivity of sandstone

Guo, Pingye; Zhang, N.; He, Manchao; Bai, Baojun

doi:10.1016/j.tecto.2017.01.024

Cited by 22 publications

(14 citation statements)

References 33 publications

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“…The measurements allowed us to observe a first-order relation between the thermal conductivities of the samples and their porosities for all lithologies: thermal conductivity decreases with increasing porosity as observed in previous studies (Popov et al 2003;Nagaraju and Roy 2014;Guo et al 2017;Mielke et al 2017).…”

Section: Dry-state Samples At Ambient Temperaturesupporting

confidence: 58%

“…The thermal conductivity of the rocks depends not only on mineralogical composition and microstructure (porosity, fracture density, texture), but also on pressure, rock temperature and degree of saturation and nature of the fluid. The effect of those parameters on thermal conductivity have been largely investigated by previous studies, which showed that the thermal conductivity of rocks generally decreases with increasing porosity (Woodside and Messmer 1961;Popov et al 2003;Nagaraju and Roy 2014;Guo et al 2017;Mielke et al 2017), whereas pressure tends to reduce porosity, close (micro)cracks and improve heat transport at grain-grain contacts and, thus, increase thermal conductivity (Walsh and Decker 1966;Abdulagatova et al 2009;Schön and Dasgupta 2015). On the contrary, high temperature tends to decrease the thermal conductivity of rocks due to differential thermal expansion of the minerals, which may increase contact resistances between the grains and result in thermal cracking creating porosity (Vosteen and Schellschmidt 2003;Abdulagatov et al 2006;Abdulagatova et al 2009;Guo et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The effect of those parameters on thermal conductivity have been largely investigated by previous studies, which showed that the thermal conductivity of rocks generally decreases with increasing porosity (Woodside and Messmer 1961;Popov et al 2003;Nagaraju and Roy 2014;Guo et al 2017;Mielke et al 2017), whereas pressure tends to reduce porosity, close (micro)cracks and improve heat transport at grain-grain contacts and, thus, increase thermal conductivity (Walsh and Decker 1966;Abdulagatova et al 2009;Schön and Dasgupta 2015). On the contrary, high temperature tends to decrease the thermal conductivity of rocks due to differential thermal expansion of the minerals, which may increase contact resistances between the grains and result in thermal cracking creating porosity (Vosteen and Schellschmidt 2003;Abdulagatov et al 2006;Abdulagatova et al 2009;Guo et al 2017). Finally, thermal conductivity increases with water saturation compared to dry conditions as water conducts heat much better than air (Zimmerman 1989;Popov et al 2003;Schütz et al 2012;Nagaraju and Roy 2014;Guo et al 2017;Albert et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, high temperature tends to decrease the thermal conductivity of rocks due to differential thermal expansion of the minerals, which may increase contact resistances between the grains and result in thermal cracking creating porosity (Vosteen and Schellschmidt 2003;Abdulagatov et al 2006;Abdulagatova et al 2009;Guo et al 2017). Finally, thermal conductivity increases with water saturation compared to dry conditions as water conducts heat much better than air (Zimmerman 1989;Popov et al 2003;Schütz et al 2012;Nagaraju and Roy 2014;Guo et al 2017;Albert et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Heat flow density estimates in the Upper Rhine Graben using laboratory measurements of thermal conductivity on sedimentary rocks

