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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 282 Documents
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A proposed model of Width-Thickness Ratio for tidal shelf sand ridge reservoirs within Upper Cibulakan Fm. in the Ajata Field, Offshore Northwest Java Basin Dani Setiawan, Priantoro Kartika; Amrizal, Amrizal; Setiawati, Yasinta Dewi; Mansur, Achmad
Berita Sedimentologi Vol 49, No 3 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.49.3.442

Abstract

The Upper Cibulakan reservoir of the Ajata Field in the Northwest Java Basin represents tidal shelf sand ridges deposited in an open-mouthed shallow marine environment. One hundred fifty-three wells have been drilled to develop this reservoir since 1970. The average density of wells in the Ajata Field is 400-500 m, making it an ideal case for reconstructing tidal shelf sand ridges reservoir model. This study aims to determine tidal shelf sand ridges heterogeneity and geometry, especially through width-thickness ratio, in the Ajata Field and to identify similar reservoirs in other fields or basins. The data used in this study are 900 ft conventional core data, 74 Routine Core Analysis (RCA) data, 152 well logs, and 3D seismic data.Tidal shelf sand ridges conventional cores analysis shows six lithofacies in the Upper Cibulakan Formation, namely: claystone-siltstone, lenticular siltstone, flaser sandstones, cross-bedded sandstones, non-calcareous massive sandstones, and calcareous sandstones. These six lithofacies are grouped into four facies associations and they reflect the tidal shelf ridge development stages: embryonic, immature accretion, mature accretion, and abandonment. These facies associations create a cyclicity pattern bounded by chronostratigraphic markers of marine flooding surfaces. Well-to-well correlation and seismic interpretation results show several trends and geometry of the tidal shelf sand ridges. Three zones of width thickness ratio (W-T) analysis in every parasequence are concluded in this study: Zone I (width: maximum 800 m; thickness: less than 25 ft), Zone II (width: 700 – 1300 m; thickness: 25 – 45 ft), and Zone III (width: 1000 – 1900 m; thickness: thicker than 45 ft).
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.
When, how much, how fast, and why it matters; a quantitative view of stratigraphy and the emergence of a new paradigm Lunt, Peter; Luan, Xiwu
Berita Sedimentologi Vol 49, No 3 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.49.3.431

Abstract

Our understanding of the regional geology of SE Asia appears to have stagnated and, to break out of this state, a new approach to stratigraphic studies is required. We must avoid the trap of deductive studies and boilerplate formats as these restrictive methods of investigation rely heavily on assumptions that are not valid in the tectonically active basins of the region. This review examines an alternative workflow that replaces model-based methods with evidence-based ones, and in particular uses stratigraphic properties in a quantitative way to test old concepts. Through this approach a tectono-stratigraphic framework is established, and new data is used to test and then build upon this interdisciplinary framework. It is argued that only this approach can accommodate and predict the unique and locally complex geology of the region. A key component of this approach is the now stable, cross-facies, biostratigraphy, and time scale for the later Eocene to Recent of SE Asia, as well as methods in estimating paleo-bathymetry. These can be used to evaluate the sedimentary history and structural evolution of the basins, using geohistorical analysis.The application of this quantitative approach, combined with a more open attitude to sub-surface data from government authorities, makes it highly probable that there will be a paradigm shift in our understanding of regional geology across SE Asia. Examples given here illustrate the use of the quantitative methods in rejecting long-established and widely cited old ideas, and the start of building of new concepts. We have not yet arrived at the new paradigm, but we can already observe that the attenuation of Sundaland, with two separate axes of extension, both with simultaneous episodes of movement, is not consistent with any current plate tectonic hypothesis, or even any known plate mechanism. The new framework is argued to be both innovative and predictive, replacing the largely descriptive and enervated role of geology in the past few decades. A new, evidence-based role will offer a better understanding of facies palaeogeography through time and exploration risks.
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
Cretaceous-Paleogene rifting on the NW margin of the Australian continent, SE Banda Arc region Charlton, Timothy
Berita Sedimentologi Vol 49, No 2 (2023)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2023.49.2.437

Abstract

The Banda Terrane successions of Timor Island and correlative units in Sumba are widely considered allochthonous with respect to the Australian continental margin successions that form the main part of the Banda arc-continent collision complex. A new interpretation is proposed for the Banda Terrane, which suggests that these units originated on the outermost (northern) edge of the Australian continent. Volcanic successions in the Banda Terrane, which date to the Cretaceous and Paleogene (Aptian/Albian to Eocene), are interpreted as originating in a backarc/marginal basin setting behind a northward-facing arc that rifted away from the NW margin of Australia through this period. The Banda terrane successions are interpreted as representing the southern, continent-attached portion of the marginal basin, and occupied a position on the distal edge of Australia up to the onset of Banda arc-continent collision in the Miocene.Supporting evidence for an Australian margin origin of the Banda Terrane includes very similar age ranges for zircons dated to the Cretaceous in Sumba and Timor (Banda Terrane) and in sandstones of the Ungar Formation in Tanimbar, the latter forming an element of the Australian margin succession. In Timor there is also previously reported evidence for continental margin rifting during the Late Cretaceous, while contemporaneous Late Cretaceous-Paleogene volcanism is also recognised in the Bird’s Head-Misool region of eastern Indonesia, which forms part of the Australian continental margin. In addition, a number of stratigraphic links between the Banda Terrane and the Australian continental margin successions in Timor are summarised in this study.The effects of the Cretaceous-Paleogene rifting event are also apparent in subsidence curves derived from petroleum exploration wells drilled on the northern ‘passive’ continental margin of Australia from SW of Timor to the Bird’s Head-Misool region of eastern Indonesia. Inferred rift-related subsidence commenced in the Aptian-Albian on the Australian palaeo-margin immediately east of Timor and developed sporadically but in regionally consistent groupings throughout the Late Cretaceous and Paleogene.
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.
Lithofacies interpretation and depositional model of Talangakar Lacustrine Deposits: A Study in the Ardjuna Field, Eastern Sunda Basin Ismanto, Aviandy Widya; Feraldo, Ridho; Akbar, Afriyan; Suhartomo, Herry; Hasani, Nurul; Musakti, Oki Trinanda; Wasonoaji, Andi; Saputra, Lulus Ilmiawan
Berita Sedimentologi Vol 49, No 3 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.49.3.441

