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Determinasi Karakteristik Reservoir Formasi Talang Akar Berdasarkan Data Well Log dan Seismik Sub-Cekungan Palembang Selatan, Cekungan Sumatera Selatan Yuniardi, Yuyun; Mardiana, Undang; Mohammad, Febriwan; Nur, Andi Agus; Alfadli, Muhammad Kurniawan; Mutaqin, Deden Zaenudin
Bulletin of Scientific Contribution Vol 20, No 3 (2022): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v20i3.44360

Penentuan Karakteristik reservoir merupakan suatu upaya untuk mengetahui kualitas reservoir dari suatu tubuh batuan dalam perkiraan prospek atau tidaknya lapisan reservoir tersebut. Penelitian ini dilakukan pada formasi Talang Akar yang masuk kedalam Sub-Cekungan Palembang Selatan, Cekungan Sumatera Selatan, dengan menggunakan data well, data seismik, data SWC dan data Mudlog. Formasi talang akar menunjukan lingkungan delta plain dimana zona reservoirnya yang merupakan bagian bawah dari formasi tersebut termasuk dalam lingkungan fluvial. Pada klasifikasi parasekuen formasi talang akar terdapat siklus regresi-transgresi yang membentuk pola pengendapan progradasi dan retrogradasidalam skala kecil dengan rincian Sumur X1, X2, dan X3 terdapat 4 parasekuen, sedangkan sumur X4 dan X5 berjumlah 5 parasekuen, secara kuantitatif, nilai-nilai perhitungan petrofisika menunjukan bahwa pada zona hidrokarbon mempunyai Sw berkisar 8-46%, porositas 13-30%, sedangkan zona air memiliki Sw 65-100 %, dan porositas 8-25%. Berdasarkan peta kontur struktur dan peta net san top zona C3, ke lima lapisan batupasirnya pada tiap sumur terletak pada antiklin, dimana arah pengendapan yang relative berarah Timur Laut – BaratDaya. Berdasarkan paparan diatas, pada langkah eksplorasinya telah ditentukan bahwa zona reservoir yang ekonomis pada daerah penelitian terdapat pada zona C3 sumur X5. Katakuci : Batupasir, Formasi Talang Akar, Parasekuen, Petrofisika, Prospek, Reservoir.

STRUKTUR GEOLOGI CEKUNGAN OMBILIN BERDASARKAN INTERPRETASI CITRA SATELIT -, Yuyun Yuniardi
Bulletin of Scientific Contribution Vol 8, No 2 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Interpretation of remote sensing data on Ombilin Basin has resulted Geological Map Interpretation of the basin which is containing information about geological structure of the Ombilin Basin. Further more, this geological structure can be divided into two periode which are Paleogene geological structure and Neogen geolocical structure.

AKTIVITAS TANAH LAPUKAN BREKSI VULKANIK DAN IMPLIKASINYA TERHADAP KEKUATAN FONDASI DI JATINANGOR -, Irvan Sophian; -, Zufialdi Zakaria; -, Yuyun Yuniardi
Bulletin of Scientific Contribution Vol 5, No 1 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Jatinangor require public facility. The facility need strength of soil bearing capacity for stable foundation in occupying each soil mass. Soil type in this area is CH ( clay of high plasticity) and MH (silt of high plasticity). Based on diagram of Cassagrande, area research reside between U-line and A-line, and soil type generally is CH, clay high plasticity.At soil which have medium-high activity, allowable soil bearing capacitry ( qa) for continuous foundation is between 31.450 until 52.884 T/m2. Soil bearing capacity ( qa) with activity number (A) show negative relationship ( R - 0.804058). Increasing soil activity caused decreasing soil baring capacity.Instruction of Environmental Monitoring Plas is done especially monitoring at condition of house building and also other medium building like drainage channel and bridge etcetera. Environmental monitoring is required as effort to anticipate damages of arising out effect of negative impact. Small damage is properly attention or improve repaired before becoming is big.

DELINIATION OF SHALLOW GAS ZONE POTENTIAL USING SUBSURFACE DATA APPROACH IN ‘X’ FIELD KUTAI BASIN Yuniardi, Yuyun; Alfadli, Muhammad Kuniawan; Mohammad, Febriwan; Natasia, Nanda; Nur, Andi Agus
Bulletin of Scientific Contribution Vol 23, No 2 (2025): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v23i2.65622

The presence of shallow gas (Shallow Gas) in exploration wells poses significant operational risks, including kicks or blowouts during exploration activities. To mitigate these risks, it is essential to delineate subsurface data and identify areas potentially containing shallow gas. Subsurface interpretation was conducted using various datasets, including electrolysis cutting analysis, well log data (GR, RT, NEU, RHOB) from 39 wells, and gas data obtained from chromatograph-based mud logs. Well correlation was performed to identify anomalies, gas presence, and facies characteristics.The primary stratigraphic marker surfaces indicative of shallow intervals in Field X are, from deeper to shallower, MF2, Fs-s1, s2-Fs, Fs-s3, Fs-s4, Fs-s5, and Fs-s6, with the shallow gas accumulation predominantly observed within the intervals associated with Fs-s2 and Fs-s3, at depths ranging from approximately 950 to 1300 meters below sea level (MSS). These intervals demonstrate isolated gas accumulations, primarily comprising methane (C1), with minor traces of C2, C3, C4, and C5 gases detected in the shallow zone above the marker MF2.Gas analysis indicates a surge in total gas content within the 950-1300 MSS interval, correlating with anomalies identified from the Master Log data. This surge is attributed to limestone and coal layers, as corroborated by gas bearing reservoir mapping.Based on the analyzed data, it can be concluded that shallow gas accumulations are localized within the 950-1300 MSS interval, specifically between the Fs-s2 and Fs-s3 markers. For subsequent drilling activities on Platform M, it is recommended to monitor and consider this depth zone to mitigate related risks effectively.

