Integrated geophysical and geological methods to identify structure existence as a permeable zone in a geothermal field

Hanifah Ainul Azkia, Yunus Daud

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

At the development stage of a geothermal field, a comprehensive survey is needed to obtain an accurate picture of the geothermal system to identify the subsurface condition on the prospect field. The geological structure is one of the important aspects of geothermal exploration. It creates permeability, which allows geothermal fluids to flow to the surface. Locating geological structures in the prospect area will be a powerful tool to determine the drilling target for exploration or production wells. One of the methods to identify geological structure on the surface is using satellite imagery. It is based on visual interpretation of the morpho-structural aspect combined with the lithological aspect and then confirmed with field data. The remote sensing data is built from DEMNAS data and a regional geological map. DEMNAS has spatial resolution 0,27-arcsecond, vertical datum EGM2008. While the subsurface geological structure can be identified by using the Gravity Second Vertical Derivative (SVD) and First Horizontal Derivative (FHD) method. Gravity method identifies structure by slicing the SVD grid, which has suspected structure and then confirmed with FHD slicing in the same suspected area. The geological structure will be confirmed if the value of FHD maximum and SVD value 0. The results of the data processing above are then integrated to obtain the distribution of geological structures as a permeable zone in the geothermal field which then can be used as a guide in determining the location of exploration and production wells.

Original languageEnglish
Title of host publication9th National Physics Seminar 2020
EditorsHadi Nasbey, Riser Fahdiran, Widyaningrum Indrasari, Esmar Budi, Fauzi Bakri, Teguh Budi Prayitno, Dewi Muliyati
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440647
DOIs
Publication statusPublished - 2 Mar 2021
Event9th National Physics Seminar 2020 - Jakarta, Virtual, Indonesia
Duration: 20 Jun 2020 → …

Publication series

NameAIP Conference Proceedings
Volume2320
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference9th National Physics Seminar 2020
CountryIndonesia
CityJakarta, Virtual
Period20/06/20 → …

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