Abstract

The Ardjuna Field in the Northwest Corner (NWC) block is located on the eastern side of Sunda Basin and is adjacent to the Seribu Fault. Producing reservoirs in the Ardjuna Field are mainly of the Talangakar (TAF) fluvio-deltaic sandstones, however all wells within the four production platforms of the field had been shut in November 2006. Hence it is necessary to re-evaluate remaining potential and to seek new reservoirs within the field in order to reactivate oil and gas production from the structure.The main focus of our study is to evaluate the remaining potential of TAF fluvio-deltaic producing zones and identify new potential in the TAF lacustrine deposits. We used a total of 8 exploration wells, 17 development wells, and a 3D seismic dataset during our evaluation. Out of the 25 wells, only two wells have penetrated the lacustrine deposits interval, i.e. W-1 and S-5 wells. The S-5 well proved flowing HC of up to 1,043 MMCFGPD and 332 BOPD from DST.The lower TAF lacustrine deposit is characterized by the occurrence of typical freshwater pollens, displaying a serrated and coarsening upward log pattern, thin succession, and absence of sediment structures. Seismic interpretation and Acoustic Impedance (AI) analysis indicate that low AI value ( 7200 gr/cc*ft/s) correlate with high porosity, interpreted as sandstone. The AI-guided seismic attribute reveals a relatively regular lobate shape resembling a fan measuring 1.7 km by 2.5 km. Furthermore, low AI values are more prevalent and widely distributed, particularly on top of the closure.
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.
Carbonate shoal microfacies characterization using the interdependent of depositional systems and diagenesis of Kais Formation in the Matoa Field, Salawati Basin Ontosari, David; Hafeez, Al; Setyadi, Abdul Latif
Berita Sedimentologi Vol 49, No 2 (2023)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2023.49.2.438

Abstract

Matoa Field in the Salawati Basin, Papua, Indonesia was discovered in 1991. Oil production commenced in 1993, yielding a cumulative production of more than 21 MMBO by 2015. In the latest POD that was approved in 1999 and was valid until 2019, it was recommended to drill six additional wells within three integrated structures. By 2018, a static model was built, incorporating present-day island analogues and the latest interpretation from reprocessed 3D seismic data, paleontological data, and petrographic analyses. The latest static model renews the understanding on reservoir characteristics (geometry and microfacies) for the purpose of further field development.  This paper discusses field analogues in correlation with an interplay of carbonate depositional environment with diagenetic evolution in the Matoa Field. Three candidates for possible present-day analogues of Matoa Field were screened i.e., Java Sea’s Thousand Islands, Kapoposang Islands of Spermonde Archipelago, and the Great Barrier Reef of Australia. The objective was to improve understanding of the conceptual geological model in the regional sense. Based on palaeogeomorphology (morpho-arrangements, shelf geometry and sedimentary architecture), the present-day Central Reef Zone of Wet Tropic at the Great Barrier Reef is fit to be utilized as an analogue to the continental, Miocene Salawati carbonate complex.  Well-tied 3D seismic data, from which several multiple attributes were analysed, have been reprocessed twice. Attributes such as RMS Amplitude, realized RMS Amplitude, Sweetness and Relative Acoustic Impedance were analysed and extracted to understand the diagenetic features of Matoa Carbonate reservoir. The result shows that RMS Amplitude, in combination with petrographic – paleontological data, exhibits the most likely attribute to characterize sedimentology and top diagenetic picks of the carbonates.  It is concluded from four reservoir zones in Matoa’s static model, that present-day analogues and distinct interplay among lithology, depositional and diagenetic systems are key aspects to revise the development strategies. The most significant interdependent factors can be quantitatively measured and modelled, such as the dual porosity system which was synthesized by Phi separate vug from the RFN Lucia porosity model.
Indonesian Stratigraphic Lexicon: Past, Present and Future Darman, Herman; Permana, Asep; Syavitri, Dewi
Berita Sedimentologi Vol 49, No 3 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.49.3.444

Abstract

The Stratigraphic Lexicon is an important source of regional geological information. Due to the development of the science and the geological understanding, the lexicon needs to be updated. Following the first Indonesian Stratigraphic Lexicon by Marks (1957), Harahap et al. (2003) made an update to the lexicon. The latter version was later published online as a website. A GIS format of the lexicon will soon be available for geoscientists to use. This paper also provides suggestions for improving the lexicon, which includes the preparation of logs type for each section. A systematic approach to periodically ever greening the lexicon is necessary. The Geological Survey of Indonesia and the Indonesian Association of Geologists should be involved in the future improvement of the lexicon.

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