Reconstruction of floral changes during deposition of the Miocene Embalut coal from Kutai Basin, Mahakam Delta, East Kalimantan, Indonesia by use of aromatic hydrocarbon composition and stable carbon isotope ratios of organic matter

Widodo, Sri; Bechtel, Achim; Anggayana, Komang; Püttmann, Wilhelm

doi:10.1016/j.orggeochem.2008.10.008

Cited by 53 publications

(8 citation statements)

References 69 publications

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“…Especially, Cenozoic coals and coaly sediments have higher potential to generate oil compared to older age counterparts, due to the floral evolution (Petersen and Nytoft, 2006;Petersen et al, 2009). Vegetation differences and deposition changes of coal deposits were investigated using biomarker, aromatic hydrocarbon and carbon isotope composition (Bechtel et al, 2007;Widodo et al, 2009;Zdravkov et al, 2011). Tertiary coal-bearing source rocks of Pinghu Formation in Xihu depression offer an ideal research case for oil generation potential and geochemical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of Tertiary coal-bearing source rocks in Xihu depression, East China Sea basin

Zhu

Zhou

et al. 2012

Marine and Petroleum Geology

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Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of Tertiary coal-bearing source rocks in Xihu depression, East China Sea basin

Zhu

Zhou

et al. 2012

Marine and Petroleum Geology

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“…This interpretation is further supported by the postulated near-shore environment. Low di-/(di-+ triterpenoids) ratios (0.01-0.07) were also detected in middle and upper Miocene coals from the Kutai Basin by Widodo et al (2009). These authors found a positive relation between δ 13 C values (-28 to -27 ‰) and the di-/(di-+ triterpenoids) ratios.…”

Section: Nature Of the Peat-forming Vegetation As Recorded By Geochem...mentioning

confidence: 84%

“…Among terpenoids derived from land plants, sesquiterpenoids of the cadinane type and triterpenoids of the ursane/oleanane type predominate. Cadinanes in present-day peats and Miocene coals in Southeast Asia are related to dammar resin produced by the angiosperm family Dipterocarpaceae, particularly the genus Shorea (e.g., Anderson, 1963;1964;Anderson and Muller, 1975;Esterle and Ferm, 1994;Esterle et al, 1989;Cameron et al, 1989;Page et al, 1999;Wüst et al, 2001;van Aarssen et al, 1990van Aarssen et al, , 1994Widodo et al, 2009;Morley, 2013). A positive correlation between cadinane type sesquiterpenoids and the amount of in-situ resinite (r²=0.63) provides additional support for the presence of dammar resin in the BL1 seam.…”

Section: Nature Of the Peat-forming Vegetation As Recorded By Geochem...mentioning

confidence: 99%

Organic geochemistry and petrography of Miocene ombrotrophic coals in the tropical Asem-Asem Basin (Kalimantan, Indonesia): Comparison to coeval subtropical coals in the Eastern Alps

Fikri

Sachsenhofer

Bechtel

et al. 2023

Austrian Journal of Earth Sciences

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The middle Miocene Warukin Formation in the Asem-Asem Basin (Kalimantan) contains a 20-m-thick coal seam (BL1) that is mined at the Jumbang mine. The seam, formed in a tropical peat, was studied to reconstruct the peat-forming environment and to compare its characteristics with those of similarly aged tropical coals from the Tutupan mine in the Barito Basin (Kalimantan) and similarly aged (~15 Ma) subtropical coal from the Leoben Basin in the Eastern Alps (Austria). Although all coals were formed in ombrotrophic peatlands, the comparison reveals differences in biomarker and maceral composition due to the different climate and flora. The study is based on 22 coal and three non–coal samples, each representing a stratigraphic interval of 0.2 to 1.0 m. The samples were analyzed for ash yield, carbon and sulphur contents, and maceral composition. Organic geochemical parameters were obtained on eight coal samples to obtain information on the peat-forming vegetation. The low-ash, low-sulphur BL1 seam was deposited in an ombrotrophic basinal (coastal) mire. Locally increased sulphur contents in the lower coal bench BL1L demonstrate brackish influence and a near-shore environment. The vegetation was dominated by angiosperms including abundant dammar resin producing Dipterocarpaceae, while the contribution of gymnosperms was negligible. The Tutupan seams T110 and T210, which were formed in kerapah (inland) ombrotrophic mires, have similar ash yields and sulphur contents but contain higher, although still low, concentrations of gymnosperm-derived diterpenoids. In addition, lower amounts of cadinane-type biomarkers and resinite suggest that Dipterocarpaceae were less dominant in kerapah peats. While differences between tropical coals from Kalimantan are minor, major differences exist between the tropical coals and the subtropical ombrotrophic Leoben coal. These include significantly higher concentrations of gymnosperm-derived biomarkers in subtropical peat, lower amounts of resinite due to the absence of Dipterocarpaceae, as wells as lower amounts of leaf- and rootlet-derived macerals. Apparently, fungal activity was also reduced in the sub-tropical Leoben peat. Surprisingly, the average amount of oxidized plant remains is also lower in the subtropical peat.

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“…Coal is usually complex and uneven in structure, so it is difficult to exactly describe its molecular structure. However, the rate of aromatic carbon in coal can be used to describe the basic structural units of coal in terms of the average structure characteristics of carbon atoms (usually, the higher the aromatic carbon rate is, the greater the aromatic carbon content in coal is and the higher the corresponding degree of aromatization is) . Therefore, the aromatic carbon ratio of the coal used in the experiment was calculated in this paper.…”

Section: Results and Discussionmentioning

confidence: 99%

Study on the Differences of Chemical Structures and Pyrolysis Characteristics between the Jurassic and Carboniferous Coking Coals

Zhang

Wang

et al. 2022

ACS Omega

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Using Jurassic coking coals and Carboniferous coking coals as raw materials, carbonization experiments were carried out on the cokes produced by them in a self-made furnace in a laboratory-scale coking furnace, finding that the coke quality of the Jurassic fat coals and coking coals was obviously inferior to that of the Carboniferous coking coals of the same brand. In this study, the reasons for this phenomenon were studied by elemental analysis, Fourier transform infrared spectroscopy analysis, and thermogravimetric analysis of experimental coal samples and by combining the differences in chemical structures of experimental coal samples with pyrolysis characteristic parameters. It was found that the key factor affecting the quality of cokes made from the Jurassic fat coals, coking coals, and highly volatile coking coals was that the coals contained too many oxygen-containing functional groups, which were decomposed into reactive oxygen species in the main pyrolysis stage of coal. These reactive oxygen species would consume too much free-moving hydrogen and then trigger a large number of condensation and cross-linking reactions, resulting in poor plastic mass and coke quality.

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Reconstruction of floral changes during deposition of the Miocene Embalut coal from Kutai Basin, Mahakam Delta, East Kalimantan, Indonesia by use of aromatic hydrocarbon composition and stable carbon isotope ratios of organic matter

Cited by 53 publications

References 69 publications

Geochemical characteristics of Tertiary coal-bearing source rocks in Xihu depression, East China Sea basin

Geochemical characteristics of Tertiary coal-bearing source rocks in Xihu depression, East China Sea basin

Organic geochemistry and petrography of Miocene ombrotrophic coals in the tropical Asem-Asem Basin (Kalimantan, Indonesia): Comparison to coeval subtropical coals in the Eastern Alps

Study on the Differences of Chemical Structures and Pyrolysis Characteristics between the Jurassic and Carboniferous Coking Coals

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