ANALOG SINGKAPAN UNTUK STUDI FASIES DAN POTENSI BATUAN RESERVOIR PADA KOMPLEK NGORO – ORO

RIFASYA, RYAN EZRA (2025) ANALOG SINGKAPAN UNTUK STUDI FASIES DAN POTENSI BATUAN RESERVOIR PADA KOMPLEK NGORO – ORO. Skripsi thesis, UPN Veteran Yogyakarta.

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Abstract

SARI
ANALOG SINGKAPAN UNTUK STUDI FASIES DAN
POTENSI BATUAN RESERVOIR PADA KOMPLEK NGORO –
ORO
Oleh
Ryan Ezra Rifasya
111.210.111
Program Studi Sarjana Teknik Geologi
Reservoir laut dalam merupakan target eksplorasi hidrokarbon yang
signifikan terutama pada endapan turbidit vulkanilkastik yang merupakan salah satu
jenis reservoir laut dalam yang menjadi daya tarik penelitian ini. Studi analog
singkapan pada Formasi Semilir bertujuan sebagai langkah awal dalam eksplorasi
sebagai petunjuk agar mengurangi ketidakpastian data bawah permukaan.
Metodologi meliputi akuisisi data lapangan (foto, model digital outcrop, profil,
measuring section) dan analisis laboratorium sampel batuan (mikrofosil, petrografi,
kalsimetri, serta properti reservoir). Pengamatan stratigrafi pada daerah penelitian
terdiri dari 5 titik lokasi pengamatan dengan total tebal 131,088 meter yang tersusun
oleh satuan Batupasir Tufan Semilir. Terdapat variasi litologi perselingan batupasir
tufan dan batulanau, batupasir kerakalan, batupasir tufan, dan breksi pumis. Fasies
utama yang teridentifikasi adalah Classical Turbidite (67%) 87,6921 meter, diikuti
Conglomerate (14%) 18,621 meter, Pebbly Sandstone (13%) 16,367 meter, dan
Massive Sandstone (6%) 8,4073 meter. Berdasarkan asosiasi fasies nya Satuan
batupasir tufan yang menempati pada Formasi Semilir diendapkan pada lingkungan
laut dalam tepatnya upper fan – middle fan (smooth portion of suprafan lobes) pada
ke dalaman batial bawah saat kala Miosen Awal-Miosen Tengah (N7-N10).
Analisis properti reservoir menunjukkan Formasi Semilir memiliki potensi yang
menjanjikan. Nilai porositas efektif berkisar antara 10,2501% hingga 24,9082%
(kategori cukup hingga sangat baik), sedangkan porositas total (analisis blue dyed)
antara 10,18% hingga 31,75% (kategori cukup hingga sangat baik). Nilai
permeabilitas berkisar dari 5,97481 mD hingga 807,589 mD (kategori cukup hingga
baik sekali), fasies dengan nilai properti reservoir yang baik berada pada fasies
Conglomerate diendapkan pada upper fan dan fasies Pebbly Sandstone, Massive
Sandstone diendapkan pada channeled portion suprafan lobes pada middle fan.
Selain fakton syn-depositional terdapat pendukung pelarutan dan rekahan yang
mendukung properti reservoir. Formasi Semilir di Ngoro-Oro berpotensi sebagai
batuan reservoir didasarkan pada litofasies batupasir tufan dan properti fisik yang
mendukung. Studi analog ini dapat menjadi acuan pemodelan geologi dan reservoir
pada cekungan vulkaniklastik serupa.
Kata Kunci: Analog Singkapan, Fasies, Batuan Reservoir, Semilir.
vi
ABSTRACT
OUTCROP ANALOG FOR FACIES AND RESERVOIR ROCK
POTENTIAL STUDY IN THE NGORO-ORO COMPLEX
By
Ryan Ezra Rifasya
111.210.111
Undergraduate Study Program in Geological Engineering
Deep-sea reservoirs are significant hydrocarbon exploration targets, particularly
volcaniclastic turbidite deposits, which are a focus of this research. This outcrop
analog study of the Semilir Formation serves as an initial step in exploration,
providing guidance to reduce subsurface data uncertainties. The methodology
involved field data acquisition (photos, digital outcrop models, profiles, measuring
sections) and laboratory analysis of rock samples (microfossils, petrography,
calcimetry, and reservoir properties). Stratigraphic observations at the study area
were conducted at 5 observation points, with a total thickness of 131.088 meters,
composed of the Semilir Tuffaceous Sandstone unit. Lithological variations include
interbedded tuffaceous sandstone and siltstone, pebbly sandstone, tuffaceous
sandstone, and pumice breccia. The main identified facies are Classical Turbidite
(67%, 87.6921 meters), followed by Conglomerate (14%, 18.621 meters), Pebbly
Sandstone (13%, 16.367 meters), and Massive Sandstone (6%, 8.4073 meters).
Based on their facies associations, the tuffaceous sandstone unit within the Semilir
Formation was deposited in a deep-sea environment, specifically the upper fan to
middle fan (smooth portion of suprafan lobes), at lower bathyal depths during the
Early to Middle Miocene (N7-N10). Analysis of reservoir properties indicates that
the Semilir Formation has promising potential. Effective porosity values range from
10.2501% to 24.9082% (fair to excellent category), while total porosity (blue-dyed
analysis) ranges from 10.18% to 31.75% (fair to excellent category). Permeability
values range from 5.97481 mD to 807.589 mD (fair to excellent category). Facies
with good reservoir properties are found in the Conglomerate facies, deposited in
the upper fan, and the Pebbly Sandstone and Massive Sandstone facies, deposited
in the channeled portion of suprafan lobes in the middle fan. In addition to syn
depositional factors, dissolution and fracturing also contribute to the favorable
reservoir properties. The Semilir Formation in Ngoro-Oro has potential as a
reservoir rock based on its tuffaceous sandstone lithofacies and supporting physical
properties. This analog study can serve as a reference for geological and reservoir
modeling in similar volcaniclastic basins.
Keywords: Outcrop Analog, Facies, Reservoir Rock, Semilir.
vii

Item Type:	Tugas Akhir (Skripsi)
Uncontrolled Keywords:	Analog Singkapan, Fasies, Batuan Reservoir, Semilir.
Subjek:	Q Science > QE Geology
Divisions:	Fakultas Teknologi Mineral dan Energi > (S1) Teknik Geologi
Depositing User:	Eko Yuli
Date Deposited:	27 Nov 2025 03:28
Last Modified:	27 Nov 2025 03:28
URI:	http://eprints.upnyk.ac.id/id/eprint/45871

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