EVALUASI PALINSPATIK DAN MEKANISME PERANGKAP HIDROKARBON LAPANGAN NORTHEAST BETARA, JAMBI SUMATERA SELATAN

• Main Author: EKAYANTI, NELLI
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/14353
• Institution: Institut Teknologi Bandung

Tectonic history of South Sumatra Basin has been well understood. These considerations encompas regional aspects which aplicable for basin-scale understanding. Episodes of tectonics within the basin have been established. Most of the understandings have been based on regional data covering gravity, seismic and well. More detailed coverage of study, including field-scale evaluation however, is necessary to conduct to examine structural traps which hopefully can contribute to new petroleum discoveries.<p>On this study, structural grains of the Northeast Betara Field were identified using seismic and well data. The evaluation structurally restored the Northeast Betara Field to several periods to examine the origin and evolution of the structure and their related trap mechanism. Palinspatic restoration was selected as the method for reconstructing the structure. Using this method and its evaluation, potential structural traps on each tectonic period can be identified and these paleo-traps may contribute for future petroleum potential of the North East Betara Field.<p>The field is fragmented into several blocks by local structural grains. The evaluation was conducted on each structural block. Restoration was selected on each top of rock formation identified on 2-D seismic sections controlled by several wells. The sections are southwest-northeast trending, crossing the field and the Betara Deep to the east.<p>Palinpastic reconstruction show that the structural deformation of the Northeast Betara Field evolved from extensional rifting, forming half-graben system, through right-lateral (dextral) strike-slip faulting to inversion structures. Trapping hydrocarbon started after inversion at post-rift sediment.<p>The influence of extension which causes elongation or shortening horizon that causes contraction intensified visible horizon to the southeast, are shown in the graph the average extension and the greatest shortening found in the seismic cross-section located at the southeast on this research. This suggests that the tectonic forces that cause the extension and shortening comes from the southeast.