Ramadhani, Yuniar (2025) Perhitungan Sumberdaya Hidrokarbon Berdasarkan Analisis Petrofisika Pada Struktur Undeveloped Lapangan “Brekele”, Formasi Talang Akar, Cekungan Offshore Jawa Barat Utara. Diploma thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Cekungan Offshore Jawa Barat Utara merupakan salah satu cekungan penghasil hidrokarbon utama di Indonesia dengan keberadaan sejumlah lapangan produksi aktif yang dikelola oleh PT Pertamina Eksplorasi & Produksi (PEP) Regional 2 dan PT Pertamina Hulu Energi Offshore North-West Java (PHE ONWJ). Penelitian ini bertujuan untuk mengidentifikasi potensi hidrokarbon yang bernilai ekonomis pada undeveloped structure di Lapangan “Brekele” pada Formasi Talang Akar, yang merupakan salah satu interval reservoar utama di Cekungan Offshore Jawa Barat Utara. Formasi ini tersusun atas batuan sedimen silisiklastik dengan karakteristik porositas yang baik. Metode yang digunakan dalam penelitian ini meliputi analisis petrofisika secara deterministik pada lima sumur untuk menghitung parameter petrofisika, menentukan ketebalan bersih (net-pay), serta menghitung sumberdaya hidrokarbon secara volumetrik menggunakan simulasi probabilistik Monte Carlo. Hasil penelitian menunjukkan bahwa nilai porositas efektif 19.8%–29.6%, volume shale 2%–32.2%, saturasi air 25.9%–64%, dan permeabilitas yang tergolong excellent menurut Koesoemadinata (1980), mencerminkan kualitas reservoar yang sangat baik. Ketebalan net-pay bervariasi antara 6.5–37 ft, mencerminkan distribusi reservoar yang tidak merata akibat pengaruh sedimentasi transgresif dari utara (depocenter) ke selatan (tinggian). Struktur AS didominasi oleh minyak dengan oil in-place sebesar 27.6 MMBO dan recoverable resource 3.6 MMBO, sementara Struktur CS didominasi gas dengan gas in-place 1.5 BCF dan recoverable resource 1.1 BCF.
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The Offshore North-West Java Basin constitutes one of Indonesia’s primary hydrocarbon-producing regions, hosting numerous active production fields managed by PTmPertamina EP Regional 2 and PT Pertamina Hulu Energi Offshore North-West Java (PHEmONWJ). This study aims to estimate the hydrocarbon resource potential of an undeveloped structure within the “Brekele” Field, focusing on the Talang Akar Formation, a major siliciclastic reservoir interval in the basin. The methodology involves deterministic petrophysical analysis on five wells to assess petrophysical parameters, calculate net-pay thickness, and estimate hydrocarbon resources using Monte Carlo probabilistic simulation. The
results indicate effective porosity values ranging from 19.8% to 29.6%, shale volume from 2%
to 32.2%, water saturation between 25.9% and 64%, and permeability classified as excellent according to Koesoemadinata (1980), all of which reflect favorable reservoir quality. Net-pay thickness varies from 6.5 to 37 ft, indicating heterogeneous reservoir distribution associated with transgressive sedimentation patterns progressing from the northern depocenter toward the
southern structural high. The AS structure is predominantly oil-bearing, with estimated oil inplace of 27.6 million barrels (MMBO) and recoverable resources of 3.6 MMBO. In contrast, the CS structure is gas-dominated, containing 1.5 billion cubic feet (BCF) of gas in-place and 1.1 BCF of recoverable gas resources.
| Item Type: | Thesis (Diploma) |
|---|---|
| Uncontrolled Keywords: | Analisis Petrofisika, Cekungan Offshore Jawa Barat Utara, Formasi Talang Akar, Struktur Undeveloped, Sumberdaya Hidrokarbon, Petrophysical Analysis, Hydrocarbon Resources, Offshore Northwest Java Basin, Talang Akar Formation, Undeveloped Structure. |
| Subjects: | Q Science Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Yuniar Ramadhani |
| Date Deposited: | 29 Jul 2025 10:07 |
| Last Modified: | 29 Jul 2025 10:07 |
| URI: | http://repository.its.ac.id/id/eprint/122867 |
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