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INDONESIA
Journal of Geosciences and Applied Geology
Published by Universitas Padjadjaran
ISSN : 25793136     EISSN : 25793136     DOI : https://doi.org/10.24198/gsag.v7i3
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
Journal of Geological Sciences and Applied Geology (GSAG) is a National multidisiplinary Journal focus on Geological Sciences, Applied Geology, and Geological Engineering and Earth Science. Our Mission is to publish research related to (but not limited) Geology Petrology Paleontology Stratigraphy Sedimentology Remote Sensing Geomorphology GIS Engineering Geology Geotechnics Geochemistry Geophysics Geological Hazard and Disaster Geopark Hazard Mitigation Geography Earth Sciences
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 140 Documents
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LAND MOVEMENT VULNERABILITY ZONING IN THE HILLY AREA OF NORTHERN CILACAP, CENTRAL JAVA Nurfadli, Eza; Sukiyah, Emi; Gani, Reza Mohammad Ganjar; Ramadian, Aldrin
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.v8i1.57140

Abstract

The northern part of Cilacap has an area with hilly morphology with slopes that are relatively gentle to steep. The geological setting in this region is quite complex, the combination of tectonics and the physical properties of the rocks means that this region is strongly deformed. This has an impact on areas prone to landslides as one of land movement types. To what extent can this area be classified based on the vulnerability of its land to landslides is the problem be studied. There are five aspects used in this research, namely rainfall, rock type, slope, land cover and soil type. The multi-aspect overlay method is used to determine the spatial distribution of land movement-prone zones. Geographic Information System-based software support makes the data analysis process easier. Based on the results of the spatial analysis of five aspects, it was concluded that the North Cilacap area could be grouped into 3 land movement vulnerability zones, namely the low vulnerability zone with a score of 8-17, the medium vulnerability zone with a score of 18-27, and the high vulnerability zone with a score of 28-37. The complex tectonic order is the main controller of land movement events in this region.
SIMULATION OF DISPOSAL SLOPE DESIGN USING THE SPENCER METHOD IN THE SOFT MATERIAL AREA OF PT XYZ, BERAU, EAST KALIMANTAN Afiah, Mahda; Muslim, Dicky; Fachrudin, Kurnia Arfiansyah; Anhar, Jevye Fazrin Kusumah
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.v8i1.55283

Abstract

PT XYZ is a coal mining company utilizing an open-pit mining system, currently serving as the subject of this research. Every mining activity requires a disposal area to place the residual materials covering the mineral deposits. This study aims to analyze the disposal slope's stability in accordance with KEPMEN ESDM No.1827 Tahun 2018. The slope design simulations were conducted using limiting variables, like the bench angle of 35°, bench heights of 5 meters and 10 meters, and bench widths of 10 meters, 20 meters, and 30 meters. Input data comprised material properties such as unit weight, cohesion, and internal friction angle for materials including soft clay, dense clay, bund wall, and waste. The data was obtained by tests on basic physical properties and triaxial compression tests. The conditions assumed the slope was saturated groundwater level while considering the earthquake coefficient. This research employed the Spencer method for slope stability analysis, resulting in a safe and volumetrically efficient slope design with bench angle angle of 35°, bench heights of 5 meters, and bench widths of 30 meters with the safety factor 1,11.
BRIEF UNDERSTANDING OF CHARACTERISTICS DEPLETED RESERVOIR (INTERVAL-I) USING PORE PRESSURE AND FRACTURE GRADIENT ANALYSIS IN "X" FIELD, SANGA-SANGA AXIS, KUTAI BASIN Morang, Febrika Situ; Abdurrokhim, Abdurrokhim; Mohammad, Febriwan; Prasetyo, Anggit Chandra; Savitri, Cindy Dhevayani; Nursasono, Danny
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.v8i1.55336

