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Lithofacies, Facies Association, and Depositional Environment of 34-1, 33-6, and 33-4 Sandstone, Wida Field, Gita Member, Talang Akar Formation, Asri Basin, Offshore Southeast Sumatra Saputra, Adi Danu; Surjono, Sugeng Sapto; Winardi, Sarju; Setyadi, Abdul Latif; Ralanarko, Dwandari
Jurnal Ilmiah Geologi PANGEA Vol 11, No 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12011

Three Gita Member reservoirs 34-1, 33-6, and 33-4 produce from solution gas drive with rapid pressure decline and low recovery factor. After successful oil production enhancements through waterflooding injections prompt the need for a reservoir model in further field development. Before such models were built reservoir characterization was carried out to determine facies and depositional environment for facies modeling. The study integrated core, wireline log, petrophysical logs, seismic attribute, petrography, etc. Next, well correlation was carried out to distribute stratigraphic markers. Finally, seismic attribute and well correlation were integrated to construct pie chart and depositional environment map. External geometry from seismic attribute revealed distributary channel with point bars which act as reservoir and consist of medium-fine grained planar tabular cross bedding sandstone, mud drapes sandstone, and ripple-wavy lamination sandstone. The wireline log showed fining-upward pattern and core displayed abundant channel rip up clasts, sharp or erosional contact with underlying lithology. Frequent mud drapes found within channel sandstone indicate tidal influence in proximity to marine environment probably in lower delta plain. Channels are trending west-east (34-1) and north-south (33-6 and 33-4). Other facies associations are shallow marine, swamp, interdistributary bay, and tidally influenced interdistributary bay. Shallow marine FA consists of skeletal limestone (Lm), calcareous mudstone, and calcareous sandstone (Sc). Rootlet mudstone (Fb) and interlamination of carbonaceous mudstone with very fine-grain sandstone (Fl) formed interdistributary bay FA. Swamp FA consists of coal and coaly mudstone. Tidally influenced interdistributary bay FA consists of carbonaceous laminated mudstone high in carbon (Flb), intensely bioturbated carbonaceous mudstone (Flb), very finely laminated mudstone-very fine grain sandstone (Fl) and black fissile shale (Fm).

CARBON CAPTURE AND STORAGE (CCS) POTENTIAL AT LOW-RESISTIVITY RESERVOIR USING PETROPHYSICAL ANALYSIS AT "SOKA JINGGA" FIELD, TALANG AKAR FORMATION, ASRI BASIN Yusriyah, Dzakiyah; Syafri, Ildrem; Mohamad, Febriwan; Ralanarko, Dwandari; Aprillia, Belinda Rizka
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.56477

Carbon Capture and Storage (CCS) is a new technology that uses subsurface reservoirs to reduce carbon dioxide emissions by storing it below the surface. PT XYX conducted a comprehensive exploration of the CCS potential in Indonesia. The “Soka Jingga” Field, located at Talang Akar Formation, Asri Basin, is a potential candidate for CCS. The “Soka Jingga” Field has low resistivity reservoirs. There are five wells at “Soka Jingga” Field, namely DZ-1, DZ-2, DZ-3, DZ-4, and DZ-5. The objective of this study is to assess the CCS potential in the laminated sand interval of the “Soka Jingga” Field. The research method used is petrophysical analysis. The petrophysical data processing results show porosity values ranging from 23% to 35.5% with a net reservoir thickness ranging from 5.25 ft to 65 ft. The highest capacity was found in DZ-4 in the Zelda Member Zone 3, amounting to 37,923,654,924.52 kg or 37,923,654.92 tonnes. Summing the total capacity at "Soka Jingga" Field, the total CO2 storage capacity in the research area is 125,169,497,575.91 kg or 125,169,497.58 tonnes.

ASOSIASI FASIES & REKONSTRUKSI PALEOGEOGRAFI PADA ZONA TRANSISI FORMASI TALANGAKAR, CEKUNGAN ASRI, LEPASPANTAI BLOK TENGGARA SUMATRA, INDONESIA Ralanarko, Dwandari; Iqbal Ramadhan, M.; Fauzielly, Lili; ⠀, Winantris; Syafri, Ildrem; ⠀, Abdurrokhim
JURNAL GEOLOGI KELAUTAN Vol 19, No 2 (2021)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.19.2.2021.736

