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Berita Sedimentologi
ISSN : 08539413     EISSN : 2807274X     DOI : https://doi.org/10.51835/bsed
Core Subject : Science,
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.
Articles 6 Documents
Search results for , issue "Vol 50, No 1 (2024)" : 6 Documents clear
New Understanding of the Mesozoic Tectonostratigraphy of Eastern Indonesia Siregar, Parvita H.; Panggabean, Hermes; Sebayang, Deddy A.
Berita Sedimentologi Vol 50, No 1 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.50.1.459

Abstract

The tectonic history of Eastern Indonesia has been a major interest since the successful hydrocarbon discoveries within the Mesozoic section in the Northwest Shelf of Australia, Timor Sea (Abadi Field), Bintuni, Berau and Seram. There have been numerous studies to understand the complex tectonic history and stratigraphy of the area. Sequence stratigraphic approach has proven to be the only effective method to unravel this vast area and this paper attempts to put previous studies and findings in perspective.  Furthermore, this paper proposes a regional tectonostratigraphic chart to be utilized, hopefully, as a tool to work on underexplored Pre-Tertiary stratigraphic sections of Eastern Indonesia.The geology of Eastern Indonesia started with the separation of microcontinents from Gondwanaland in the Late Paleozoic, including fragments rifting and drifting from the Australian Continental Margin during the Mesozoic. Three major megasequences were identified and are related to the fragmentation of the Australian Continental Margin, which consist of Pre-rift, Syn-rift and Post-rift megasequences. The timing of each megasequence was different, especially between the southern area (Timor Sea, Abadi-Tanimbar and West Arafura area) and the northern area (Aru-Kumawa, Bintuni, Berau, Semai and Papua). The northern area was separated from the Australian mainland by Middle-Late Triassic, while the southern area separated from the Australian Continent by Late Jurassic. This implies that the syn-rift sediments in the north-eastern Indonesia are older (Late Permian-Triassic) than those to the south (Early Triassic-Late Jurassic). In other words, same-aged formation in the north is genetically different from the southern part of the area.  As an example, the Jurassic reservoir sands at Bintuni Basin belong to a different megasequence than the Jurassic sands in the Timor Sea and Tanimbar area.  The syn-rift reservoirs in Bintuni Basin remain underexplored.The new tectonostratigraphic chart and proposed paleo-depositional environment hopefully brings clarity and efficiency for hydrocarbon exploration in the area.
Front Matter Berita Sedimentologi Vol.50 No.1 Nugraha, Abang Mansyursyah Surya
Berita Sedimentologi Vol 50, No 1 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.50.1.464

Abstract

Front Matter Berita Sedimentologi Vol.50 No.1
Neogene Coal Characteristics and Depositional Environments in the Kikim Area of South Sumatra Basin; Insights from logging, proximate test, sulfur test and electrofacies Idarwati, Idarwati; Maulia, Dita
Berita Sedimentologi Vol 50, No 1 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.50.1.460

Abstract

Neogene coal is the main producer in the Kikim area (Gumay Talang District, Lahat Regency) of South Sumatra Basin and is part of the Muaraenim Formation. However, the characteristic and depositional environment of this Neogene coal are still poorly understood. This research was conducted to determine the characteristics and distribution model of coal seams, as well as its depositional environment. Coal seam characteristics include thickness, description, coal rank, depositional structure, and coal seam depositional environment. The methods used in this research are well-logging, proximate and ultimate tests, and electro facies. Geophysical logging analysis was carried out at four drilling points. The results of the analysis from well logging found four seams in order from youngest to oldest seam, namely seam B, seam C, seam D, and seam E. Seam B has the most significant thickness, namely 9.55 meters, Seam C 2.29 meters, seam D 4.90 meters and Seam E 2.10 meters. The ASTM classification shows that the coal seam is included in the coal rank Sub-bituminous B – Sub-bituminous A. The determination of coal rank uses the ASTM D-388 classification, which aims to identify the coal grade. The parameters used in determining coal rank are fixed carbon content, calorific value, and volatile matter. The depositional structure found at the research location is split. The depositional environment interpretation of coal seams uses three parameters lithofacies, sulphur content and electro facies. Our research revealed that the study area's depositional environment is in the upper delta plain in the backswamp-floodplain section.
Sedimentary facies and depositional environments of the Halang Formation in the North Serayu Basin: Insights from outcrop study in Bantarbolang, Pemalang, Central Java Barizi, A.R. Falkhan; Prasetyadi, Carolus; Janukusuma, Miftakhuddin A.S.; Setiawan, M. Nurjati
Berita Sedimentologi Vol 50, No 1 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.50.1.447

