#TITLE_ALTERNATIVE#
Barumun sub basin is the northernmost Cenozoic trough in Central Sumatra Basin and is located in southern of Asahan High. Newly acquired deep targeted 3D seismic data from exploration activity of Chevron open a new horizon to the basin especially in understanding Pematang Group syn rift stratigraphy...
Saved in:
| Main Author: | |
|---|---|
| Format: | Theses |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/13214 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Barumun sub basin is the northernmost Cenozoic trough in Central Sumatra Basin and is located in southern of Asahan High. Newly acquired deep targeted 3D seismic data from exploration activity of Chevron open a new horizon to the basin especially in understanding Pematang Group syn rift stratigraphy and Paleogene rift geometry. Barumun sub basin is believed as a product of pull apart situated in wrench tectonic regime in a dextral shear couple. The objective of this research is to understand the basin development and the role of tectonic driven structuring in controlling basins erchitecture and depositional system. 2D and 3D seismic mapping using seismic stratigraphy is the main tool in revealing the geometry of basin, relationship of each sedimentary package as basin fill and relative age determination. Isopach map is used to infer minimum accumulative accommodation space developed during basins live. Depositional setting interpretation is calibrated using well control which penetrated the majority of the investigated sedimentary packages. Some seismic attributes also extracted to be used to help define the geometry of sedimentary facies. It is postulated that Barumun sub basin has two different basins history and actually based by an older basin that is thought to be at least Eocene or older. The younger rift basin is inferred to be Eocene-Oligocene in age filled with Pematang stratigraphic group. The development of Eocene Oligocene rift basin has gone through several stages. Real pre rift sedimentary sequences were not observed except the older basins sediment fill as the base of Eocene Oligocene rift. Rift initiation came in slow pace so did the rate of sedimentation therefore resulted in seismically un mappable rift initiation stratigraphic record. Rate of subsidence grown rapidly toward stage of early maximum rift, while sedimentation rate was still low, so then starved basin was occurred. Maximum rift stage shown by the greatest subsidence rate then decreased substantially in late maximum rift stage. The early post rift identified by reduced or no fault activities led to very low subsidence toward late post rift when the basin actually died out in about Late Oligocene. Subsequent regional uplift followed by regional transgression transformed the basin into marine depositional setting in Early Miocene. Basin overprinting and the dynamic of extension due to intermittent strike slip movement in a multiple border fault basin system had composed a unique and dynamic thus complex structures and stratigraphics interaction during the live of Barumun sub basin. A comprehensive understanding of basins development and its history is essential in evaluating petroleum potential of Barumun sub basin. |
|---|