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All Journal Journal of Earth and Marine Technology (JEMT) Berita Sedimentologi
Maulia, Dita
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation

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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.
Macrofossil Characteristics and Bathymetric Environment of Sumber Makmur Village, Muara Sahung, Kaur, Bengkulu Maulia, Dita; Idarwati, Idarwati
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4651

Abstract

The research location is administratively located in Sumber Makmur Village, Muara Sahung District, Kaur Regency, Bengkulu Province. In the study area, outcrops that had fossils were found, which were shown by the presence of carbonate rock lithology. The study was conducted to determine the deposition environment in the research area. The method used is a previous literature study that aims to determine the physical geological conditions and regional stratigraphy of the research area. Furthermore, field observations and laboratory analysis were conducted in the form of paleontological analysis to determine the characteristics and types of fossils found in the study area. Paleontological research was conducted on two formations, namely the Lemau Formation and the Simpangaur Formation. In the Lemau Formation, several species of benthic foraminifera were found, namely Cibicides praecinestus, Elphidium macelium, Marginopora vertebralis, Elphidium articulatum, and Planorbulina mediterranensis. Then, in the Simpangaur Formation, several species of benthic foraminifera were found, namely Streblus beccari, Bolivina schwageriana, Anomalinella rostrate, Cibides praecinestus, Cibides margaritiferus, Lagena sulcata, Quinqueloculina bradyana, and Lenticulina calcar. In addition, macrofossils were found in marine life with phylum mollusks such as Lunatia elevatum, Murex vanuxemi, Turritella terebra, Conus sauridens, and Plocostoma neumayeri. Based on these data, it can be interpreted that the depositional environment in the study area is in the Transition-Edge Neritic marine environment.
Co-Authors Idarwati Idarwati