ISRM Suggested Methods for Determining Thermal Properties of Rocks from Laboratory Tests at Atmospheric Pressure

Popov, Y.; Beardsmore, Graeme; Clauser, Christoph; Roy, Sukanta

doi:10.1007/s00603-016-1070-5

Cited by 117 publications

(76 citation statements)

References 28 publications

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“…Special thermal conductivity measurements were carried out in reference materials with known thermal conductivities to evaluate the uncertainty (quantitative expression of the accuracy [49]) of the KD-2 tool and its applicability for measuring the thermal parameters ( Table 2). The thermal conductivities of the reference materials (quartz glass, limestone and marble), air-dried at room temperature (20 to 25 • C) and fit for such measurements [50], were measured by optical scanning [51] an accuracy of 2%, at a confidence level of 0.95, the needle probe was coated with an inert thermal transfer paste, of~0.8 W/(m·K), to improve the thermal contact between the probe and the tested samples. The calibration showed that the thermal conductivity measured with the KD-2 probe was 7% underestimated for both water and glycerin.…”

Section: Methodsmentioning

confidence: 99%

Thermal Conductivity of Frozen Sediments Containing Self-Preserved Pore Gas Hydrates at Atmospheric Pressure: An Experimental Study

Chuvilin

Bukhanov

2019

Geosciences

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The paper presents the results of an experimental thermal conductivity study of frozen artificial and natural gas hydrate-bearing sediments at atmospheric pressure (0.1 MPa). Samples of hydrate-saturated sediments are highly stable and suitable for the determination of their physical properties, including thermal conductivity, due to the self-preservation of pore methane hydrate at negative temperatures. It is suggested to measure the thermal conductivity of frozen sediments containing self-preserved pore hydrates by a KD-2 needle probe which causes very little thermal impact on the samples. As shown by the special measurements of reference materials with known thermal conductivities, the values measured with the KD-2 probe are up to 20% underestimated and require the respective correction. Frozen hydrate-bearing sediments differ markedly in thermal conductivity from reference frozen samples of the same composition but free from pore hydrate. The difference depends on the physical properties of the sediments and on changes in their texture and structure associated with the self-preservation effect. Namely, it increases proportionally to the volumetric hydrate content, hydrate saturation, and the percentage of water converted to hydrate. Thermal conductivity is anisotropic in core samples of naturally frozen sediments that enclose visible ice-hydrate lenses and varies with the direction of measurements with respect to the lenses. Thermal conductivity measurements with the suggested method provide a reliable tool for detection of stable and relict gas hydrates in permafrost.

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Section: Methodsmentioning

confidence: 99%

Thermal Conductivity of Frozen Sediments Containing Self-Preserved Pore Gas Hydrates at Atmospheric Pressure: An Experimental Study

Chuvilin

Bukhanov

2019

Geosciences

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“…To ensure reproducibility the plugs were Figure 5. Scheme for thermal conductivity measurements of the analyzed core samples according to Popov et al (1999), retrieved from Sass and Götz (2012). measured in oven-dry conditions and cooled down to room temperature in a desiccator (20 • C).…”

Section: Methodsmentioning

confidence: 99%

“…For the determination of thermal conductivity and thermal diffusivity a thermal conductivity scanner was used (Popov et al, 1999), allowing for nondestructive and contactless measurements by using infrared sensors. To minimize the transmission of optical heater radiation to reference standards and rock samples resulting from optical transparent surfaces (Popov et al, 2016), black paint was applied along a scan line on the sample surfaces and on the standards. Both parameters Gap Lake Fairholme Complex Peechee and Cairn-Perdrix D3were measured three to four times on each plug (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…However, while facies, diagenesis, and structure are well characterized and found to be amazingly variable across the basin (e.g., Switzer et al, 1994;Machel, 2010), the potential of the Devonian strata as geothermal reservoirs has not been assessed or only in a very superficial manner (e.g., . Accurate thermal properties are critical parameters for a reliable geothermal assessment (Popov et al, 2016). The aim of this work was to create an initial data set of rock properties (relevant to geothermal modelling) specific to the Upper Devonian aquifer systems which have become of particular inter-L. M. Weydt et al: From oil field to geothermal reservoir est for geothermal utilization and also for identifying variations in rock properties within the reservoir.…”

