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All Journal Bulletin of Scientific Contribution : Geology Indonesian Journal of Applied Sciences IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Journal of Engineering and Technological Sciences Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) BULLETIN OF THE MARINE GEOLOGY Buletin Sumber Daya Geologi Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan KURVATEK Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Locus Penelitian dan Pengabdian Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Geosciences and Applied Geology
Ildrem Syafri
Faculty Of Geological Engineering, Padjadjaran University, Jatinangor, 45363, West Java, Indonesia
Aerospace Engineering Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Mathematics Physics Social Sciences

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THE IMPACT OF TOTAL MOISTURE AND ASH ON CALORIFIC VALUE: COAL RESEARCH IN BERAU SUB-BASIN, EAST KALIMANTAN Sugiarto, Wahyu; Muljana, Budi; Syafri, Ildrem; Rizal, Yan; Prasetya, Muhammad Nurul Huda
KURVATEK Vol 10 No 1 (2025): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v10i1.5519

Abstract

Coal quality is one of the key factors in determining the effectiveness of processing and utilization. Coal quality assessment involves analyzing physical and chemical aspects to determine its characteristics. Coal quality is also influenced by geological conditions at the mining site, which affect the quality and amount of carbon in the coal. To ensure consistency, it is necessary to implement coal quality control based on physical and chemical parameters from the mining process in the pit to storage in the stockpile. Analysis of the effect of total moisture and ash on the calorific value of coal is the purpose of this study. The method used is a ROM (Run of Mine) coal sample located at the stockpile location. The relationship between Total Moisture and the calorific value of coal shows a negative linear correlation where the influence value for a 1% increase in Total Moisture is -71.343 kcal/kg and so is between Ash and the calorific value of coal 1% increase in Ash is -82.588 kcal/kg, which shows a negative linear correlation. Total Moisture increases by 1%, reducing the calorific value of coal by 71 kcal/kg, and increasing Ash content by 1% reduces the calorific value of coal by 83 kcal/kg.
Ichnofossil of Nanggulan Deltaic System: Case Study of Watupuru Cross Section in Kulon Progo, Central Java, Indonesia Nuraini , Siti; Syafri, Ildrem; Muljana, Budi; Sudradjat, Adjat
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.295-312

Abstract

The Nanggulan Formation in Kulon Progo, Yogyakarta, Indonesia, is rich in ichnofossils as observed in a cross-section of the Watupuru River. This research aims to explore the relationship between ichnogenera, their behaviours and patterns during the deposition of the Nanggulan Formation in the Middle to Upper Eocene period. The study involved analyzing measured sections along the Watupuru River, paleocurrent measurements, and palynology. Seventeen ichnogenera were identified and linked to seven depositional facies within the Nanggulan Formation, i.e. Nummulites bank, prodelta, strand plain, delta front, delta plain, sandflat, and fluvial sand, categorized into autochthonous and allochthonous rock units. Allochthonous rocks, like tempestite and turbidite, were discovered within the autochthonous Nanggulan Formation with ichnogenera present in both types of rocks. Ichnofossils associated with the prodelta facies in autochthonous rocks included into Bergaueria, Siphonichnus, Phycodes, Trypanites, Treptichnus, Teredolites, Chondrites, and Thalassinoides, tend to indicate a muddy suspension environment. In contrast, the delta plain facies (FDP) indicating a calm oxidizing environment with ichnogenera contents like Teredolithes, Bergaueria, Scoyenia, Aulichnitus, Helminthopsis, Chondrites, Gastrochaelites, Ophiomorpha, and Siphonichnus were recognized. Factors influencing ichnofossil diversity include lighting, behaviour or adaptation to the environment, sedimentation rate, current control, and burrow infilling. The diversity of ichnofossils in allochthonous tempestite layers was influenced by post-catastrophic storm events. Barren ichnogenera at the base of tempestite layers indicated early storm surges, while the upper layers contained diverse ichnogenera such as Gastrochaelites, Psilonichnus, Bergaueria, and Planolites in the delta front facies (FDF). Tempestite layers in the sandflat facies (FSF) containing ichnogenera such as Thalassinoides, Bergaueria, Rhizocoralleum, Planolites, Cylindrichnus, and Siphonichnus, tend to show a favorable environment for organism post-storm.
Secondary Enrichment of REE in Weathered Granite, South Bangka, Indonesia Tampubolon, Armin; Syafri, Ildrem; Rosana, Mega Fatimah; Yuningsih, Euis Tintin
Indonesian Journal on Geoscience Vol. 11 No. 1 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.1.141-165

