3D Geothermal Modelling Using Gravity Survey on Dolok Marawa, Simalungun District, North Sumatera

In North Sumatera, gravity method is applied to identify the geothermal model. This method measured the earth gravitational field. This research has 160 measurement points covering 9 square kilometers. We obtained complete Bouguer anomaly values ranging 85 mGal - 130.68 mGal interpreted as a heat so...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2016-01, Vol.29 (1), p.12011-12015
Main Authors: Rivandi, A, Destawan, R, Fajri, Z R, Hidayat, W
Format: Article
Language:English
Subjects:
Chambers
Density
Earth
Geothermal
Gravitation
Heat sources
Modelling
Three dimensional models
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Summary:In North Sumatera, gravity method is applied to identify the geothermal model. This method measured the earth gravitational field. This research has 160 measurement points covering 9 square kilometers. We obtained complete Bouguer anomaly values ranging 85 mGal - 130.68 mGal interpreted as a heat source of andesitic igneous rocks that are affected by the presence of Mount Bahtopu magma chamber. We interpreted the values between 40 mGal - 80 mGal as reservoir and caprock. The 3D gravity inverse modelling conducted using Gravblox, and identifying the following lithologies; Toba Pyroclastic Fall (Qjt) with density 1.92 g cm3, Toba Pyroclastic Flow (Qjt) with density 2.00 g cm3, Mount Bahtopu Andesite (Qlb) with density 2.4 g cm3, and 2.6 g cm3 which is interpreted as heat source in form of andesitic rock and Mount Bahtopu magma chamber. This heat source is estimated to be at a depth of 1.45 km to 3.78 km below the surface.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/29/1/012011