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Prediction of Caprock and Structure of Candi Gedongsongo Geothermal System from AMT DataNormal access

Authors: N. Alviandari, F. Sulistyo, A. Suprobo, M. Rizki, B.T. Baihaqi and T.Y. Yudhanto
Event name: EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering
Session: Session 7 : Geothermal
Publication date: 09 April 2018
DOI: 10.3997/2214-4609.201800401
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.12Mb )
Price: € 20

Geophysical investigation with AMT method conducted based on the existence of the surface manifestations on Candi Gedongsongo area and appear to identify the structure of the suspected fault as a weak zone both as recharge area and the emergence of the manifestation zone. This investigation was done on the post volcanic belt of older subduction zone that have significant geothermal gradient by the depth AMT data acquisition was done with Stratagem Unit 26716-01 Rev D by Geometrics that calculate true resistivity with its inversion then modeled on 2D model to identify the fault structure and 3D model to shows the caprock geometry. As a result there are 2 faults shows that has strike and dip of N350oE / 60o that continues from north to south and the second fault shown on P1 but the strike and dip can not be known. The caprock identified on high resistivity value ranges between 1000 -100,000 ohm.m with andesite lithology lying under elevation of 1000 m.

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