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All Journal Indonesian Journal of Geography Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience BULLETIN OF THE MARINE GEOLOGY Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Business, Social and Technology Journal of Geosciences and Applied Geology

Edy Sunardi

Fakultas Teknik Geologi Universitas Padjadjaran

Author-ID : 568186

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Industrial & Manufacturing Engineering Social Sciences

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Karakteristik dan Lingkungan Pengendapan Batubara Eosen Formasi Batu Ayau Cekungan Kutei Atas Bagian Barat Di Daerah Murung Raya Dan Sekitarnya, Kalimantan Tengah Suryanegara, Yoga; Wardhani, Vijaya Isnania; Sunardi, Edy
Bulletin of Scientific Contribution Vol 17, No 1 (2019): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Endapan batubara di daerah penelitian termasuk ke dalam Formasi Batu Ayau yang merupakan bagian dari Kelompok Tanjung pada Cekungan Kutei Atas bagian Barat. Diidentifikasi terdapat sebanyak 22 lapisan batubara dimana 4 (empat) lapisan batubara merupakan seam utama yaitu (dari bawah ke atas): seam B (1.05m), C (1.19m), D (1.43m) dan J (1.44m). Deskripsi megaskopis lapisan batubara: berwarna hitam yang didominasi pita terang (bright) – sangat terang (very bright), pecah blocky – concoidal, dan abundant cleat. Berdasarkan analisa maseral, batubara Eosen ini dapat diklasifikasikan sebagai tipe Vitrinite A. Rank batubara di daerah penelitian adalah low – medium volatile bituminous – semi antrasite (Rv: 1.75 – 2.0 dengan VM-daf: 13.78% – 28.14%) dan memiliki kualitas batubara metalurgi dengan CSN 8.5. Fasies sedimen pembawa batubara berupa perselingan fasies batupasir dengan batulanau dengan sisipan lapisan batubara. Fasies batulanau sisipan batubara diinterpretasikan merupakan endapan rawa yang dipengaruhi oleh aktivitas limpas banjir sedangkan fasies batupasir merupakan tipe endapan channel dan point bar. Kedua fasies sedimen ini diendapkan pada lingkungan fresh water atau sistem lingkungan pengendapan fluvial dengan pola meandering dan/atau braided system yang dipengaruhi oleh floodplain. Lingkungan pengendapan ini terbagi menjadi empat siklus sekuen lingkungan pengendapan fluvial. Berdasarkan analisa kualitas conto diketahui bahwa proses coalification batubara secara vertikal dikontrol oleh proses burial depth dan secara lateral dikontrol oleh adanya struktur geologi yang diidentifikasi sebagai bagian akhir dari Adang Flexure serta oleh adanya intrusi batuan beku Sintang yang tidak tersingkap ke permukaan. Kata kunci: Batubara Eosen, Type, Rank, Batubara Metalurgi, Fluvial System, Coalification.

POTENSI HIDROKARBON FORMASI AIR BENAKAT, LAPANGAN ‘CA’, CEKUNGAN SUMATERA SELATAN Prawoto, Adycipta Anis; Firmansyah, Yusi; -, Nurdrajat; Sunardi, Edy
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Field ‘CA’ located in the South Sumatra Basin with an area of 6433 Km2. This study aimed to evaluate the hydrocarbon potential of Air Benakat Formation. Based on the results of the petrophysical analysis from well HA, BA, PA, RI and SE show the results are : Vsh cut off 0.34, Phie cut off 0.136 and SW cut off 0.59. Determination of reservoir netpay performed on HA well, that have thick of netpay 14.638 meters. The results of picking seismic horizon are time and depth structure maps of Air Benakat Formation and Gumai Formation. The map was made for determining lead in the research area. Calculation of estimated hydrocarbon reserves in the research area shows the value of OOIP is 345 MMBO.

TEKTONIK DAERAH MUARA TEBO PROPINSI JAMBI -, Iyan Haryanto; -, Ismawan; -, Faisal Helmi; -, Edy Sunardi; -, Oeke Sobarin; Indah Putri, Yunita Rossa
Bulletin of Scientific Contribution Vol 6, No 1 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Geological structure of Muara Tebo area was influenced by subduction between Eurasian and India-Australian Plates. Regional tectonic of this area dominantly yield an amount of fault structure with orientation Northwest-Southeast.Structural pattern of study area dominated by dextral strike-slip and thrust fault, with orientation Northwest-Southeast. The dextral strike-slip fault represent the first structure formed (Early Tertiary) which influenced by transtensional stress. Further, on Neogene Tectonic period the structures influenced by tranversional stress system which affecting inversion. This late tectonic yield an amount of thrust fault.