Abstract

Field X, as this study area's focus, boasts over 200 wells proven to be hydrocarbon producers. Two pore pressure regimes exist: normal hydrostatic and overpressure. The primary hydrocarbon reservoir in the Balikpapan Formation within the Sanga- sanga axis at Field X consists of sandstone. Drilling disturbances, particularly in the lower intervals of this reservoir, often occur due to overpressure. The main challenge encountered in this reservoir is mud losses. The objective of this study is to develop the Pore Pressure and Fracture Gradient characteristics and its relation to the geological environment. Furthermore, the distribution of Sand (Interval-I) is determined, which is the primary cause of losses due to production. Besides that, the parameters used to create optimal fracture gradient is also defined. Thirteen wells in this field were examined to identify the controlling factors of pore pressure. This study integrates wireline logging, velocity, mud logs, pressure tests, drilling parameters and event which are subsequently processed for determining shale points, Normal Compaction Trend (NCT), calculating overburden gradient, and estimating pore pressure using the Eaton method. From the analysis result, the distribution of overpressure and the generating mechanism of overpressure are determined. This study also carried out analysis to determine overpressure and depleted Sandstone (Interval-I) distribution. Subsequently, facies and depositional environtment analysis are conducted, followed by modelling Sandstone (Interval-I) and determining Sandstone’s poisson ratio from loss data and shale’s from leak of test data for fracture gradient estimation. Overpressure is found in Interval-I with magnitude of 4000-4700 psi, which corresponds to delta plain to delta front depositional environment. Top of overpressure is observed shallower in the southern than northern due to geological structure conditions. The generating mechanism of overpressure is caused by loading and hydrocarbon generation. The experienced loss in overpressure zone, caused by reservoir production from the initial pressure of 4475 psi and has depleted to 373 psi. From the sandstone distribution model, the loss sandstones are a connected fluvial channel in southern ward. It is also observed several unconnected channel sandstones that did not experience loss. Poisson ratio parameter for sandstone is 0.35, which is calibrated from the loss event with minimum fracture gradient in Interval-I is approximately 4772 psi. It is expected that the understanding of pore pressure and Sandstone (Interval-I) distribution could be used to increase the success ratio for optimal drilling planning, including to choose effective casing design, mud weight, and appropriate total depth.
DESIGNING A GEOMETRY OF LOWWALL SLOPE IN COAL MINING USING THE LIMIT-EQUILIBRIUM METHOD AT THE WORKING AREA OF PT. PETROSEA TBK, TARAKAN BASIN, NORTH KALIMANTAN, INDONESIA Fauzan, Aldo; Muslim, Dicky; Endyana, Cipta; Wandani, Diki; Fiverno, David Feby; Putra, Rieza Rachmat
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.v8i1.56527

Abstract

Mining, which involves extracting minerals and utilizing natural resources, requires careful planning to ensure feasibility and safety. A critical aspect of open pit mine design is slope stability, influenced by geological characteristics, slope topography, and groundwater conditions. Slope stability analysis, using methods such as the Limit Equilibrium Method (LEM), which has been popular for decades for its convenience, evaluates the potential for slope failure and provides geometric slope design recommendations to reduce risk, improve operational efficiency, and ensure environmental sustainability. The research was conducted at PT Petrosea Tbk, with the mine site in Sebakis Village, Sebuku Subdistrict, Nunukan Regency, North Kalimantan, PT X region. The research object is a lowwall slope that requires stability analysis to prevent landslides. The slope safety criteria are based on the Minister of Energy and Mineral Resources Decree No. 1827 K/30/MEM/2018 guidelines, specifically 1.1. To perform the analysis, laboratory test data is required, including rock physical property tests and rock shear strength tests to obtain material property values. This data was then analysed using Rocscience Slide2 software by comparing three methods: Bishop, Janbu, and Morgenstern-Price. The analysis was conducted based on the actual conditions of each slope cut geometry. If the obtained safety factor does not meet the criteria of the Minister of Energy and Mineral Resources Decree No. 1827 K/30/MEM/2018, then designing a geometry of lowwall slope is required. The geometric slope design used on the lowwall slope includes creating benches to flatten the slope level, and installing drain holes to decrease the ground water level. 
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

Abstract

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.
GEOMORPHOLOGICAL ASPECT ANALYSIS IN CIKANGKUNG AND SURROUNDING AREA, CIRACAP SUBDISTRICT, SUKABUMI REGENCY, WEST JAVA Maulana, Muhammad Hafidz; Pratiwi, Santi Dwi; Rosana, Mega Fatimah
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.60774

Abstract

The Ciletuh–Jampang area, located in the southern part of Java Island exhibits distinct geomorphological characteristics shaped by a combination of endogenous and exogenous geological processes over an extended period. This study analyzes the geomorphology of the region using field observations and remote sensing, focusing on morphographic, morphometric, and morphogenetic aspects, specifically in Cikangkung area, Ciracap Subdistrict, Sukabumi Regency, West Java. Based on those three geomorphological aspects, this area could be divided into four different units, such as marine lowland, denudational lowland, gently sloping structural lowhills, and sloping structural lowhills. These units are formed by interactions between tectonic activity, volcanism, weathering, erosion, and sedimentation processes. Tectonic uplift, volcanic contributions, and variations in rock resistance have significantly influenced landforms, while exogenous processes have shaped terrain forms, drainage patterns, and top-soil thickness. The results reveal that these processes not only define the region's unique morphological features but also influence its diverse land use practices, including agriculture and settlements. Keyword: Geomorphology, Ciletuh-Jampang, Cikangkung, Landform, Remote Sensing
IDENTIFICATION OF GEOTHERMAL PROSPECT AREAS USING REMOTE SENSING TECHNIQUES IN THE MOUNT GALUNGGUNG REGION Irsyanda, Keisya Adiva; Haryanto, Agus Didit; Hutabarat, Johanes
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.57274

