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All Journal Petro : Jurnal Ilmiah Teknik Perminyakan Scientific Contribution Oil and Gas
Widi Atmoko
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science

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EVALUASI PROPERTI RESERVOIR MENGGUNAKAN ANALISIS PETROFISIKA PADA FORMASI GABUS, CEKUNGAN NATUNA BARAT, LAPANGAN “LEUSER” Rian Cahya Rohmana; Al Zam Zam; Widi Atmoko; Mahdani Mahardika Sastra; Rezandy Purnomo Setyo
PETRO:Jurnal Ilmiah Teknik Perminyakan Vol. 11 No. 3 (2022): SEPTEMBER
Publisher : Jurusan Teknik Perminyakan Fakultas Teknologi Kebumian dan Energi Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/petro.v11i`3.15244

Abstract

Formasi Gabus merupakan salah satu formasi dengan litologi batupasir dari Cekungan Natuna Barat yang memiliki prospek hidrokarbon. Penelitian ini berlokasi di Lapangan “Leuser”, Cekungan Natuna Barat. Tujuan penelitian ini adalah mencari zona potensial hidrokarbon baru dan mengevaluasi properti batuan meliputi volume shale, porositas, permeabilitas, dan saturasi air. penelitian ini menggunakan 7 data well log serta didukung oleh data mudlog, analisis core, dan drill stem test. Data tersebut di interpretasi untuk mencari zona potensial hidrokarbon. Setelah itu, dilakukan analisis petrofisika pada setiap sumur untuk mengetahui properti batuan pada zona potensial. Berdasarkan hasil interpretasi, ditemukan 25 zona potensial hidrokarbon di ketujuh sumur penelitian ini, dengan zona potensial terbanyak (7 zona) terdapat di sumur AZZ-5. Berdasarkan hasil analisis petrofisika pada setiap zona potensial yang ditemukan di 7 sumur, didapatkan nilai volume lempung rata – rata berkisar antara 8.52% - 28.32%, nilai porositas efektif rata – rata berkisar antara 12.44% - 21.74%, nilai permeabilitas rata - rata berkisar antara 18.12 mD - 824.64 mD. Klasifikasi nilai porositas efektif yang didapatkan berkisar antara cukup – sangat baik, sedangkan klasifikasi nilai permeabilitas berkisar antara cukup – baik sekali. Untuk melihat kejenuhan fluida pada zona potensial, dilakukan perhitungan saturasi air dan didapatkan nilai saturasi air rata – rata berkisar antara 56.97% - 64.15%. Hasil interpretasi dan analisis pada penelitian ini dapat menjadi dasar untuk terus melakukan eksplorasi, khususnya pada daerah penelitian karena masih terdapat hidrokarbon di dalam batuan yang memiliki properti yang baik, terutama porositas dan permeabilitas.
The Comparation of Water Saturation Approaches to Reveal a Low Resistivity Reservoir Potential Case in Gumai Formation, South Sumatra Basin Dhea Adisty Pratami; Sarju Winardi; Sugeng Sapto Surjono; Widi Atmoko
Scientific Contributions Oil and Gas Vol. 46 No. 2 (2023): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.46.2.322