Section: Introductionmentioning

confidence: 99%

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From oil field to geothermal reservoir: assessment for geothermal utilization of two regionally extensive Devonian carbonate aquifers in Alberta, Canada

et al. 2018

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Abstract. The Canadian province of Alberta has one of the highest per capita CO2-equivalent emissions in Canada, predominantly due to the industrial burning of coal for the generation of electricity and mining operations in the oil sands deposits. Alberta's geothermal potential could reduce CO2 emissions by substituting at least some fossil fuels with geothermal energy.The Upper Devonian carbonate aquifer systems within the Alberta Basin are promising target formations for geothermal energy. To assess their geothermal reservoir potential, detailed knowledge of the thermophysical and petrophysical rock properties is needed. An analogue study was conducted on two regionally extensive Devonian carbonate aquifers, the Southesk-Cairn Carbonate Complex and the Rimbey-Meadowbrook Reef Trend, to furnish a preliminary assessment of the potential for geothermal utilization. Samples taken from outcrops were used as analogues to equivalent formations in the reservoir and correlated with core samples of the reservoir. Analogue studies enable the determination and correlation of facies-related rock properties to identify sedimentary, diagenetic, and structural variations, allowing for more reliable reservoir property prediction.Rock samples were taken from several outcrops of Upper Devonian carbonates in the Rocky Mountain Front Ranges and from four drill cores from the stratigraphically equivalent Leduc Formation and three drill cores of the slightly younger Nisku Formation in the subsurface of the Alberta Basin. The samples were analyzed for several thermophysical and petrophysical properties, i.e., thermal conductivity, thermal diffusivity, and heat capacity, as well as density, porosity, and permeability. Furthermore, open-file petrophysical core data retrieved from the AccuMap database were used for correlation.The results from both carbonate complexes indicate good reservoir conditions regarding geothermal utilization with an average reservoir porosity of about 8 %, average reservoir permeability between 10−12 and 10−15 m2, and relatively high thermal conductivities ranging from 3 to 5 W m−1 K−1. The most promising target reservoirs for hydrothermal utilisation are the completely dolomitized reef sections. The measured rock properties of the Leduc Formation in the subsurface show no significant differences between the Rimbey-Meadowbrook Reef Trend and the Southesk-Cairn Carbonate Complex. Differences between the dolomitized reef sections of the examined Leduc and Nisku Formation are also minor to insignificant, whereas the deeper basinal facies of the Nisku Formation differs significantly.In contrast, the outcrop analogue samples have lower porosity and permeability, likely caused by low-grade metamorphism and deformation during the Laramide orogeny that formed the Rocky Mountains. As such, the outcrop analogues are not valid proxies for the buried reservoirs in the Alberta Basin.Taken together, all available data suggest that dolomitization enhanced the geothermal properties, but depositional patterns and other diagenetic events, e.g., fracturing, also played an important role.

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“…Unconventional geothermal systems like EGS or high temperature geothermal systems (> 350 • C) have the worldwide largest potential for deep geothermal energy utilization (Huenges, 2010) and have raised the interest of the industry and scientific community in the last decades. Several issues like corrosion and scaling effects have been encountered in the past while trying to exploit and operate unconventional or hot geothermal reservoirs with supercritical conditions (Reinsch et al, 2017). Comprehensive and detailed exploration is needed to improve reservoir understanding and to enable a better reservoir modelling, which helps to handle the supercritical fluid conditions in the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Outcrop analogue study to determine reservoir properties of the Los Humeros and Acoculco geothermal fields, Mexico

et al. 2018

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Abstract. The Los Humeros geothermal system is steam dominated and currently under exploration with 65 wells (23 producing). Having temperatures above 380 ∘C, the system is characterized as a super hot geothermal system (SHGS). The development of such systems is still challenging due to the high temperatures and aggressive reservoir fluids which lead to corrosion and scaling problems. The geothermal system in Acoculco (Puebla, Mexico; so far only explored via two exploration wells) is characterized by temperatures of approximately 300 ∘C at a depth of about 2 km. In both wells no geothermal fluids were found, even though a well-developed fracture network exists. Therefore, it is planned to develop an enhanced geothermal system (EGS). For better reservoir understanding and prospective modeling, extensive geological, geochemical, geophysical and technical investigations are performed within the scope of the GEMex project. Outcrop analogue studies have been carried out in order to identify the main fracture pattern, geometry and distribution of geological units in the area and to characterize all key units from the basement to the cap rock regarding petro- and thermo-physical rock properties and mineralogy. Ongoing investigations aim to identify geological and structural heterogeneities on different scales to enable a more reliable prediction of reservoir properties. Beside geological investigations, physical properties of the reservoir fluids are determined to improve the understanding of the hydrochemical processes in the reservoir and the fluid-rock interactions, which affect the reservoir rock properties.

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ISRM Suggested Methods for Determining Thermal Properties of Rocks from Laboratory Tests at Atmospheric Pressure

Cited by 117 publications

References 28 publications

Thermal Conductivity of Frozen Sediments Containing Self-Preserved Pore Gas Hydrates at Atmospheric Pressure: An Experimental Study

Thermal Conductivity of Frozen Sediments Containing Self-Preserved Pore Gas Hydrates at Atmospheric Pressure: An Experimental Study

From oil field to geothermal reservoir: assessment for geothermal utilization of two regionally extensive Devonian carbonate aquifers in Alberta, Canada

Outcrop analogue study to determine reservoir properties of the Los Humeros and Acoculco geothermal fields, Mexico

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