KESESUAIAN BATUBARA LAPISAN D UNTUK PROSES GASIFIKASI BAWAH PERMUKAAN Salinita, Silti; Purnama, Asep Bahtiar; Yuniardi, Yuyun; Nurdrajat; Sendjaja, Yoga A.
Jurnal Teknologi Mineral dan Batubara Vol 20 No 3 (2024): Jurnal Teknologi Mineral dan Batubara Edisi September 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No3.2024.1575

Coal seam D is part of the Suban Burung Block, Muara Enim Formation, Central Palembang Subbasin, South Sumatra Basin, and is dated to the Middle to Late Miocene. The aims of this study is to determine the suitability of coal characteristics for (UCG) technology. The research was conducted on coal samples from seam D obtained from drilling during Underground Coal Gasification activities that utilized using the maceral composition method for coal utilization. Several coal quality parameter were tested, including calorific value, vitrinite reflectance, total sulfur content, ash content, total moisture content, ash fusion temperature, alkali oxide content (Na₂O + K₂O), maceral composition (vitrinite, liptinite, and inertinite), volatile matter content, as well as carbon and hydrogen content. Additionaly, to assess its applicability for UCG, the parameters of coal seam thickness and depth were also considered. The study results indicate that the characteristics of coal seam D has suitable for normative combustion and gasification using a fixed bed gasifier, a process similar to underground coal gasification. The thickness and depth of coal seam D are suitable for the application of Underground Coal Gasification (UCG) technology.

KESESUAIAN BATUBARA LAPISAN D UNTUK PROSES GASIFIKASI BAWAH PERMUKAAN Salinita, Silti; Purnama, Asep Bahtiar; Yuniardi, Yuyun; Nurdrajat; Sendjaja, Yoga A.
Jurnal Teknologi Mineral dan Batubara Vol 20 No 3 (2024): Jurnal Teknologi Mineral dan Batubara Edisi September 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No3.2024.1575

Coal seam D is part of the Suban Burung Block, Muara Enim Formation, Central Palembang Subbasin, South Sumatra Basin, and is dated to the Middle to Late Miocene. The aims of this study is to determine the suitability of coal characteristics for (UCG) technology. The research was conducted on coal samples from seam D obtained from drilling during Underground Coal Gasification activities that utilized using the maceral composition method for coal utilization. Several coal quality parameter were tested, including calorific value, vitrinite reflectance, total sulfur content, ash content, total moisture content, ash fusion temperature, alkali oxide content (Na₂O + K₂O), maceral composition (vitrinite, liptinite, and inertinite), volatile matter content, as well as carbon and hydrogen content. Additionaly, to assess its applicability for UCG, the parameters of coal seam thickness and depth were also considered. The study results indicate that the characteristics of coal seam D has suitable for normative combustion and gasification using a fixed bed gasifier, a process similar to underground coal gasification. The thickness and depth of coal seam D are suitable for the application of Underground Coal Gasification (UCG) technology.

THE INFLUENCE OF SEDIMENTATION ON SALINITY VARIATION IN THE EAST KUTAI BASIN, EAST KALIMANTAN, INDONESIA Yuniardi, Yuyun; MOHAMAD, FEBRIWAN; Alfadli, Muhammad Kurniawan
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v9i1.69433

The East Kutai Basin is a major deltaic system developed under strong river-dominated sedimentary processes, characterized by long-term progradation from marine to terrestrial environments. In such deltaic settings, salinity distribution is generally expected to show systematic lateral and vertical trends, with freshwater dominating proximal facies and saline water occurring in distal marine facies, while salinity commonly increases with depth due to depositional progradation through time. This study investigates lateral and vertical salinity variations in the East Kutai Basin and evaluates their relationship with sedimentary facies distribution. Salinity data were derived from both formation water analysis and apparent water resistivity (Rwa) calculations using resistivity logs based on Archie’s equation. These data were integrated with net sand maps and electrofacies interpretations to analyze salinity patterns across multiple stratigraphic layers. The results indicate that although the general lateral salinity trend from low salinity in channel facies to higher salinity in mouth bar facies is preserved, significant anomalies are present. Laterally, mouth bar deposits locally exhibit unexpectedly low salinity values, approaching those of channel facies. Vertically, salinity decreases with increasing depth in several stratigraphic groups, contradicting the expected progradational model. These anomalies are interpreted to result from lateral shifting of depositional environments due to progradation and expulsion of low-salinity compaction water from overpressured prodelta shale into adjacent sand bodies.

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