Thermal conductivity of major rock types in western and central Anatolia regions, Turkey

Abid

Advances in Materials Science and Engineering

et al. 2020

Accurate values of thermal properties of rocks are needed for a number of engineering applications starting from heat losses in buildings to underground geothermal modeling. Igneous rocks are one of the major constituents of the Earth’s crust and are formed by the crystallization and solidification of molten magma. In this work, the thermal transport properties of porous igneous basalt rocks are measured using Transient Plane Source (TPS) technique under ambient conditions with air as saturant in pore spaces. Data are presented for fifteen samples of volcanic basalt rocks having different porosity values ranging from 0.267% to 9.432% by volume, taken from the place of Warsak near Peshawar city, located in the north of Pakistan. The porosity and density parameters are measured using the American Society of Testing and Materials (ASTM) standards. The mineral compositions of the samples are analyzed by X-ray fluorescence (XRF) technique. The specific gravity is predicted using the chemical composition of basalts and is compared with the experimental results. The thermal conductivity and thermal diffusivity values of the measured samples are also predicted using the mixing law and empirical models and results are compared with the measured data. Results show that the thermal conductivity of the studies of basalt samples decreases with the increase in porosity values, whereas no significant change has been observed in the thermal diffusivity data. Measured data are significant for geothermal modeling and in predicting heat losses in buildings wherever basalt rocks are used.

Section: Introductionmentioning

confidence: 99%

Measurement and Prediction of Thermal Conductivity of Volcanic Basalt Rocks from Warsak Area

Abid

Advances in Materials Science and Engineering

et al. 2020

“…The sensitivity of the model overpressure to downward fluid flow into basement rock, was modelled using ranges in pre‐Messinian claystone permeabilities of 10 –17 –10 –22 m 2 at porosities of 2%–14% for a 4,000 m subsurface depth. To ground truth mineral dehydration as an overpressure mechanism in the region, heat flow of 80–120 m W/m 2 (Carballo et al, 2014), thermal conductivities for marlstone of 1.5–3.0 W/m K/m (Erickson & Von Herzen, 1978), thermal conductivities for gypsum of 1.0–1.3 W/m K/m (Balkan et al, 2017; Robertson & Geological Survey (U.S.), 1988), thick basin‐ward units and seabed temperature are used to estimate the thermal structure of the 1D sediment column. Combining these temperature data with pressure data we estimate the P‐T conditions of the Algero‐Balearic Upper Unit Gypsum relative to the boundaries of the dehydration reaction.…”

Section: Modelling Approachmentioning

confidence: 99%

The Messinian Salinity Crisis as a trigger for high pore pressure development in the Western Mediterranean

et al. 2021

“…Available thermal conductivity measurements of surface outcrops were made on wet conditions. If thermal conductivity measurements were not available, literature values from Erkan (2015) and Balkan et al (2017) were used. Menderes graben.…”

Section: Heat Flowmentioning

confidence: 99%

Surface heat flow in Western Anatolia (Turkey) and implications to the thermal structure of the Gediz Graben

Balkan-Pazvantoğlu¹,

Erkan²,

Şalk³

et al. 2021

Turkish J Earth Sci

Self Cite

Knowledge of heat flow density on the Earth's surface and subsurface temperature distribution is essential for the interpretation of several processes in the crust such as for the evaluation of the geothermal potential of a region. With this study, we investigate the conductive heat flow distribution in western Anatolia to understand the thermal state and its relationship to regional tectonics in the region. The new heat flow data are collected and combined with previously published data to obtain the new heat flow map of western Anatolia. Analysis of data sets after appropriate corrections yields a better picture of the regional distribution of heat flow within the region. Generally, high values are observed around the grabens of Menderes Massif due to the intense tectonic activity. We also present the 2D steady-state thermal model of Gediz. The modeled temperatures are validated by temperature measurements from two deep wells. Numerical 2 simulation results show that the dominant heat transfer mechanism in Gediz graben can be explained by conduction. Temperature distribution in the deep subsurface of the graben is controlled by both thickness distribution and thermal properties of the different stratigraphic sections. Thermal conductivity contrast between different stratigraphic sections causes anomalously elevated heat flow values at the edges of the graben. The comprehensive results of this study will bring a new perspective to geothermal studies in particular Enhanced Geothermal Systems (EGS) resource estimations in Gediz graben.