TY - GEN
T1 - The intergrated delineation of geothermal system area 'Z' using 3D inversion of magnetotelluric data and gravity data
AU - Wahyu, S.
AU - Daud, Y.
AU - Rahadinata, T.
AU - Fahmi, F.
AU - Hafidz, M.
N1 - Funding Information:
The authors would like to thank to PT. Newquest Geotechnology, University of Indonesia for the allowance using software such as Static Shifter-X and MT3DInv-X. We also would like to thank to “Pusat Sumber Daya Mineral Batubara dan Panasbumi (PSDMBP) for permitting us doing analysis the data. SW would also like to thank the Indonesia Ministry of Finance through Lembaga Pengelola Dana Pendidikan (LPDP) for the thesis writing scholarship (No: PRJ-747 /LPDP.3/2016).
Publisher Copyright:
© 2018 Author(s).
PY - 2018/10/22
Y1 - 2018/10/22
N2 - A study for delineating geothermal system of prospect area "Z" has been done by using three-dimension modeling of magnetotelluric supported unified data just like geological and geochemical and integrated gravity data. Geothermal area "Z" in tectonic setting included in Sumatra volcanic back-arc, right on one of the southern part of Sumatra fault segment, composes by volcanic and clastic sendimentary rock are Tertiary to Quarternary (Andesite-Basalt). The existance of geothermal system in this area is indicated by the presence of thermal manifestation in form of alteration and five hot springs temperature in the ranges 44.4 - 92.5°C, and pH 8.19 - 9.43 and type of fluid are bicarbonate, sulphate-bicarbonate, and sulfate-chloride. The development of geothermal system is affected by tectonic oblique between the Indian Ocean plate and the Eurasian Continent Plate (direction of the Sumatra fault patterns). Based on the analysis of geothermal water reservoir temperature are taken through the calculation geothermometer SiO2 Fournier, Na-K Giggenbach, Na-K-Ca, Na-K-Mg diagram and Enthalpi Mixing Cloride Model range 145-155°C, classified as intermediate temperature. Based on a three-dimensional inversion of the magnetotelluric data obtained depth Top of Reservoir (TOR) geothermal system area "Z" about 400 m (elevation 50 meters above sea leavel), while based on the two dimensional of the gravity data predicted heat sources such as cooling instrusion (estimated gabbro; density 2.95-3.15 g/cc) and reservoar such as sandstone (resistivity 50-250 Ωm; density 2.60 g/cc). The Geothermal systems of research area classified as the type of intermediate temperature tectonic fracture zone with prospect area about 7.5 km2.
AB - A study for delineating geothermal system of prospect area "Z" has been done by using three-dimension modeling of magnetotelluric supported unified data just like geological and geochemical and integrated gravity data. Geothermal area "Z" in tectonic setting included in Sumatra volcanic back-arc, right on one of the southern part of Sumatra fault segment, composes by volcanic and clastic sendimentary rock are Tertiary to Quarternary (Andesite-Basalt). The existance of geothermal system in this area is indicated by the presence of thermal manifestation in form of alteration and five hot springs temperature in the ranges 44.4 - 92.5°C, and pH 8.19 - 9.43 and type of fluid are bicarbonate, sulphate-bicarbonate, and sulfate-chloride. The development of geothermal system is affected by tectonic oblique between the Indian Ocean plate and the Eurasian Continent Plate (direction of the Sumatra fault patterns). Based on the analysis of geothermal water reservoir temperature are taken through the calculation geothermometer SiO2 Fournier, Na-K Giggenbach, Na-K-Ca, Na-K-Mg diagram and Enthalpi Mixing Cloride Model range 145-155°C, classified as intermediate temperature. Based on a three-dimensional inversion of the magnetotelluric data obtained depth Top of Reservoir (TOR) geothermal system area "Z" about 400 m (elevation 50 meters above sea leavel), while based on the two dimensional of the gravity data predicted heat sources such as cooling instrusion (estimated gabbro; density 2.95-3.15 g/cc) and reservoar such as sandstone (resistivity 50-250 Ωm; density 2.60 g/cc). The Geothermal systems of research area classified as the type of intermediate temperature tectonic fracture zone with prospect area about 7.5 km2.
KW - 3D MT inversion modeling
KW - Prospect zone
KW - forward gravity modeling
KW - geothermal analysis water
KW - geothermal system
UR - http://www.scopus.com/inward/record.url?scp=85056124059&partnerID=8YFLogxK
U2 - 10.1063/1.5064256
DO - 10.1063/1.5064256
M3 - Conference contribution
AN - SCOPUS:85056124059
T3 - AIP Conference Proceedings
BT - Proceedings of the 3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
A2 - Yuniati, Ratna
A2 - Mart, Terry
A2 - Anggraningrum, Ivandini T.
A2 - Triyono, Djoko
A2 - Sugeng, Kiki A.
PB - American Institute of Physics Inc.
T2 - 3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
Y2 - 26 July 2017 through 27 July 2017
ER -