ANALISIS DERIVATIF DAN PEMODELAN 2,5D DATA GRAVITASI UNTUK MENGANALISIS STRUKTUR BAWAH PERMUKAAN LAPANGAN EKSPLORASI NORTHERN VALE YANG DIKELOLA OLEH PT. GEO DIPA ENERGI (PERSERO)

MUTORIZ, ISMAIL (2024) ANALISIS DERIVATIF DAN PEMODELAN 2,5D DATA GRAVITASI UNTUK MENGANALISIS STRUKTUR BAWAH PERMUKAAN LAPANGAN EKSPLORASI NORTHERN VALE YANG DIKELOLA OLEH PT. GEO DIPA ENERGI (PERSERO). Other thesis, UPN Veteran Yogyakarta.

[thumbnail of ABSTRAK_115200003_ISMAIL MUTORIZ.pdf] Text
ABSTRAK_115200003_ISMAIL MUTORIZ.pdf
Download (142kB)
[thumbnail of COVER_115200003_ISMAIL MUTORIZ.pdf] Text
COVER_115200003_ISMAIL MUTORIZ.pdf
Download (133kB)
[thumbnail of DAFTAR ISI_115200003_ISMAIL MUTORIZ.pdf] Text
DAFTAR ISI_115200003_ISMAIL MUTORIZ.pdf
Download (120kB)
[thumbnail of DAFTAR PUSTAKA_115200003_ISMAIL MUTORIZ.pdf] Text
DAFTAR PUSTAKA_115200003_ISMAIL MUTORIZ.pdf
Download (156kB)
[thumbnail of LEMBAR PENGESAHAN_115200003_ISMAIL MUTORIZ.pdf] Text
LEMBAR PENGESAHAN_115200003_ISMAIL MUTORIZ.pdf
Download (327kB)
[thumbnail of SKRIPSI FULLTEXT_115200003_ISMAIL MUTORIZ.pdf] Text
SKRIPSI FULLTEXT_115200003_ISMAIL MUTORIZ.pdf
Restricted to Repository staff only
Download (10MB)