Abstract

The LRLC reservoir zone has been identified in SN-3 well, at the DAP-1 interval on Gumai Formation. This interval has a low resistivity value from 3-5 ohm.m and the drill stem test (DST) results show oil with gas without water. This study is objected to identify the causes of LRLC reservoir in gumai formation and finding a suitable sw calculation method. Some data such as well logs, reports, cores, and XRD are used to calculate petrophysical parameters such as Vsh, Phie, and Sw, and would be validated by DST data. Water saturation (Sw) calculations from Archie and the CEC method (Waxman Smits, Dual Water, Juhasz) were performed and the results were compared. The results showed that the main cause of the DAP-1 interval LRLC zone was the presence of clay minerals consisting of mixed layers (Illite/smectite). These clay minerals will be associated with high cation exchange capacity (CEC) values, with the value 70 (meq/100g), which can increase conductivity and reduce resistivity values. Based on lumping the more optimistic results of sw calculation from Waxman Smits Sw method (Sw based on CEC method). The DST data on the SN-3 well does not have water test data, so the calculation of the Sw value that is close to the Swirr value is considered the most suitable Sw for the low resistivity reservoir conditions of the Gumai Formation in the study area. The best practice for low resistivity reservoir for suitable petrophysical calculation is necessary to pay attention to the rock lithology conditions, the presence of mineral clay, and determining suitable Sw appropriate to the reservoir conditions
Uncovering The Potential of Low Resistivity Reservoirs Through Integrated Analysis: A Case Study from The Talang Akar Formation in The South Sumatra Basin Fiqya Fairuz Zaemi; Rian Cahya Rohmana; Widi Atmoko
Scientific Contributions Oil and Gas Vol. 45 No. 3 (2022): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The study area is an oil and gas field that has a low resistivity reservoir zone in the Talang Akar Formation, South Sumatera Basin. The reservoir zone is composed of siltstone and sandstone that was deposited in a shallow to transitional marine environment. The aim of this study is to identify and determine the potential of low resistivity reservoirs in the study formation. The data used in the study include well log, mud log, core data (porosity, permeability, petrography), formation water analysis, and biostratigraphy. The methodology includes qualitative analysis to determine reservoir potential zones (quick look interpretation) and the reason for low resistivity reservoirs, as well as quantitative analysis to calculate petrophysical parameters. The results of the quick look analysis showed 77 low resistivity reservoir zones, but the petrophysical analysis identified 25 low resistivity reservoir zones as potential candidates for drill steam test (DST). Factors causing low resistivity reservoirs in the study area include clay mineral content (kaolinite and illite), conductive minerals (pyrite and siderite), high salinity formation water (>10,000 ppm), very fine to medium sand grain size (0.063 - 0.5 mm) distribution of clay minerals (laminated and dispersed clay), and thin laminates. The results of the petrophysical analysis show that shale volume is less than 30%, porosity is greater than 14%, permeability is greater than 10 mD, and water saturation is less than 70%.
ANALISIS PENYEBAB RESERVOIR RESISTIVITAS RENDAH PADA LAPISAN BATUPASIR FORMASI TALANG AKAR CEKUNGAN SUNDA ASRI DAN SUMATERA SELATAN Octavia, Dea; Rian Cahya Rohmana; Widi Atmoko
Petro : Jurnal Ilmiah Teknik Perminyakan Vol. 13 No. 2 (2024): Juni 2024
Publisher : Jurusan Teknik Perminyakan Fakultas Teknologi Kebumian dan Energi Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/petro.v13i2.19686

Abstract

This research area is an oil and gas field characterized by low-resistivity zones in the Talang Akar Formation of the Sunda Asri and South Sumatra basins. The formation's lithology comprises sandstone, claystone, shale, and interspersed limestone, all deposited in a shallow marine environment. The objective of conducting petrophysical analysis is to identify the potential of the formation, particularly its low-resistivity reservoirs. The research utilizes well log, core, mud log, petrography, X-ray diffraction (XRD), and biostratigraphy data. Analysis of these data yields Gamma Ray logs, Resistivity logs, and Porosity logs, which include neutron log porosity (NPHI) and density porosity (RHOB). Several factors contribute to the low resistivity of reservoirs in this area, including the presence of clay minerals like kaolinite, chlorite, and illite in the Talang Akar formation, which interfere with low resistivity readings. The occurrence of conductive minerals such as pyrite, biotite, and tourmaline, the high salinity of formation water (>10,000 ppm), classified as High Saline Water, the fine to medium grain size of the sand (0.063 – 0.5 mm) which can retain formation water (irreducible water), leading to low resistivity readings, and the thickness of the rock layers, as evidenced by the depositional environment of the Talang Akar Formation, ranging from the upper delta plains to the lower delta plains, are also influential factors.
Co-Authors Al Zam Zam Dhea Adisty Pratami Fiqya Fairuz Zaemi Mahdani Mahardika Sastra Octavia, Dea Rezandy Purnomo Setyo Rian Cahya Rohmana Rian Cahya Rohmana Sarju Winardi Sugeng Sapto Surjono