Lapangan Widuri terletak pada konfigurasi antiklin tersesarkan yang terletak pada back arc basin Cekungan Asri, Sumatera Tenggara yang berumur Paleogen. Lapangan Widuri pertama kali dilakukan pemboran sumur eksplorasi pada tahun 1988 pada reservoir Batupasir Formasi Talangakar. Penelitian terdahulu belum pernah mengintegrasikan data sumur dan data seismik 3D untuk mengidentifikasi penyebaran reservoir batupasir dan rekonstruksi paleogeografi, sehingga dilakukan penelitian pada interval reservoir 35-A dan 34-B yang merupakan dua dari enam reservoir produktif di Lapangan Widuri. Tujuan dari penelitian ini adalah untuk pengkarakterisasian asosiasi fasies dan rekonstruksi paleogeografi dengan mengintegrasikan data deskripsi batuan inti, petrografi, log tali kawat, biostratigrafi, uji sumur, dan seismik 3D. Metode yang digunakan meliputi analisis fasies dan lingkungan pengendapan, analisis stratigrafi sikuen, pemetaan struktur, geometri reservoir, hingga rekonstruksi pengendapan.. Hasil analisis pada interval 35-A dan 34-B tersusun atas sembilan litofasies yaitu, F1, F2, F3, F4, F5, F6, F7, F8, F9. Interval 35-A menunjukkan lingkungan pengendapan Fluvial dengan 3 asosiasi fasies yaitu, Fluvial Channel, Floodplain, dan Swamp, sedangkan pada interval 34-B menunjukkan lingkungan pengendapan Fluvio-Tide Delta dengan 3 asosiasi fasies yaitu, Distributary Channel, Tidal Flat, dan Swamp. Distribusi fasies Channel digambarkan pada analisis geometri, stratigrafi sikuen, dan seismik 3D yang menunjukkan arah pengendapan dengan arah Baratlaut – Tenggara. Data biostratigrafi berupa kemunculan akhir fosil polen berumur Oligosen Akhir dan kemunculan awal fosil foraminifera berumur Miosen Awal menunjukkan perubahan paleoenvironment secara gradual dari terrestrial (darat) menjadi transisi, serta paleoclimate dari iklim basah menjadi iklim kering yang terjadi pada rentang umur Oligosen Akhir – Awal Miosen. Berdasarkan data batuan inti yang menunjukkan perubahan litofasies Batupasir simpang siur dan Batulempung masif menjadi Batupasir flaser dan Batulempung lenticular mencirikan pengaruh dari pasang surut air laut yang dikontrol oleh curah hujan dan iklim. Paleogeografi pada Interval 35-A dan 34-B secara umum mengikuti dua tahapan perekahan tektonik yaitu: 1) fase Late Syn-Rift dicirikan oleh lingkungan sungai berkelok dan dataran Alluvial pada interval 35-A (Oligosen Akhir); 2) fase Early Post-Rift, dicirikan oleh lingkungan sungai berkelok dan Deltaic pada interval 34-B (Miosen Awal).

Physics-Guided Multi-Attribute Petrophysical Inversion for Quantifiying Acoustic Impedance and Porosity in the F3 Reservoir Rahman, Fadhlur; Haris, Abdul; Ralanarko, Dwandari; Purba, Humbang; Rulandoko, Wrahaspati; Riyadi, Praditio; Nafian, Muhammad
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics AL-FIZIYA JOURNAL OF MATERIALS SCIENCE, GEOPHYSICS, INSTRUMENTATION AND THEORETICAL PHYSICS VOL.7, N
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v7i2.47186

This study introduces a physics-guided multi-attribute inversion (PG-MAI) approach to estimate acoustic impedance and porosity from post-stack seismic data using Bayesian Ridge Regression. The method integrates ten seismic attributes—including amplitude, frequency, and geometric features—into a regularized linear regression framework with Bayesian formulation. Applied to the F3 Block in the Dutch North Sea, the workflow includes temporal upsampling, attribute extraction, and model calibration using two well logs. The inversion results demonstrate high spatial coherence and alignment with geological structures. Validation at both wells shows strong agreement between predicted and measured log values, with correlation coefficients exceeding 0.90 for both acoustic impedance and porosity. Zones of low impedance and high porosity correspond to interpreted deltaic sands and lobate geometries, reflecting the facies heterogeneity of the F3 depositional environment. These outcomes suggest that the inversion framework effectively captures lithological variability, making it valuable for reservoir delineation in similarly complex siliciclastic systems.

Lithofacies, Facies Association, and Depositional Environment of 34-1, 33-6, and 33-4 Sandstone, Wida Field, Gita Member, Talang Akar Formation, Asri Basin, Offshore Southeast Sumatra Saputra, Adi Danu; Surjono, Sugeng Sapto; Winardi, Sarju; Setyadi, Abdul Latif; Ralanarko, Dwandari
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12011

Three Gita Member reservoirs 34-1, 33-6, and 33-4 produce from solution gas drive with rapid pressure decline and low recovery factor. After successful oil production enhancements through waterflooding injections prompt the need for a reservoir model in further field development. Before such models were built reservoir characterization was carried out to determine facies and depositional environment for facies modeling. The study integrated core, wireline log, petrophysical logs, seismic attribute, petrography, etc. Next, well correlation was carried out to distribute stratigraphic markers. Finally, seismic attribute and well correlation were integrated to construct pie chart and depositional environment map. External geometry from seismic attribute revealed distributary channel with point bars which act as reservoir and consist of medium-fine grained planar tabular cross bedding sandstone, mud drapes sandstone, and ripple-wavy lamination sandstone. The wireline log showed fining-upward pattern and core displayed abundant channel rip up clasts, sharp or erosional contact with underlying lithology. Frequent mud drapes found within channel sandstone indicate tidal influence in proximity to marine environment probably in lower delta plain. Channels are trending west-east (34-1) and north-south (33-6 and 33-4). Other facies associations are shallow marine, swamp, interdistributary bay, and tidally influenced interdistributary bay. Shallow marine FA consists of skeletal limestone (Lm), calcareous mudstone, and calcareous sandstone (Sc). Rootlet mudstone (Fb) and interlamination of carbonaceous mudstone with very fine-grain sandstone (Fl) formed interdistributary bay FA. Swamp FA consists of coal and coaly mudstone. Tidally influenced interdistributary bay FA consists of carbonaceous laminated mudstone high in carbon (Flb), intensely bioturbated carbonaceous mudstone (Flb), very finely laminated mudstone-very fine grain sandstone (Fl) and black fissile shale (Fm).

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