Open AccessThe effect of temperature on 3D rock structure of andesite rock sample from potential geothermal area, Sulawesi-Indonesia
Author(s) -
Mulyana Fitri,
Lilik Hasanah,
Fourier Dzar Eljabbar Latief,
Selly Feranie
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1280/2/022053
Subject(s) - geothermal gradient , andesite , geology , fractal dimension , mineralogy , mineral , volume (thermodynamics) , porosity , sample (material) , materials science , fractal , volcanic rock , geochemistry , geotechnical engineering , volcano , metallurgy , chemistry , geophysics , mathematics , mathematical analysis , physics , quantum mechanics , chromatography
An andesite rock sample was taken from potential geothermal area on Lili-Sepporaki, west Sulawesi. The sample is an impermeable cap rock with a high silica mineral at alteration zone around a manifestation. Its Three-dimensional rock structure was analyzed to see its deformation due to temperature change. Change of temperature from 24˚C to 100˚C, 150˚C, 200˚C, and 250˚C was applied to the sample. Subsequent to each change of temperature, the sample was scanned using a micro-Computed Tomography Scan (μ-CT Scan). From the scanning process, a sub-volume 300 pixels were reconstructed, and its 3D pore and mineral structure were characterized. It is found that porosity {φ (T)}, specific surface area {SsA (T)} decrease polynomial for pore structure and increase polynomial as temperature increases. This result show that as temperature increases the volume of mineral is bigger make the pore volume smaller. The Fractal dimension for pore structure (2.65 ± 0.02) and for mineral structure (2.89 ± 0.015).