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All Journal Indonesian Journal of Geography Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Journal of Mathematical and Fundamental Sciences BULLETIN OF THE MARINE GEOLOGY Indonesian Journal on Geoscience Indonesian Journal on Geoscience Berita Sedimentologi Journal of Business, Social and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Geosciences and Applied Geology
Edy Sunardi
Fakultas Teknik Geologi, Universitas Padjadjaran
Astronomy Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Physics Social Sciences

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MIDDLE MIOCENE TO HOLOCENE GEOLOGICAL HISTORY AND POTENTIAL OF BABAKAN JAWA AREAS, MAJALENGKA DISTRICT OF WEST JAVA-INDONESIA Ambari, Wardahrose Dhifa; Sunardi, Edy; Ilmi, Nisa Nurul
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.v9i1.69279

Abstract

Geological mapping activities were conducted in the Sidamukti, Babakan Jawa, Cibodas areas and surroundings, Majalengka District, West Java Province. The main objective of this research is to determine the geomorphological characteristics, lithology, geological structures, and geological potential in the research area. The methods used include field observations, laboratory analysis, interpretation of topographic maps and satellite imagery, as well as structural analysis using stereonet. The research results show that the geomorphology of the study area was formed by the interaction of endogenic forces (tectonic and volcanic) and exogenic forces (weathering and erosion), resulting in five main geomorphological units. The stratigraphy of the area consists of five rock units composed of claystone units from the Middle Miocene to Holocene alluvial deposits. The developed geological structures indicate the influence of extensional stress with a strike-slip component that forms normal faults and reverse faults trending northwest–southeast. The geological potential of the area includes resources such as andesite stone, sand, and gravel, as well as the geotourism potential of Taman Gunung Batu Karang. On the other hand, steep hilly areas with weathered lithology show vulnerability to mass movements, making them landslide-prone areas. The results of this mapping are expected to serve as a basis for sustainable natural resource management and geological disaster mitigation.
GEOLOGY OF KADU AND SURROUNDING AREA, JATIGEDE AND JATINUNGGAL DISTRICTS, SUMEDANG REGENCY, WEST JAVA PROVINCE Alvionita, Azizah Tiara; Sunardi, Edy; Ilmi, Nisa Nurul
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.v9i1.69203

Abstract

Administratively, the research area is located in Kadu and its surrounding areas, Jatigede and Jatinunggal Districts, Sumedang Regency, West Java Province. This study aims to determine the geological conditions and geological history of the research area. The research method consists of three stages: literature study, field observation for data collection, and studio observation combined with laboratory analysis. Based on geomorphological aspects, the research area is divided into three geomorphological units, namely moderately steep denudational low hills, steep structural elongated hills, and very steep structural sedimentary hills. Field observations indicate that the lithostratigraphic units are grouped into four units arranged from oldest to youngest: claystone unit (Sbl), sandstone unit (Sbp), tuff unit (St), and volcanic breccia unit (Sbv). The claystone and sandstone units were deposited simultaneously during the Middle Miocene in a deep marine environment. Subsequently, during a slightly younger period, the tuff unit (St) was deposited conformably with the sandstone unit. Geological structures developed in the study area include anticline and syncline folds formed in the Late Miocene due to compressional tectonic activity, with the principal stress direction trending northeast–southwest. Other structures such as joints and indications of strike-slip faults are also observed. The volcanic breccia unit (Sbv) was deposited from ancient volcanic eruptions in a disconformable relationship with the claystone unit (Sbl) during the Late Pliocene. Geological resources in the study area include andesite quarrying as well as tourism potential at Mount Jagat and the Pine Forest. The main geological hazard in the area is landslides.
Evaluation of the Effectiveness of CO₂ Nanobubbles as an Enhanced Oil Recovery Method on Low Permeability Artificial Core Adsura, Softy Putri; Sunardi, Edy
Journal of Business, Social and Technology Vol. 7 No. 1 (2026): Journal of Business, Social and Technology
Publisher : Politeknik Siber Cerdika Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59261/jbt.v7i1.592

Abstract

Background: Low-permeability reservoirs, characterized by limited pore connectivity and dominance of capillary forces, present significant challenges to conventional Enhanced Oil Recovery (EOR) methods. Water flooding often fails to mobilize residual oil in such reservoirs, which typically results in low recovery factors. Objective: This study aims to evaluate the effectiveness of the Enhanced Oil Recovery (EOR) method based on CO₂ nanobubbles in low-permeability artificial cores with matrix-supported characteristics. Methods: Experimental analysis was conducted on artificial cores fabricated from 80% quartz sand and 20% Portland cement. The study involved petrophysical characterization, oil saturation, and core flooding experiments using both water flooding and CO₂ nanobubble injection. Scanning Electron Microscopy (SEM) was used to observe microstructural changes and fluid redistribution. Results: The initial characterization of the artificial core showed a porosity of ±31% and permeability of approximately 5 mD. Water flooding did not increase the recovery factor (RF = 0%), while CO₂ nanobubble injection achieved a recovery factor increase of ±3.76%. SEM observations revealed more uniform fluid redistribution and reduced residual oil after nanobubble flooding, confirming the effectiveness of CO₂ nanobubbles in mobilizing oil from tight pore systems. Conclusion: The study concludes that CO₂ nanobubble-based EOR is effective in low-permeability reservoirs, with scale compatibility between nanobubble size and pore throat geometry playing a crucial role in enhancing recovery. This approach offers a promising direction for optimizing EOR in tight reservoirs.
Co-Authors . Irawati Abdurokhim Abdurokhim Abdurrokhim ⠀ Abdurrokhim, . Adhiperdana, Billy G. Adhiperdhana, Billy Gumelar Adjat Sudradjat -, Adjat Sudradjat Adjat Sudrajat Adsura, Softy Putri Adycipta Anis Prawoto, Adycipta Anis Agung Mulyo Agus Ardianto Budiman Ahmad Helman Hamdani Alvionita, Azizah Tiara Ambari, Wardahrose Dhifa Andi Agus Nur Andriana, Yoga Arifin, Alvin Adam Ayu, Shinta Billy G Adhiperdana Billy G. Adhiperdana Carrisa, Dea Darwansyah, Fiqry Djadjang Jedi Setiadi Dwandari Ralanarko Dzul Fadli Edison Gunawan Sirodj Emi Sukiyah Eric Wijaya Faisal Helmi Faizal Muhamadsyah -, Faizal Muhamadsyah Fauziely, Lili Ginting, Agus Santa Haqiqie, Fauzan Aditya Hendarmawan, . Heni Pujiastuti Herida, Shaskia Herman Darman Ildrem Syafri Indra Nurdiana Ismawan - Iyan Haryanto Johanes Hutabarat KAMILA, PUTRI Lamba, Lisa Muhammad Irwansyah, Muhammad Muhammad Kurniawan Alfadli Nanda Natasia Nisa Nurul Ilmi Nurdrajat Nurdrajat Oeke Sobarin -, Oeke Sobarin Pranopto, Andri Pranowo Nugroho Pusparini, Widyatri Rakhmat Fakhruddin Saputro, Anisa Ayu Saragih, Rahmat Yantono Sendjadja, Yoga Andriana Sentani, Eddy Arus Suparka -, Suparka Suryanegara, Yoga SYABAN, FARHAN TAUFIK Syaiful Alam Taufik Ramli Vijaya Isnaniawardhani Wardhani, Vijaya Isnania Yarra Sutadiwiria Yeftamikha, . Yoga Andriana Sendjaja Yunita Rossa Indah Putri, Yunita Rossa Yusi Firmansyah, Yusi