PENGARUH SESAR CIMANDIRI TERHADAP MORFOLOGI DAERAH PADALARANG Haryanto, Iyan; Sunardi, Edy
Bulletin of Scientific Contribution Vol 12, No 2 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v12i2.8367

Cimandiri Fault is a regional fault that stretching from Pelabuhanratu (Sukabumi) to end up in the complex area of Mt. Tangkubanprahu – Mt. Burangrang (Subang - Northward of Bandung). Regional fault has been widely studied, but there are differences of opinion, especially regarding the type of shift.This study aimed to examine all aspects relating to Cimandiri Fault, especially along the segment Tagokapu-Cibogo (Padalarang-Citatah), so that can be known about the type of the fault. Steps and methods of research, among others, to analyze the landscape through satelite image, make observations, descriptions and measurement of geological structure elements, data processing by program using "dip" and "Paleostress" softwares. Cimandiri fault lines along the segment Tagokapu-Cibogo, can be recognized from various aspects, among others, from the aspect of geomorphology characterized by differences in the shape and elevation of the hills; from stratigraphical aspects there are contact between rock formations of different ages; from fold structure aspects there are found standing upright rock layers; and from the aspect of fault outcrop, there were indications that the fault is generally associated with horizontal fault. From the results of the analysis showed that the lineament of Cimandiri Fault along Tagokapu-Cibogo segment, controlled by a reverse fault and normal faults that formed in different tectonic period.

VULKANISME DAN KARBONAT UMUR MIOSEN DI DAERAH BANJAR-PANGANDARAN, JAWA BARAT Haryanto, Iyan; Ilmi, Nisa Nurul; Adhiperdana, Billy G.; Fauziely, Lili; Sunardi, Edy
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Daerah Banjar-Pangandaran merupakan bagian dari Zona Pegunungan Selatan yang sebagian besar disusun batuan volkaniklastik Formasi Jampang. Batuannya didominasi oleh breksi, tuf dan batupasir kasar. Seluruhnya membentuk morfologi perbukitan sedang hingga terjal, dengan punggungan berarah barat-timur. Di bagian tepi dari lereng perbukitannya, tersingkap batugamping yang berumur lebih muda, yaitu Formasi Klapangunggal dan Formasi Pamutuan. Di lapangan tidak ditemukan kontak litologi, namun berdasarkan pada umur batuan yang menerus, serta kedudukannya di lapangan diduga keduanya memiliki hubungan stratigrafi yang selaras. Penelitian ini masih dalam tahap awal yang dilakukan hanya berdasarkan pada data singkapan. Analisis dilakukan dengan melakukan rekontruksi pola struktur (pola jurus), serta dipandu dengan interpretasi geologi melalui DEM.Hasil sementara menunjukan bahwa pertumbuhan carbonate mulai berlangsung ketika aktivitas volkanisma pawa waktu Miosen Bawah Berakhir. Pada saat itu di antara tinggian volkanik, memiliki lingkungan marin yang tenang dan dangkal, sehingga memungkinkan terbentuknya pertumbuhan carbonate. Di lihat dari peyebarannya, carbonate disimpulkan sebagai barrier kecil dan lainnya sebagai pitch reef.

TEKTONIK DAN ASPEK KEBENCANAAN DI PULAU SUMATRA Haryanto, Iyan; Irawati, .; Helmi, Faisal; Adhiperdana, Billy G.; Abdurrokhim, .; Natasia, Nanda; Alfadli, Muhammad Kurniawan; Sunardi, Edy
Bulletin of Scientific Contribution Vol 23, No 3 (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.v23i3.68147