Abstract

Rare earth elements (REEs) are essential materials for the manufacture of advanced technology. Secondary REE indications were found in alluvial and lateritic tin deposits within Southeast Asia Tin Belt. This study aims at the REE enrichment of weathering profiles underlain by Toboali Pluton of the main range S-type granite of this belt. Granite and weathering samples were collected and analyzed using XRF, ICP-MS/OES, XRD, SEM-EDX, and EPMA. The Chondrite-normalized REE patterns of granite in Toboali showed enrichment in REE with the highest value of 1,126 ppm. The Toboali Pluton is enriched in LREE and depleted in HREE. The enrichment of REE from the upper to lower horizon of weathering profiles was pointed out by the increase in REE values from a range of 156-188 ppm (horizon B) to 196-268 ppm (horizon C) in Toboali, and from a range of 230-330 ppm (horizon B) to 342-450 ppm (horizon C) in Air Gegas. These coincided with the presence of kaolinite with elevated REE and CeO2 in horizon C of weathering profile. Leaching test result proved that kaolinite plays a role in REE enrichment in the weathering profile through ion adsorption mechanisms in the Air Gegas. The weathering process of REE fluoro-carbonate (bastnäsite-(Ce)) and parisite-(Ce) in granite is believed to contribute in enrichment due to its high dissolution rate, which enhances kaolinite adsorption. In contrast, REE phosphates such as monazite-(Ce) and xenotime-(Y), because of their strong resistance and low solubility, are thought to be only slightly soluble, and most of these minerals remain in Toboali weathering products.
Enhanced 3D Seismic Image Resolution by Applied Attributes for Improved Carbonate Reservoir Characterization in Karawang Region, North West Java Sudarsana, Muhammad Rizki; Syafri, Ildrem; Agus Nur, Andi; Abdurrokhim, Abdurrokhim
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.401-412

Abstract

The study focuses on the enhancement of 3D seismic data to improve the interpretation of carbonate growth phases within Middle Miocene limestone formations in the Karawang region, north west Java. By applying a sequential workflow of various seismic attributes, including the second derivative, phase shift, frequency filter, structural smoothing, and iterative trace Automatic Gain Control (AGC), the vertical resolution of seismic events is significantly improved, from an initial dominant frequency of 22 Hz (38 m tuning thickness) to a final effective dominant frequency of 33 Hz after all enhancements. These enhancements facilitate a clearer delineation of stratigraphy, depositional patterns, and the geometry of carbonate growth cycles. The integration of well data, including wireline logs and synthetic seismograms, with enhanced 3D seismic sections provides a comprehensive understanding of subsurface features and porosity development in the target area. The enhanced data enabled the identification of four distinct carbonate growth phases, revealing complex thickness variations and depositional architectures controlled by sea-level fluctuations. This integrated approach demonstrates the critical role of optimized seismic attribute application for detailed carbonate reservoir characterization and optimizing well placement for hydrocarbon exploration and exploitation.
TIPE INTERVAL T2- HUMMOCKY PADA ENDAPAN BADAI (TEMPESTIT), FORMASI NANGGULAN, PEGUNUNGAN KULON PROGO, YOGYAKARTA Nuraini, siti; Syafri, Ildrem; Muljana, Budi; Sudradjat , Adjat
KURVATEK Vol 10 No 2 (2025): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v10i2.5800