Abstract

Geothermal energy sources are economical and have significant potential because Indonesia is located in the Ring of Fire area, which results in numerous tectonic processes that play a role in the emergence of geothermal resource potential. Among Indonesia's many geothermal energy potentials, one is the geothermal resource found in Tasikmalaya Regency, particularly in Mount Galunggung, an area with a geothermal system, as evidenced by geothermal manifestations. This research aims to determine the location of geothermal prospect areas using remote sensing techniques before conducting further research on the reservoir characteristics in a geothermal system in a given area. The study was conducted by analyzing surface temperature, structures in linear features, and field surveys to confirm the location of geothermal manifestations. The research results indicate geothermal prospect areas in the Mount Galunggung region in Sukaratu District, with surface temperature results ranging between 13-29°C.
ANALYSIS OF GRAIN SIZE AND MINERALOGY OF HEAVY MINERAL GRAINS IN PALANGKA RAYA AREA, CENTRAL KALIMANTAN PROVINCE Nurzakiyah, Halimah; Rosana, Mega Fatimah; Sunarie, Cecep Yandri; Ernowo, Ernowo
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.58052

Abstract

The Palangka Raya area is situated on the island of Borneo, specifically within the Central Kalimantan province. The study area is composed of a lithological sequence comprising fine-coarse quartz sandstone and cross-layered conglomerate, with components in the form of malleable and granitic rocks from the Dahor Formation (TQd) and alluvium deposits. This sequence has the potential for heavy mineral deposits associated with sedimentary sands. This study aimed to calculate and identify grain size and heavy mineral content distribution within the investigated area. The research was conducted using a combination of grain size analysis and grain mineralogy analysis on six mesh numbers. The results of the grain size analysis indicate that the majority of samples exhibit grain sizes within the mesh numbers -10+18 and -60+140. The results of the grain mineralogy analysis revealed the presence of heavy minerals, including cassiterite, hematite, biotite, chalcopyrite, zircon, rutile, ilmenite, garnet, amphibole, and staurolite. Heavy mineral variations were observed on mesh numbers -60+140 and <140. These minerals are believed to have originated from metamorphic rocks, S-type granitic rocks, and I-type granitic rocks.
MINERALOGY AND SEDIMENT DISTRIBUTION BASED ON GRAIN SIZE ANALYSIS IN THE KAPUAS AREA, CENTRAL KALIMANTAN Diwantara, Raja Hertansyah; Rosana, Mega Fatimah; Sunarie, Cecep Yandri; Ernowo, Ernowo
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.58054

Abstract

The Kapuas region in Central Kalimantan exhibits intriguing geological potential due to the presence of a large river and sediment flows closely associated with fluvial activity. This study aims to identify the distribution of sediment grain sizes and the presence of heavy minerals in the study area. Sediment sampling locations were identified at four points using shallow drilling techniques, specifically with a hand auger. The research methods employed include grain size analysis (granulometry) and grain counting analysis using polarized microscopy. The results indicate that the grain sizes in the study area range from coarse to fine sand. The sediment transport mechanism occurs as bedload for coarse-sized sediments and in suspension for fine-sized sediments. The mineralogical composition of sediments in the study area contains heavy minerals such as rutile, ilmenite, cassiterite, biotite, hematite, zircon, and chalcopyrite. The varied mineral content reflects a source material origin from acidic to intermediate igneous rocks and metamorphic rocks. This indicates a complex and dynamic geological history in the region.
IDENTIFICATION OF MASS MOVEMENT VULNERABILITY ZONES USING STORIE METHOD IN BARUNAI AND SURROUNDING AREAS, LEBAK REGENCY, BANTEN PROVINCE Hutauruk, Gita Agnes Meilani; Yuningsih, Euis Tintin; Patonah, Aton; Arfiansyah, Kurnia
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.58072

Abstract

Natural processes cause mass movement when slope materials, such as soil, rock, and mixed materials, shift from their original positions in a vertical, horizontal, or inclined orientation. A number of factors, including a relatively steep slope, the status of the rock or soil that forms the slope, intense rainfall, unchecked human activity that exploits the environment, and the state of geological structures, contribute to the movement. The research site is located in Cihara District, Lebak Regency, Banten Province, specifically in the Barunai area. Because of their proximity to fault lines and subduction zones, these study areas are susceptible to mass movement, particularly during the wet season. The goal of this study is to pinpoint the regions that are most vulnerable to mass movement. By determining the parameter that is thought to influence mass movement, the Storie method is one technique used to pinpoint the places that are vulnerable to it. The parameters include factors like land usage, type of soil, rainfall, slope, lithology, and geological structures. The research locations are categorized into two levels of mass movement vulnerability based on the analysis result: high, as much as 34.1%, and moderate as much as 65.9%, across the entire research region.

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