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Journal : Journal of Geoscience, Engineering, Environment, and Technology

Provenance Analysis Based On Petrographic Samples On EXIA-1 Well, Banggai Basin, East Sulawesi, Indonesia Setyawan, Reddy; Aribowo, Yoga; Kurniasih, Anis; Fahrudin; Ali, Rinal Khaidar; Najib; Ferdy; Wijaya, Ennur Kusuma; Qadaryati, Nurakhmi; Khorniawan, Wahyu Budhi; Dalimunte, Hasnan Luthfi; Ringga, Anita Galih
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.2.13367

Abstract

The structure of Exia is composed of Miocene built-up carbonates formed by shear faults. The buildup carbonate feature in the Exia prospect can be seen from the high elevation surrounded by lows with an NNE-SSW and NE-SW trending. The MA-1, SE-1, MI-1 wells are several wells in the Tiaka and Senoro Fields which are proven to have large gas reserves. Tiaka Field is located to the west of the Exia Well, while Senoro Field is to the northeast. The study used primary data from the Exia-1 well in the form of cutting samples. The wet and dry cutting samples were further processed into thin section. This thin section is then carried out for petrographic, XRD, and SEM analysis. Tomori Formation starts from the deeper environment FZ1 upwards to the shallower FZ5 –FZ6 (reef) with open marine and restricted areas. The allochem that composes the limestone at The Matindok Formation consists of red algae fragments and benthic forams which indicate the facies zone of formation in FZ 4 (slope). In the upper Mantawa Formation, it is still quite clear the presence of large forams indicating a reef association environment (FZ5-FZ6), but the presence of a large number of planktonic forams indicates a deeper depositional environment / slope, so it is possible that large forams were transported from a shallower environment. The Kintom Formation have rock provenance ranging from continental blocks in the interior of the craton to a recycled orogeny section of recycled quartz zone.
Review: Geological Structure impacts to hydrocarbon potential and active faults in the East Java Basin, Indonesia Fahrudin; Yoga Aribowo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.16736

Abstract

Review of the geological structure patterns in the East Java Basin (EJB) to understand the geodynamics has implicated to the hydrocarbon potential and active faults. However, the impact of those structures on hydrocarbon potential and active faults is unclear. This study reviewed structure patterns using surface and subsurface data, GPS, seismicity and tremors in the East Java Basin, Indonesia and Nankai Trough, Japan. In EJB, Indonesia, the tectonic setting is constrained by the Rembang Fault. The north of the Rembang Fault, the pattern exhibits NE-SW structures, while to the south, it shows W-E structures. The results indicate that the upper crust (including ophiolitic basement) has greater density to the north than to the south. Thus, vertical motion of the crust is more dominant than lateral motion to the north of the Rembang Fault. This vertical motion may trigger the reactivation of the Meratus Fault (weak zone or as active fault) located on the northern platform (e.g., the Bawean earthquake on March 22, 2023). Conversely, to the south of the Rembang Fault, there is a significant hydrocarbon potential associated with W-E structures. Those structures could form by subduction and collision tectonic. Similary, tectonic backstop may account for presence of structures in Nankai Trough, Japan.
Active Tectonics of the Garsela Fault Utilizing Morphotectonics and Seismicity in Garut Regency, Indonesia Pristiwantoro, Rafa Nurul Zahra; Fahrudin; Widiarso, Dian Agus; Moechtar, Rio Alcanadre Tanjung; Cita, Akbar
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.20209

Abstract

Tectonic activity along active faults in Indonesia has a high potential to cause earthquakes with magnitudes greater than 6.5. This research focuses on the Garsela Fault in Garut Regency, West Java, which has a history of shallow earthquakes occuring near nationally important infrastructure. Morphotectonic analysis, Maximum Credible Earthquake (MCE) calculations, geological structure measurements, and subsurface condition assessments were conducted to determine the tectonic activity around the Garsela Fault and its fault mechanism. The analysis results show that tectonic activity in Garut Regency ranges from low to high. The Garsela Fault is divided into two segments with different fault systems: the Rakutai Segment, a normal fault (16.22 km), and the Kencana Segment, a strike-slip fault (17.33 km). MCE calculations for the Garsela Fault indicate potential maximum magnitudes of 5.42, 5.54, 6.28, and 6.54. Shallow earthquakes may produce stronger tremors in the western part of the Rakutai Segment compared to the east. In addition, earthquakes originating from the Kencana Segment may also generate tremors in the southern part of Garut Regency.
Co-Authors Abadi , Agung Prasetyo Adnan Zufar Haqiqi Agung Wibowo Aldy Kusuma Aliza Nuralma Althearae Nira Septin Andi Hasliyati Ike Safitri, Idris Sodikin Anggi Afrina Rambe Anton Azis, Dul Baiq Najwa Tiara Safitri Bambang Ismaya Budhi Martana Chairul Adhim Cita, Akbar Dahlan Dalimunte, Hasnan Luthfi Damora Rhakasywi Daud Em Paulia Dewanto, Ramadhan Haryo Diah Yudhawati Diharto Dikdik Fauzi Dermawan Ega Trisna Rahayu Eko Budi Santoso Ernawati, Neneng Eva Aprilia Cahya Ningsih Fadila, Salwa Nur Fauziah, Nadila Nurul Ferdy Fitria Zulhaedar Fresa Dera Ramdani Gustiawati, Resty Haerudin Hidayat, Vicky Rosyid Hukmah, Safiroh I Gusti Made Kusnarta Julkifli Kamil, Acep Bahrum Kurniasih, Anis L. Sukardi, L. Lailatus Syarifah Ledi Diana Agustin M. Rachman Waluyo M. SALEH Mansyur Srisudarso Mansyuri, M. Ikhwan Maulita, Sintia Putri Moechtar, Rio Alcanadre Tanjung Muhammad Mury Syafei Muhammad Naufal Bari Muhammad Rasyiid Wijaya Mulya, Viona Santi Mulyati Mulyati Musafir, Musafir Najib Naufal Rifki Abibreza Noviyanti, Eka Listia Nugroho, Setio Nurfajriah Padusung Pramono, Setio Pramuswara, Novita Andika Pristiwantoro, Rafa Nurul Zahra Qadaryati, Nurakhmi Rahardja, Muhammad Nurfaizi Arya Rangga Saputra Rasidi, Moh. Regita Ayu Dwietama Rika Wirasaputri Rinal Khaidar Ali Ringga, Anita Galih Riski Hidayah Rizki Amelia Rosali Sembiring Samsudin Santika Sari Savanti, Fisa Setyawan, Reddy Setyowati, Wiwit Silvia Anggraeni Soca Ar Rantisi solihah, raidatus SRI RAHAYU Sri Wahyuni Sukartono Suprananto2 Supriandi Suwardji Syahra, Aodien Syahra Maharani Tajidan, Tajidan Takyun Tazra Fiddinnia Robin Titin Sugianti Titing Suharti Tutik Handayani Ummi Kulsum Wahyu Budhi Khorniawan Wibowo, Ardiyan Adhi Widiarso Dian Agus Wijaya, Ennur Kusuma Yanti Triguna Yoga Aribowo Yoga Aribowo Yoma Hatima Zuhdiyah Matienatul Iemaaniah