Climatic control on primary productivity changes during development of the Late Eocene Kiliran Jao lake, Central Sumatra Basin, Indonesia

Widayat, Agus Haris; Schootbrugge, Bas van de; Oschmann, Wolfgang; Anggayana, Komang; Püttmann, Wilhelm

doi:10.1016/j.coal.2016.08.008

Cited by 15 publications

(5 citation statements)

References 36 publications

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“…The significance levels of n-alkanes ranging from C21-C38, with Cmax at 31 and strong odd carbon number predominance in Perkasa Inakakerta, Borneo coal sample reflect the co-dissolved epicuticular wax from the source plants [8]. The existence of long-chain nalkanes indicates the source of coal organic compounds originated from terrestrial higher plants, including Duri oils [13,26,27], brown coal from Sangatta, coal mines, East Kalimantan [19], Brown Shale Formation, Kiliran sub-basin, Central Sumatra Basin [28,29]. The very low abundance of short and medium n-alkane chains indicates the low contribution of bacteria, algae, and plankton in the formation of coal organic compounds, Brown Shale, Central Sumatra Basin, [29][30][31], coal deposits of the Far East [32].…”

Section: N-alkane Biomarkersmentioning

confidence: 98%

Origin and Maturity of Biomarker Aliphatic Hydrocarbon in Wondama Coal Indonesia

et al. 2020

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Organic geochemical characterization of Wondama coal samples from the Lengguru Folding Belt has been carried out through the study of its aliphatic hydrocarbon biomarkers. This study is to determine the origin, depositional environment and maturity of coal which is useful for determining the use of coal as an energy source. Aliphatic hydrocarbon biomarkers were identified by using gas chromatography-mass spectroscopy methods which showed the presence of n-alkane homologs (n-C15 - n-C33), which was dominated by n-C31. This indicates that the organic material originates from Angiosperms of terrestrial higher plants. The ratio of pristane to phytane (Pr/Ph) with value of 3.74 indicates that the Wondama coal is buried in an oxic depositional environment. The Carbon Preference Index (CPI) value of 7.82 and the C31αβS/(S + R) ratio of 0.27 indicate low maturity of Wondama coal and is classified into a sub-bituminous coal ranks.

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Section: N-alkane Biomarkersmentioning

confidence: 98%

Origin and Maturity of Biomarker Aliphatic Hydrocarbon in Wondama Coal Indonesia

et al. 2020

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“…The quarry samples belong to the Kiliran Jao/Pematang Formation of the Kiliran Jao Sub-basin (e.g., Iqbal et al, 2014;Sunardi, 2015;Widayat et al, 2016) and the Sumatran highway samples belong to the Sangkarewang Formation of the Ombilin Sub-basin (e.g., Koesoemadinata and Matasak, 1981). We classify samples of the Kiliran Jao Formation based on their lithofacies into mudstone (MDS), massive mudstone (MAS), papery laminated shale (PAP; Widayat et al, 2016), sandy mudstone (SDM), and sandstone (SST). Meanwhile, for the Sangkarewang Formation, we refer to them as SKR-1 and SKR-2 based on their location.…”

Section: Surface-outcrop Samplesmentioning

confidence: 99%

Mechanical properties of Indonesian organic-rich shales from the Central Sumatra and North Sumatra Basin, and comparison with US shales

Lanin,

Sone

2024

Preprint

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Mechanical characterization of shales is a fundamental requirement in optimizing shale resource development and transferring development strategies between shale plays. Here we report the laboratory-based mechanical properties of Indonesian shale potentials located within Tertiary basins in active margin settings. Samples from surface-outcrops of lacustrine sediments in the Central Sumatra Basin (CSB) and subsurface-cores of marine deposits in the North Sumatra Basin (NSB) were examined in a series of experiments for their mechanical properties including rock strength, elastic properties, and creep compliance. Results show that the Indonesian shales studied here are generally more compliant than Mesozoic/Paleozoic U.S. shales reported in the literature. Within the context of a binary mixture model (stiff and soft components) used to explain shale elastic properties, these differences in mechanical properties imply that the soft and stiff end-members are more compliant in Indonesian shales. We interpret these differences as the difference in mechanical maturity, which reflects the degree to which mechanical properties have evolved due diagenesis. CSB and NSB samples are considered to be early mature, mechanically, compared to the mechanically mature U.S. shales. Particularly, the Baong Formation samples from the NSB studied here come from a hard-overpressured interval and are mechanically immature, despite their moderate thermal maturity based on vitrinite reflectance. Laboratory results also show no significant differences in mechanical properties between shales deposited in lacustrine (CSB samples) and marine (NSB samples) environments.

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“…For the depositional time slice of the Lower Schöneck Formation, bottom water anoxia was probably induced by salinity stratification. However, at the same time the supply of the re-mineralized nutrients to the sea surface, particularly nitrate and phosphate in dissolved form, would have been strongly hindered by the halocline (Widayat et al, 2016), and thus the primary productivity also decreased significantly.…”

Section: Toc Enrichmentmentioning

confidence: 99%

Factors controlling the petroleum generation characteristics of Palaeogene source rocks in the Austrian Molasse Basin as revealed by principal component analysis biplots

Yang

Schulz

2019

Marine and Petroleum Geology

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After Rock-Eval & TOC screening and heterogeneity evaluation on 91 Palaeogene source rock samples from a well drilled in the Austrian Molasse Basin, ten shale samples were selected for detailed investigations by means of pyrolysis-gas chromatography, bulk kinetics and biomarker identification and quantification. Afterwards, 2-D biplots based on principal component analysis were applied to unravel the palaeo-environmental control on the development of petroleum source rocks. All samples are immature source rocks with good petroleum generation potentials. The redox environment during deposition was generally reducing, and palaeosalinity is suggested to be the main factor causing the differences in organic carbon contents among the samples. The hydrogen index values, the gas generation preferences and the aromaticity of the products are controlled by both depositional environment and precursors, and the product of a salinity indicator (MTTC) and the oleanane index is introduced as predictive proxy to evaluate these features. The maturity indicator (Tmax) is revealed as dominated by the stability of the kerogen structure which is controlled by the proportion of organic sulphur compounds in the kerogen. The global Eocene-Oligocene climate change from a greenhouse to an icehouse world is suggested to play an important role in changing the palaeoenvironment and further in influencing the development of petroleum source rocks by triggering upwelling, increasing the palaeo-sea water salinity and decreasing the deposition of carbonate-minerals. The chemometric method suggested here acts as a powerful tool in identifying the controlling factors for the petroleum generation potential among many variables, and can be applied more widely in petroleum geology when multi-parameters are involved to get quick and meaningful correlations.

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Climatic control on primary productivity changes during development of the Late Eocene Kiliran Jao lake, Central Sumatra Basin, Indonesia

Cited by 15 publications

References 36 publications

Origin and Maturity of Biomarker Aliphatic Hydrocarbon in Wondama Coal Indonesia

Origin and Maturity of Biomarker Aliphatic Hydrocarbon in Wondama Coal Indonesia

Mechanical properties of Indonesian organic-rich shales from the Central Sumatra and North Sumatra Basin, and comparison with US shales

Factors controlling the petroleum generation characteristics of Palaeogene source rocks in the Austrian Molasse Basin as revealed by principal component analysis biplots

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