ABSTRAKStruktur geologi di Pulau Sumatra dilatarbelakangi oleh tumbukan lempeng miring antara Lempeng India-Australia dengan Lempeng Eurasia. Peristiwa tektonik ini menyebabkan terjadinya tegasan strike slip sehingga pola struktur yang terbentuk di pulau ini didominasi oleh sesar mendatar dan dua diantaranya bersifat regional yaitu Sesar Sumatra dan Sesar Mentawai. Berdasarkan latar belakang tektonik di atas, maka setiap struktur sesar yang memiliki pola yang sama dengan kedua sesar regional di atas, selalu disimpulkan sebagai sesar mendatar juga.Data lapangan menunjukan tidak semua struktur sesar naik berada di dalam zona transpresional dari mendatar regional yang melengkung (bend fault) atau bergeser (steep over) seperti yang terjadi di daerah Bukit Garba, yaitu sesar-sesar naiknya terbentuk langsung oleh tektonik kompresi. Tektonik kompresi juga terjadi di daerah tinggian seperti prisma akresi dan jalur orogenesa yang pembentukannya memerlukan gaya yang besar dan bersifat regional. Secara genetik peristiwa tektonik harus dilatarbelakangi oleh sistem tegasan kompresi dibandingkan strike slip. Namun demikian karena latar belakang tumbukan lempengnya bersifat miring, maka sebagian dari sesar-sesar naik di Pulau Sumatra bersifat oblik yaitu naik mendatar.Kata Kunci: bend fault, orogenesa, pop-up, strike slip, steep over, subduksi miring. ABSTRACTThe geological structure of Sumatra Island is constructed by the oblique collision of the Indo-Australian Plate with the Eurasian Plate. This tectonic occurrence induces strike-slip stresses, resulting in a structural pattern predominantly characterised by strike-slip faults, among which two are regional: the Sumatra Fault and the Mentawai Fault. Based on the aforementioned tectonic context, any fault structure exhibiting a similar pattern to these two regional faults is typically classified as a strike-slip fault.Field observations reveal that not all thrust fault structures are situated within transpressional zones of regionally curved (bend faults) or steepened (steep-over) faults, as observed in the Garba Hills area. These thrust faults are directly formed by compressional tectonics. Compressional tectonics are also active in areas of high elevation, such as accretionary prisms and orogenic zones, whose formation necessitates substantial forces and is of regional extent. Tectonic events, in a genetic sense, are primarily driven by a compressional stress system rather than strike-slip mechanisms. Nevertheless, due to the inclined nature of the plate collision background, some thrust faults on Sumatra Island are oblique, rising horizontally.Keywords: bend fault, orogenesis, pop-up, strike slip, steep over, oblique subduction.

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

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

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

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 Abdurrokhim ⠀ Abdurrokhim, . Adhiperdana, Billy G. Adhiperdhana, Billy Gumelar Adjat Sudradjat -, Adjat Sudradjat Adjat Sudrajat Adsura, Softy Putri Adycipta Anis Prawoto, Adycipta Anis Agung Mulyo Ahmad Helman Hamdani, Ahmad Helman Alvionita, Azizah Tiara Ambari, Wardahrose Dhifa Andriana, Yoga Arifin, Alvin Adam Ayu, Shinta Billy G Adhiperdana Billy G. Adhiperdana Carrisa, Dea Darwansyah, Fiqry Djadjang Jedi Setiadi Dwandari Ralanarko Edison Gunawan Sirodj Emi Sukiyah Eric Wijaya Faisal Helmi Faisal Helmi -, Faisal Helmi Faizal Muhamadsyah -, Faizal Muhamadsyah Fauziely, Lili Ginting, Agus Santa Haqiqie, Fauzan Aditya Hendarmawan, . Heni Pujiastuti Herida, Shaskia Ildrem Syafri Ismawan - Iyan Haryanto Iyan Haryanto -, Iyan Haryanto Iyan Haryanto, Iyan 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 Saputro, Anisa Ayu Saragih, Rahmat Yantono Sendjadja, Yoga Andriana Sentani, Eddy Arus Suparka -, Suparka Suryanegara, Yoga SYABAN, FARHAN TAUFIK Syaiful Alam Vijaya Isnaniawardhani Wardhani, Vijaya Isnania Yarra Sutadiwiria Yeftamikha, . Yoga Andriana Sendjaja, Yoga Andriana Yunita Rossa Indah Putri, Yunita Rossa Yusi Firmansyah, Yusi

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