GEOLOGI BAWAH PERMUKAAN DAN POTENSI PEMBENTUKAN SISTEM PETROLEUM PADA AREA BUNGALUN KARIORANG, CEKUNGAN KUTAI, KALIMANTAN TIMUR

• Main Author: Alfian Nur Rachman, Bintang
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/33631
• Institution: Institut Teknologi Bandung

Kutai Basin is tertiary basin in Indonesia which known as prolific hydrocarbon area. This study focus on Bungalun Kariorang Area, the northern part of basin known as Northern Kutai Basin, which bound by Sangkulirang Fault Zone in the north east – north and Schwaner Mountains and Adang Fault Zone in the south west – south. The purpose of this study is to map the subsurface configuration and to restore its seismic sections aimed to understand structural evolution which develop in study area. Potential analysis of petroleum generating system was also conducted qualitatively in the study area. Hydrocarbon potential observed in Eocene to Miocene stratigraphy units. Formations interval in the study area consist of Sembulu, Kariorang, Maluwi, and Sekerat Formations. Data used in the study are wireline log data, 2D seismic sections, core description, and biostratigraphy data. Methods used for analysing geological feature consist of subsurface map analysis, sections restoration, and depositional environment analysis. The results show that the study area is affected by two tectonic regimes, they are extensional and contractional regime. Extensional regime occured first and generated rifting which last from Middle Eocene to Late Oligocene. And then contractional regime occured and activated structural features in basement and created strike slip faults which intersect extensional faults lineament. Contractional regime occured more intensively in Middle Miocene thus generated inversion faults which originated from faults in early rifting phase. The study area has petroleum system potential elements which consist of source rocks, reservoir rocks, and seal rocks and it formed hydrocarbon traps which dominated by structural kind of traps. The petroleum system has been occuring from Eocene age until now.