et al. 2019

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The Upper Rhine Graben (URG) has been extensively studied for geothermal exploitation over the past decades. Yet, the thermal conductivity of the sedimentary cover is still poorly constrained, limiting our ability to provide robust heat flow density estimates. To improve our understanding of heat flow density in the URG, we present a new large thermal conductivity database for sedimentary rocks collected at outcrops in the area including measurements on (1) dry rocks at ambient temperature (dry); (2) dry rocks at high temperature (hot) and (3) water-saturated rocks at ambient temperature (wet). These measurements, covering the various lithologies composing the sedimentary sequence, are associated with equilibrium-temperature profiles measured in the Soultz-sous-Forêts wells and in the GRT-1 borehole (Rittershoffen) (all in France). Heat flow density values considering the various experimental thermal conductivity conditions were obtained for different depth intervals in the wells along with average values for the whole boreholes. The results agree with the previous heat flow density estimates based on dry rocks but more importantly highlight that accounting for the effect of temperature and water saturation of the formations is crucial to providing accurate heat flow density estimates in a sedimentary basin. For Soultz-sous-Forêts, we calculate average conductive heat flow density to be 127 mW/m 2 when considering hot rocks and 184 mW/m 2 for wet rocks. Heat flow density in the GRT-1 well is estimated at 109 and 164 mW/m 2 for hot and wet rocks, respectively. Results from the Rittershoffen well suggest that heat flow density is nearly constant with depth, contrary to the observations for the Soultz-sous-Forêts site. Our results show a positive heat flow density anomaly in the Jurassic formations, which could be explained by a combined effect of a higher radiogenic heat production in the Jurassic sediments and thermal disturbance caused by the presence of the major faults close to the Soultz-sous-Forêts geothermal site. Although additional data are required to improve these estimates and our understanding of the thermal processes, we consider the heat flow densities estimated herein as the most reliable currently available for the URG.

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Section: Dry-state Samples At Ambient Temperaturesupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heat flow density estimates in the Upper Rhine Graben using laboratory measurements of thermal conductivity on sedimentary rocks

et al. 2019

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“…Based on compression strength, chemical composition, water absorption and the studies conducted by Huang and Qin et al [8,37], the rock samples should belong to medium-grained sandstone, which is the characteristic stone in Yungang area. As one of the most common rock types in Northern China, medium-grained sandstone has good integrity and availability; many cliff statues were cut using this type of sandstone [38,39]. However, since mediumgrained sandstone has shorter diagenesis, lower intensity, and more cements, the relics made from them deteriorate relatively faster and to a greater extent than grottoes of other lithologies (such as limestone) under the influence of natural and human factors [40,41].…”

Section: The Compression Strength Water Absorption and Effective Pormentioning

confidence: 99%

Acid solution decreases the compressional wave velocity of sandstone from the Yungang Grottoes, Datong, China

et al. 2019

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To understand the effects of an acidic environment on the internal structure of sandstone from the Yungang Grottoes, Datong, China, the physicochemical properties of fresh and weathered sandstone samples and their compressional wave (P-wave) velocities in response to different concentrations of H 2 SO 4 and HNO 3 solution were investigated. X-ray diffraction (XRD) and a scanning electron microscope equipped with energy dispersive X-ray spectrometer (SEM-EDX) were used to determine grain morphology and chemical composition. The results show that the sandstone, which mainly consists of silicon dioxide and calcium carbonate, became more complicated in composition after weathering. A nonmetallic ultrasonic detector was used to measure the P-wave velocities of sandstones in a natural state and soaked with ultrapure water and with H 2 SO 4 and HNO 3 at concentrations of 0.2 mol L −1 , 0.4 mol L −1 , and 0.8 mol L −1 , respectively. For the acid-treated groups, with increasing acidity, P-wave velocity decreased significantly, compressive strength decreased and effective porosity increased; these behaviours are different from those of the water-treat group, implying that the acid solutions damaged the microstructure of the sandstone. The results suggest that the deterioration risk of H 2 SO 4 and HNO 3 , or sulfates and nitrates converted from ambient SO 2 , NO x and PM 2.5 , on the stone relics in the Yungang Grottoes should be a cause for concern.

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Effect of High Temperatures on the Thermal Properties of Granite

et al. 2019

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Effect of water saturation and temperature in the range of 193 to 373K on the thermal conductivity of sandstone

Cited by 22 publications

References 33 publications

Heat flow density estimates in the Upper Rhine Graben using laboratory measurements of thermal conductivity on sedimentary rocks

Heat flow density estimates in the Upper Rhine Graben using laboratory measurements of thermal conductivity on sedimentary rocks

Acid solution decreases the compressional wave velocity of sandstone from the Yungang Grottoes, Datong, China

Effect of High Temperatures on the Thermal Properties of Granite

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