Abstract

vi
ABSTRAK
ANALISIS DERIVATIF DAN PEMODELAN 2,5D DATA
GRAVITASI UNTUK MENGANALISIS STRUKTUR BAWAH
PERMUKAAN LAPANGAN EKSPLORASI NORTHERN VALE
YANG DIKELOLA OLEH PT. GEO DIPA ENERGI (PERSERO)
Oleh:
ISMAIL MUTORIZ
115.200.003
Potensi panas bumi Indonesia sekitar 23,9 Gw, tapi baru dimanfaatkan sekitar 12,5%
atau 3,00 Gw. Oleh Karena itu perlu adanya kegiatan eksplorasi untuk memaksimalkan
potensi panas bumi di Indonesia. Penelitian dilakukan di lapangan eksplorasi milik PT. Geo
Dipa Energi (Persero) tepatnya pada lapangan Northern Vale yang termasuk ke dalam
sistem panas bumi Vulkanik Kuarter. Studi awal dalam tahap eksplorasi panas bumi yaitu
dengan mengidentifikasi kompleksitas struktur geologi menggunakan metode gravitasi
berupa struktur patahan yang mengontrol sistem panas bumi Northern Vale dimana struktur
patahan berperan sebagai jalur keluar masuknya fluida dan struktur intrusi batuan yang
diperkirakan merupakan sumber panas daerah penelitian. Metode gravitasi yang didasarkan
pada parameter fisis densitas batuan di bawah permukaan.
Akuisisi metode gravitasi dilakukan menggunakan instrumen Scintrex-CG 05
sebanyak 300 titik pengukuran dengan densitas rata – rata 2,84 g/cc dari Metode Parasnis.
Pengolahan metode gravitasi dilakukan dari koreksi metode gravitasi, analisis spektrum
metode Radial Average Power Spectrum (RAPS), pemisahan anomali menggunakan filter
Bandpass dengan cut-off wavelength 11800 – 2000, penajaman anomali menggunakan
filter Total Horizontal Derivative (THD), dan Tilt Derivative (TDR) serta membuat
forward modeling 2,5D yang dilakukan pada anomali lokal. Daerah penelitian memiliki
nilai anomali bouguer dalam rentang -3,2 – 45,3 mGal yang tersusun atas batuan vulkanik
produk erupsi gunung di sekitar daerah penelitian.
Berdasarkan hasil interpretasi pada anomali lokal dan penajaman anomali filter THD
dan TDR diketahui bahwasannya pola kelurusan struktur patahan pada daerah penelitian
memiliki orientasi tenggara – barat laut, dan barat daya – timur laut struktur patahan diduga
sebagai jalur recharge area sistem panas bumi Northern Vale dan juga sebagai jalur
keluarnya fluida hidrothermal menuju ke permukaan dan membentuk manifestasi Candi
Umbul, Pakis Dadu dan Candi Dukuh. Serta terdapat struktur intrusi batuan pada daerah
Depresi Suropati dan Gunung Telomoyo yang diduga merupakan sumber panas sistem
panas bumi Northern Vale. Hasil interpretasi tersebut kemudian dilakukan forward
modeling 2,5D daerah Northern Vale.
Kata Kunci: Metode Gravitasi, Northern Vale, Panas Bumi, Struktur, Pemodelan 2,5D
vii
ABSTRACT
DERIVATIVE ANALYSIS AND 2.5D MODELING OF GRAVITY
DATA TO ANALYZE THE SUBSURFACE STRUCTURE IN
NORTHERN VALE EXPLORATION FIELD OWNED BY PT. GEO
DIPA ENERGI (PERSERO)
By:
ISMAIL MUTORIZ
115.200.003
The geothermal potential in Indonesia is approximately 23.9 GW, but only about
12.5% (or 3.00 GW) is currently utilized. Therefore, exploration activities are necessary
to maximize Indonesia’s geothermal potential. Research is conducted in the exploration
field owned by PT. Geo Dipa Energi (Persero), specifically at the Northern Vale field,
which is part of the Quaternary Volcanic geothermal system. The initial study in the
geothermal exploration phase involves identifying the geological structure’s complexity
using gravity methods. These methods focus on fault structures that control the Northern
Vale geothermal system, where fault structures serve as pathways for fluid movement, and
intrusive rock structures are believed to be the heat source in the research area. The gravity
method relies on physical parameters related to rock density beneath the surface.
The gravity method acquisition was carried out using the Scintrex-CG 05 instrument
at 300 measurement points, with an average density of 2.84 g/cc, following the Parasnis
method. The processing of the gravitational method involved correcting the gravitational
data, analyzing the Radial Average Power Spectrum (RAPS) spectrum, separating
anomalies using a Bandpass filter with a cut-off wavelength of 11800 – 2000, enhancing
anomalies using the Total Horizontal Derivative (THD) filter, and Tilt Derivative (TDR),
as well as creating 2,5D forward modeling for the local anomalies. The research area
exhibits Bouguer anomalies ranging from -3.2 to 45.3 mGal, which are associated with
volcanic rock products from nearby mountain eruptions.
Based on the interpretation results of the local anomalies and the enhancement of
anomalies using the THD (Total Horizontal Derivative) and TDR (Tilt Derivative) filters,
it is known that the fault structure alignment pattern in the research area has a southeast
– northwest orientation and a southwest – northeast orientation. The fault structures are
suspected to be the recharge pathways for the Northern Vale geothermal system and also
serve as conduits for hydrothermal fluids to reach the surface, forming manifestations such
as Candi Umbul, Pakis Dadu, and Candi Dukuh. Additionally, there is an intrusive rock
structure in the Depresi Suropati and Mount Telomoyo area, which is believed to be the
heat source for the Northern Vale geothermal system. Following this interpretation, a 2,5D
forward modeling was conducted for the Northern Vale region.
Keywords: Forward Modeling 2,5D, Gravity Method, Geothermal, Structure, Northern
Vale

Item Type: Thesis (Other)
Uncontrolled Keywords: Forward Modeling 2,5D, Gravity Method, Geothermal, Structure, Northern Vale
Subjects: Q Science > QE Geology
Divisions: Faculty of Engineering, Science and Mathematics > School of Geography
Depositing User: Eko Yuli
Date Deposited: 11 Jun 2024 06:38
Last Modified: 11 Jun 2024 06:38
URI: http://eprints.upnyk.ac.id/id/eprint/39735

Actions (login required)

View Item View Item