Abstract

The composition of storm deposit layers (tempestites) is described as a normal sedimentary deposit or fining upward-deposit, divided into 3 units: the lower part, the middle part, and the upper part. The lower part is characterized by coarse clastics, the middle part known as T2 consists of a combination of hummocky and swalley layers containing finer clastics with good sorting. The upper part shows deposition of layering in increasingly calm current conditions with fine clastics: clay. The T2 interval is often considered a characteristic of turbidite deposit models due to gravity flow. However, on the other hand, the nature of storm-induced currents (hummocky-swalley) is more varied due to the role of 3 controlling currents: oscillatory currents, bottom currents, and combined currents. This study will investigate the characteristics of storm interval T2 (tempestites) in the Nanggulan Formation. The method applied is to generate stratigraphic sections for 3 sections (Kali Clumprit, Watupuru, and Songgo), age correlation and of paleocurrents analysis. Storm deposits are found in the Middle Eocene-aged Nanggulan Formation, showing a polymodal direction with opposing and branching within T2 interval. This pattern reflects two opposing directions: bottom currents and storm oscillatory currents. On the other hand, a combination current emerges, branching off from the main current pattern. The T2 Watupuru layer consists of overlapping hummocky layers that extend in a northwestward direction, indicating an ancient coastal or land area.
Co-Authors A. Sudradjat A. Sudradjat A. Sudradjat Abdurrokhim ⠀ Abdurrokhim, . Achmad Noerkhaerin Putra Adi Hardiyono, Adi Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudrajat Adjat Sudrajat Agus Didit Haryanto Agus Didit Haryanto -, Agus Didit Haryanto Agus Nur, Andi Agustiany, Irfani Agustina Djafar Agustinus, Eko Tri Sumarnadi Ahadi Ahmat Lamburu Ahmad Luthfi Aini, Hana Nur Almun Madi Amitama, Emilia Bunga Andi Agus Nur Andi Agus Nur, Andi Agus Antonius Bambang Yuniarto -, Antonius Bambang Yuniarto Aprillia, Belinda Rizka Ardiansyah, Reza Asep Mohamad Ishaq Shiddiq Aton Patonah Aton Patonah, Aton Awaludin, Winarno Benyamin Benyamin Benyamin Benyamin, Benyamin Benyamin, Benyamin Bonar Tua Halomoan Marbun Brian Christiantoro Budi Muljana Budiadi, E. Christiantoro, Brian Denis, Mutebi Deny Setiady Djadjang Jedi Setiadi Djajang Sukarna E. T. Paripurno E. T. Paripurno Eko Tri Sumarnadi Agustinus Eko Tri Sumarnadi Agustinus Electricia, K.S. Elfitra, Dhanu Embara, Patra Emi Sukiyah Emy Sukiyah Euis Tintin Yuningsih Euis Y. Yuningsih, Euis Y. Evaristus Budiadi F. G, Aiwoy Fachrudin, Kurnia Arfiansyah Fadhly, Ahmad Febri Hirnawan Febriwan Mohamad, Febriwan Febriwan Mohammad, Febriwan Febyani, Siska Firman Herdiansyah, Firman G. Hartono G. Hartono Ginanjar, Asep Hadian, Muhamad Sapari Dwi Hadian, Muhamad Sapari Dwi Hana Morina, Hana Hananto kurnio Hartawi Riskha Hartawi Riskha, Hartawi Hartono, G. Hartono, Udi Haryadi Permana Hastowo Resesiyanto Hendarmawan Hendarmawan Hendarmawan Hendarmawan, Hendarmawan Heri Hermiyanto Zajuli, Heri Hermiyanto Hermes Panggabean Hermes Panggabean Herry -, Herry Hilarius Rodriguez Hilarius Rodriguez, Hilarius Hill Gendoet Hartono Hutabarat, Johannes ilmi, irpan Iqbal Ramadhan, M. Iqbal, M. Irzon, Ronaldo Irzon, Ronaldo Iskandar Zulkarnain Ismawan Ismawan Ismawan Ismawan, Ismawan Iwan Setiawan Johanes Hutabarat Johanes Hutabarat Johannes Hutabarat K, Mohammad Fatahillah Pradana Kapid, Roebiyanto Kurnia Arfiansyah Kurnia Arfiansyah, Kurnia kurnio, Hananto kurnio, Hananto Lia Jurnaliah Lili Fauzielly M. Iqbal M. Iqbal Manwarjit, Manwarjit Marbun, Bonar Tua Halomoan Mayasari, Verna Mega F. Rosana, Mega F. Mega Fatimah Rosana Mega Fatimah Rosana Mega Fatimah Rosana Moeh. Ali Jambak Moeh. Ali Jambak, Moeh. Ali Moh. Heri Hermiyanto Zajuli Moh. Heri Hermiyanto Zajuli Muhamad Sapari Dwi Hadian Muhammad Kurniawan Alfadli Muhammad Zulfikar Muhammad Zulfikar Nana Sulaksana Nana Sulaksana Nana Suwarna Nana Suwarna Nana Suwarna Nanda Natasia Nazar Nurdin Noor Cahyo Dwi Aryanto Noor Cahyo Dwi Aryanto Novianti Wahyuni Purasongka, Novianti Wahyuni Nuarihidayah, Gilang Diesty Nugroho, Sigit Dwi Nuraini , Siti Paripurno, E. T. Petra Wattimury Prabowo, Arief Prasetio, Rasi Prasetio, Rasi Prasetya, Muhammad Nurul Huda Purnama Sendjaja Purnama Sendjaja Puspita, Ramelia Eka Rahmola, Wiryadi Rizkiputra Ralanarko, Dwandari Ramzis, Novaldo Rasi Prasetio Resesiyanto, Hastowo Reza Ardiansyah Reza Ardiansyah Rivaldy, Mohammad Rodriguez, Hilarius Roebyanto Kapid Ronaldo Irzon Ronaldo Irzon Ronaldo Irzon Rosana, Mega Fatimah Rosana, Mega Fatimah Rosana, Mega Fatimah Rusman Rinawan -, Rusman Rinawan Satrio Satrio Satrio, Satrio Satrio, Satrio Sendjaja, Purnama Sendjaja, Purnama Sendjaja, Purnama Shaska Zulivandama Shiddiq, Asep Mohamad Ishaq Siti Nuraini SUBAGJA, MUHAMAD AGAM Suci Sarah Andriany, Suci Sarah Sudarsana, Muhammad Rizki Sudradjat , Adjat Sudradjat, A. Sudradjat, A. Sudradjat, Adjat Sudradjat, Adjat Sudrajat, Adjat Sugianto, Asep Sulaksana, Nana Suwarna, Nana Swasty Aninda Piranti Syaiful Alam Syaiful Bachri Tampubolon, Armin Taufan, Yoqi Ali Udaya Kamiludin Udi Hartono Udi Hartono Vijaya Isnaniawardhani Viqnoriva, S.N. Wahyu Sugiarto Wattimury, Petra Wiguna, Purwa Wilda Aini Nurlathifah Winantris Winantris Winarti Winarti Yan Rizal, Yan Yoga Andriana Sendjaja, Yoga Andriana Yogi Fernando, Yogi Yudi Darlan Yusriyah, Dzakiyah Zakaria, Firman Zarkasyi, Ahmad Zulfialdi Zakaria, Zulfialdi Zulkarnain, Iskandar ⠀, Abdurrokhim ⠀, Winantris