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All Journal Jurnal Sosial dan Sains Scientific Contributions Oil and Gas
Wibowo, Ricky Adi
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Astronomy Chemical Engineering, Chemistry & Bioengineering Energy Environmental Science Law, Crime, Criminology & Criminal Justice Library & Information Science Physics

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Identifikasi Awal Keberadaan Batugamping di Cekungan Jawa Timur Utara Bagian Barat Menggunakan Metode Inversi Gravitasi 3D Herlambang, Kevin Adhiatha; Haris, Abdul; Wibowo, Ricky Adi
Jurnal sosial dan sains Vol. 5 No. 5 (2025): Jurnal Sosial dan Sains
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jurnalsosains.v5i5.32197

Abstract

Bagian barat Cekungan Jawa Timur Utara merupakan wilayah prospek hidrokarbon yang menghadapi tantangan eksplorasi akibat gangguan produk vulkanik Plio-Pleistosen pada pencitraan seismik. Untuk mengatasi kendala ini, penelitian ini menerapkan metode gravitasi berbasis data satelit GGMplus sebagai pendekatan pendahuluan yang efektif, sehingga dapat dilakukan identifikasi struktur bawah permukaan dan sebaran reservoir batugamping. Metode yang diterapkan meliputi pembuatan peta Complete Bouguer Anomaly, pemisahan anomali regional-residual melalui metode Spectrum Analysis, dan pemodelan 3D menggunakan metode Inversi Occam. Hasil penelitian mengungkapkan bahwa terdapat tiga zona anomali gravitasi (-55 hingga 55 mGal) yang berkorelasi dengan variasi litologi dan struktur geologi bawah permukaan. Metode Spectrum Analysis telah mengidentifikasi batas kedalaman regional sedalam 6,336 km dan residual sedalam 0,285 km. Pemodelan inversi 3D berhasil mengidenfitikasi sebaran batugamping (berdensitas 1,93-2,9 g/cm³) dengan volume ≤49.689,05 km³. Temuan ini memberikan dasar penting untuk tahap eksplorasi lanjutan dengan metode yang lebih detail seperti survei seismik dan pemboran.
Reservoir Characterization of the Terumbu and Arang Formations Using Model-Based Seismic Inversion in the East Natuna Basin Adham Syahputra, Guntur; Haris, Abdul; Wibowo, Ricky Adi; Wijanarko, Edy
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.1979

Abstract

The Miocene carbonate buildup and fine-grained clastic sequence constitute the main reservoir and sealing intervals in the East Natuna Basin. This study characterizes the reservoirs of the Terumbu and Arang Formations using an integrated workflow that includes petrophysical analysis, sensitivity analysis, depth structure mapping, and model-based seismic inversion. Well-log interpretation shows clear lithological contrasts between the two formations. The Terumbu carbonates exhibit very low gamma-ray values (18 to 24 API) and high porosity, ranging from 28 to 37%, with neutron–density crossovers indicating gas-bearing intervals, particularly in the GADO-3 well, where resistivity values range from 852 to 1958 Ω·m. In contrast, the Arang Formation is characterized by high gamma-ray values (102 to 148 API), higher clay volume (30 to 44%), and low porosity (<10%). P-impedance–density cross-plots distinguish carbonate rocks (4,500 to 10,000 g/cc·m/s; 1.7 to 2.35 g/cc) from shale and shaly sand with higher impedance and density. Depth structure mapping reveals a central–northern structural high that is favorable for reef development and fault-related trapping. Model-based seismic inversion further reveals low-to-moderate impedance (4,100 to 6,156 g/cc·m/s), low density, and high inverted porosity within the Top Terumbu interval, indicating excellent reservoir quality. Overall, the results indicate that the Terumbu Formation forms the primary carbonate reservoir, while the Arang Formation mainly acts as an effective regional seal in the petroleum system of the East Natuna Basin
Co-Authors Abdul Haris Adham Syahputra, Guntur Herlambang, Kevin Adhiatha Wijanarko, Edy