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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.
Terumbu and Arang Formation Characterization by 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 become the main reservoir and sealing intervals in the East Natuna Basin. In this geological context, the reservoir characterization of Terumbu and Arang formation was conducted using an integrated methodology that includes petrophysical interpretation, followed by sensitivity analysis, structure depth mapping, and model-based seismic inversion. Well-log analysis reveals distinct lithological contrasts among the two formations. The Terumbu carbonates exhibit very low gamma-ray values (18 24 API) and high porosity ranging by 28 37%, locally reaching 31% in the GANG-4 well. Pronounced neutron density crossovers indicate gas-bearing intervals, particularly at depths of 6,808 6,831 ft and 6,908 6,941 ft in the GADO-3 well, where deep resistivity values increase significantly (852 1958 Ω·m). In contrast, the Arang Formation is characterized by high gamma-ray values (102 148 API), elevated clay volume (30 44%), and substantially lower porosity (<10%). P-impedance density cross-plots show carbonate clusters inside of impedance values of 4,500 10,000 g/cc·m/s and density ranges of 1.7 2.35 g/cc,  whereas shale and shaly sand plot at higher impedance (9000 17,500 g/cc·m/s) and density (2.45 2.80 g/cc). Depth structure mapping identifies a central northern structural high that favors reef development and fault-controlled trapping. Model-based seismic inversion reveals low to medium impedance values (4100 6156 g/cc·m/s), low density (1.57 1.77 g/cc), and high inverted porosity (0.37 0.52, locally up to 0.70) Inside the top Terumbu interval, indicating very good quality of reservoir rock is confirmed by these outcomes. Conversely, the underlying Arang interval becomes tighter and denser by a continued increase in impedance ( by porosity values <11%) and poor reservoir potential.
Co-Authors Abdul Haris Adham Syahputra, Guntur Herlambang, Kevin Adhiatha Wijanarko, Edy