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Berita Sedimentologi
Published by Forum Sedimentologiwan Indonesia
ISSN : 08539413     EISSN : 2807274X     DOI : https://doi.org/10.51835/bsed
Core Subject : Science,
Earth & Planetary Sciences
BERITA SEDIMENTOLOGI aims to disseminate knowledge on the field of sedimentary geology to its readers. The journal welcomes contributions in the form of original research articles, review articles, short communications and discussions and replies. Occasionally, Berita Sedimentologi also includes field trip reports and book reviews, which are published only after going through peer-review processes. The main geographical areas of interest are Indonesia and SE Asia, however contribution from the rest of the world is also welcome. Berita Sedimentologi covers broad topics within sedimentary geology, particularly on depositional processes and their records in the rocks, petrology, sedimentology and stratigraphy of both siliciclastic and carbonate rocks; sequence stratigraphy, paleontology, biostratigraphy and sedimentary geochemistry. The journal also accepts articles on interdisciplinary research in sedimentary basin analysis, including large-scale basin geodynamics processes, mechanism of sedimentary basin formation, earth surface processes, sediment routing systems, petroleum geoscience and applied sedimentary geology analysis for mining and engineering geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 2 Documents
 1 
Search results for , issue "Vol 38, No 1 (2017)" : 2 Documents clear
Basin with Multiple Sediment Sources: Tectonic Evolution, Stratigraphic Record and Reservoir Potential of the Bunguran Trough, South China Sea John Jong; Steven M. Barker; Franz L. Kessler; Tran Quoc Tan
Berita Sedimentologi Vol 38, No 1 (2017)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (13262.258 KB) | DOI: 10.51835/bsed.2017.38.1.89

Abstract

The Bunguran Trough is an intra-continental pull-apart basin located in the deepwater domain of the Rajang/West Luconia Delta province, offshore Sarawak. The area evolved as a tectonically-induced sag basin, where the two major lineaments, the Baram Line and the Red River Fault, appear to coalesce to form a major releasing fault bend. Its oldest stratigraphy was formed by shelf clastic deposits of the Late Oligocene Cycle I, Gabus Formation of the Natuna Basin, now buried to a depth of more than 7,000m. The Neogene clastics deposited above are of neritic and bathyal characters. The Early Miocene Cycles II/III, Arang Formation equivalent, consist of shallow marine to slope deposits, and are overlain by base-of-slope to very distal muddy sediments equivalent to Cycle IV and younger Terumbu and Muda formations. All sedimentary units, apart from the youngest Holocene section were subjected to deformation by a variety of tectonic drivers at distinct intervals.Investigation of the Late Oligocene to present-day palaeogeographic evolution of the Natuna and offshore Sarawak regions, in conjunction with a study of the Plio-Pleistocene deformation history and the corresponding sedimentation rates in the Bunguran Trough reveal the following sediment source patterns:The Natuna contributed medium to mostly fine-grained feldspatic and quartz-rich turbidite deposits.Fine sand and silt-rich deposits reached the Bunguran Trough from the fringes of the Rajang (or West Luconia) Delta. The advancing delta front generated turbidite currents running dominantly north to northeast. These clastics can be characterised as mud-rich, with channelised, and highly sinuous geometries accompanied with lobate turbidite deposits having higher sand potential.A minor amount of sediment might have been derived from localised sources in the Dangerous Grounds/North Luconia and Central Luconia Platform areas to the north and east, respectively.From Oligocene to Early Miocene times, sediments were probably sourced from the Natuna Arch/Terumbu Platform areas, but during the Neogene sediment supply shifted to the Rajang Delta in the south. In the Pliocene the Natuna area became important again, as demonstrated by mineralogy and recently acquired 2D/3D seismic data. In addition, the semi-quantitative analysis of the sedimentation rates showed that the rates were low before 3Ma, increasing in the Late Pliocene, and peaking in the Pleistocene. Physical compaction is thought to have played a key role in this trend, in addition to the increased sediment supply from the Natuna Arch.This sequence stratigraphic and sediment compositional study suggests that the Late Miocene to Pleistocene (post-Mid Miocene Unconformity) intervals of the Bunguran Trough consist of predominantly deepwater slope to basinal deposits including turbidites, mass transport deposits, gravity flows and hemipelagic mudstones. Recent exploration well results suggest that sediment provenance from the Natuna Arch provided siltier material with some calcareous content, while the Rajang Delta provided very fine-grained material with very little sand. The quality and distribution of reservoir sand remain the main exploration risk in the Bunguran Trough, largely due to the fine-grained argillaceous nature of the predominant Rajang Delta source.
Seismic Expression of Key Geological Features in the East Natuna Basin Herman Darman
Berita Sedimentologi Vol 38, No 1 (2017)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3426.342 KB) | DOI: 10.51835/bsed.2017.38.1.90

Abstract

The East Natuna Basin is located in the southern tip of the South China Sea. It is separated from the West Natuna Basin by a basement high called the Natuna Arch. The Bunguran Trough bounds the eastern side of East Natuna Basin from Sarawak Basin, offshore East Malaysia. The northern part of the East Natuna Basin has similar geological setting with the Nam Con Son Basin, offshore Vietnam.Petroleum exploration activity in this area is relatively low in comparison to it is in the West Natuna Basin. In 1973, Agip discovered Natuna D-Alpha gas field in the East Natuna Basin. The field contains more than 200TCF of gas, but unfortunately, the gas has 71% CO2. Recently, Premier Oil successfully tested the synrift play in the north of the region by drilling Kuda Laut-1 (2014) and then followed it up in the same year with drilling Singa Laut-1. The results also proved equivalent synrift play in the north within Vietnamese waters. A younger clastic play in the south of the East Natuna Basin was already proven earlier in 2012, by Black Platinum Energy (BPE) as a result of the Dara-3 and 4 drilling campaign.This article presents a summary of seismic sections published in the area with interesting geological features such as carbonate build-ups, synrift fault blocks and relatively simple anticlinal features at younger intervals. Other potential hydrocarbon accumulations are also discussed here.

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