Abstract

Halang Formation has been the subject of extensive research due to its unique characteristics, particularly its turbidite facies, which indicate deposition in deep marine environments. Previous studies have revealed a complex lithological composition, including sandstone, calcareous sandstone, claystone, marl, tuff, and breccia, with an upward coarsening pattern indicative of progradation processes. The presence of Bouma’s sequence further confirms the dominance of turbidite deposits within the formation. This research aims to define the depositional environment of the Halang Formation through detailed lithofacies and microfossil analyses, focusing on a previously understudied area in the North Serayu Basin. By integrating data from field observations and micropaleontological analysis, this study seeks to provide valuable insights into the sedimentary processes and paleoenvironments that formed the Halang Formation. Our findings indicate that the formation was deposited in a submarine fan environment, specifically in the smooth portion of suprafan lobes, which are characterized by dominant classical turbidite (CT) facies. Micropaleontological analysis suggests an inner to outer bathyal environment at depths ranging from 283.65 to 713.7 meters. These results contribute to our understanding of the Halang Formation depositional history and the broader geological evolution of the North Serayu Basin.
Microfacies and paleodepositional setting interpretation of the latest Oligocene to earliest Miocene Carbonate of Citarate Fm., Bayah High, West Java Hainim, Iwan
Berita Sedimentologi Vol 50, No 1 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.50.1.451

Abstract

Four hundred and ten samples were collected from carbonate outcrops of Citarate Formation in the Bayah High area, west of Pelabuhan Ratu, West Java. Petrographic analysis reveals 14 carbonate microfacies distributed in the study area, which include: (1) Globigerinid wackestone-packstone, (2) Foraminiferal bioclastic packstone-grainstone, (3) Foraminiferal algal packstone-grainstone, (4) Benthic foraminifera-rich grainstone, (5) Red algal foraminifera packstone, (6) Globigerinid bioclastic packstone, (7) Coralline algal packstone-boundstone, (8) Branching coral packstone-grainstone, (9) Foraminifera coralgal packstone-grainstone, (10) Platy coral foraminiferal algal packstone-grainstone, (11) Intraclast/plagioclase-rich packstone-grainstone, (12) Massive coral boundstone-rudstone, (13) Platy coral bioclastic packstone-grainstone, and (14) Platy coral boundstone grainstone.Micropaleontological analysis of the carbonate microfacies reveals age distribution ranging from P22, N4, to younger than N4 (Blow’s Zonation), and Te4 (Adam’s letter stage), which are equivalent with the latest Oligocene to very Early Miocene Epoch.Detailed stratigraphic observation from outcrops and micropaleontological analysis show a north-south carbonate trend. This trend happened to superimpose the structural lineaments of Bayah High. It is interpreted that a shallow depositional environment developed in the western part and became deeper towards the east.This paper is part of a study of Oligo-Miocene carbonates and their relationship to tectonic events in West Java. By knowing the evolution of Oligo-Miocene carbonate rocks and their relationship with the tectonic development of West Java, it is possible to interpret the presence of these carbonate rocks below the surface for hydrocarbon exploration purposes.
Late Jurassic and Early Cretaceous Radiolarian Age Determinations from Timor-Leste Munasri, Munasri; Charlton, Timothy Richard; Guterres, Maria; Gandara, Dino
Berita Sedimentologi Vol 50, No 1 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.50.1.455

Abstract

Two new sets of palaeontological age determinations based on radiolaria are reported from Timor-Leste. The first is from the Suai Loro-1 petroleum exploration well, located near Suai town in SW Timor-Leste, drilled by Timor Oil in 1971. Newly rediscovered ditch cutting samples from the previously undated basal section of this well have yielded radiolarians of Late Jurassic (middle Oxfordian to middle Kimmeridgian) age. On lithology, this stratigraphic interval of reddish shales and interbedded limestones is assigned to the Tchinver Formation.A second set of radiolarian determinations is from samples collected in the Caraulun river south of Samé town in south-central Timor-Leste. These are dated to the Early Cretaceous (late Valanginian-Hauterivian). The outcrop succession of radiolarian cherts, sandstones and red shales are assigned to the Wai Bua Formation as defined in East Timor (Timor-Leste), which is equivalent to the Nakfunu Formation in Indonesian West Timor.

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