Physical Characterization of Rocks in Thung Nui Hot Spring, Satun Province, the South of Thailand
In this study, Physical properties of rocks from geothermal reservoir were investigated. To describe rock properties of the selected outcrops, density, radioactivity, and heat production were researched. The obtained density of granite rock from Triassic period and limestone rock from Ordovician period were 2,648±112 kg/m3 and 2,637±96 kg/m3, respectively. Radioactivity of 226Ra 232Th and 40K of granite rock were measured as 109.9±17.2 Bq/kg, 134.2±9.5 Bq/kg, and 1,569.3±75.7 Bq/kg, respectively. For limestone rock, it shows 13.8±6.4 Bq/kg, 23.3±7.7 Bq/kg, and 394.1±117.8 Bq/kg, respectively. After grinding the samples, radioactivity values of 226Ra, 232Th, and 40K were measured by gamma spectrometer. It was found that the concentration of 238U, 232Th, and 40K in granite rocks from Triassic period were 8.90 ppm, 33.07 ppm, and 5.06%, and limestone rocks from Ordovician period are 1.11 ppm, 5.73 ppm, and 1.27%, respectively. The physical properties of reservoir rocks giving geological parameter information were necessary to understand geothermal system of the area in this study and to develop renewable energy for the community.
P. Khoonphunnarai et al., "Physical Characterization of Rocks in Thung Nui Hot Spring, Satun Province, the South of Thailand", Applied Mechanics and Materials, Vol. 886, pp. 166-171, 2019