Iranian Journal of Geophysics

Iranian Journal of Geophysics

Identification of subsurface structures and potential reservoir zones of geothermal filds based on gravitr data analysis in the Karaha-Cakrana area, west Java

Document Type : Research Article

Authors
Salma Azmi Nabila Rahman 1
Agustya Adi Martha 2
Sutrisno Sutrisno 3
Amara Wulandari 4
Nurul Hudayat 5
1 B.Sc., Physics Study Program, State Islamic University Syarif Hidayatullah Jakarta, Jakarta, Indonesia
2 Assistant Professor, Research Center for Geospatial - National Research and Innovation Agency, Bogor, Indonesia
3 Assistant Professor, Physics Study Program, State Islamic University Syarif Hidayatullah Jakarta, Jakarta, Indonesia
4 B.Sc., Pro-Tech Engineering Corporation, Cibinong, Bogor Regency, Indonesia
5 M.Sc., Research Center for Geospatial - National Research and Innovation Agency, Bogor, Indonesia
10.30499/ijg.2024.434652.1563
Abstract
The Karaha-Cakrabuana area in West Java is believed to contain geothermal prospects. The discovery of geothermal manifestations in the form of fumaroles and hot springs requires further development for optimal utilization. This research aims to identify subsurface structures and potential reservoir zones using gravity methods. The research data consist of GGMplus satellite gravity data, processed using Geosoft Oasis Montaj software, and modeled using ZondGM2D. The results of the Second Vertical Derivative (SVD) curve analysis indicate the possibility of both thrust and normal faults. The SVD graph analysis reveals the presence of eleven fault structures, including eight assumed variations of uplift fault structures and three variations of normal fault structures. Faults are believed to exist in specific locations in the foothill region of Mount Talaga Bodas, in the vicinity of Mount Talaga Bodas, at the base of Mount Sawal, and in the area of Karaha Crater. The 2D inversion modeling results identify rocks based on density distribution patterns, namely densities of 1.027 gr/cm3 - 1.6 gr/cm3 and densities between -2.06 gr/cm3 - 1.32 gr/cm3, suggesting tuff and lahar rocks. Densities of 1.68 gr/cm3 - 2.01 gr/cm3 and 1.8 gr/cm3 - 3.74 gr/cm3 suggest breccia and tuff rocks. Densities of 2.09 gr/cm3 - 2.18 gr/cm3 and 4.22 gr/cm3 - 4.7 gr/cm3 are indicative of andesite lava.
Keywords
GGMplus
Karaha-Cakrabuana
Gravity Method
Geothermal
Subsurface Structure
Reservoir Zone

Subjects

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Iranian Journal of Geophysics
Volume 19, Issue 3
July and August 2025
Pages 63-76