Mineralogy, petrography, and Rock-Eval pyrolysis of late Oligocene coal seams in the Malkara coal field from the Thrace Basin (NW Turkey)

Karayi̇ǧi̇t, Ali̇ İhsan; Oskay, Rıza Görkem; Çelik, Yakup

doi:10.1016/j.coal.2021.103814

Cited by 17 publications

(10 citation statements)

References 82 publications

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“…(ii) Rock-Eval T max may be sensitive to kerogen type, the presence of H-rich vitrinite/huminite, and thermal maturation (Espitalié, 1986;Peters, 1986;Petersen, 2006;Vu et al, 2013;Carvajal-Ortiz and Gentiz, 2015;Hazra et al, 2017;Yang and Horsfield, 2020;Karayigit et al, 2021). The oil window for kerogen Type I has a narrow range of T max values (in general from 440 to 450 °C; Bordenave et al, 1993), while that for kerogen Type II has a wider range (~435-475 °C) at the same maturity (Dembicki, 2016).…”

Section: Hydrocarbon Generation Potentialmentioning

confidence: 99%

“…Dembicki, 2009;Carvajal-Ortiz and Gentiz, 2015;Yang and Horsfield, 2020). For instance, the presence of secondary organic matter (solid bitumen, pyrobitumen), which can be the dominant form of organic matter present in thermally mature shales (Sanei et al, 2015;Hackley and Cardott, 2016), may affect Rock-Eval parameters, as in some cases may the presence of hydrogen-rich vitrinite/ huminite (Petersen, 2006;Vu et al, 2013;Hazra et al, 2017;Yang and Horsfield, 2020;Karayigit et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Palynofacies and Organic Geochemistry of Lacustrine Source Rocks: The Potrerillos – Cacheuta Source Rock System in the Triassic Cuyo Basin, West‐central Argentina

Pineda,

Comerio,

Ottone

et al. 2023

Journal of Petroleum Geology

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This study presents an integrated investigation of the Upper Triassic Potrerillos – Cacheuta lacustrine source rock in the Cuyo Basin of western Argentina. Data came from palynofacies analyses, organic petrography, Rock‐Eval pyrolysis and mineralogical studies based on X‐ray diffraction analyses. An 80 m thick outcrop section was studied and is interpreted to represent the transition from shallow‐lacustrine sediments influenced by fluvial discharges (uppermost Potrerillos Formation) to the deposits of a deep, permanent lake (Cacheuta Formation). Three palynofacies were defined. Palynofacies I is characterized by shallowing‐upward cycles with abundant woody material, and was deposited under an oxic, disturbed water column. Palynofacies II and III occur in laminated shales rich in amorphous organic matter (AOM) and freshwater algal material (Botryococcus) respectively, which were deposited under oxygen‐depleted conditions. In general, the detrital material present suggests an input derived from fluvial discharges; however, interbedded tuffs altered to analcime and smectite suggest the transformation of vitric material in pyroclastic ash under saline to alkaline water conditions. Kerogen Types II/III and III with high total organic carbon values indicate a moderate oil‐ and gas‐prone source rock whose thermal maturity varies from immature to the early oil window (Tmax: 430‐438 °C; vitrinite reflectance: 0.59‐0.67 % VRo; and thermal alteration index: 2‐2+).This study demonstrates the importance of palynofacies analyses for the interpretation of depositional changes and associated controls in lacustrine shale successions. When integrated with data from organic geochemistry, palynofacies analysis is an important tool in the evaluation of a source rock's thermal maturity and hydrocarbon generation potential.

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Section: Hydrocarbon Generation Potentialmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Palynofacies and Organic Geochemistry of Lacustrine Source Rocks: The Potrerillos – Cacheuta Source Rock System in the Triassic Cuyo Basin, West‐central Argentina

Pineda,

Comerio,

Ottone

et al. 2023

Journal of Petroleum Geology

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“…On the one hand, terrigenous clastic minerals can cause the degradation of organic matter [10,92,93]. On the other hand, clay minerals, in coexistence with organic matter, are the main components of oil shales, and clays are also very good adsorbers of organic matter [94,95] and have an influence on TOC content and Rock-Eval pyrolysis parameters [96][97][98][99]. Therefore, cross plots of TOC content versus terrigenous detrital minerals (Figure 11a) and clay mineral content (Figure 11b) were drawn, but no clear correlations could be identified.…”

Section: Controlling Factors On Oil Shale Qualitymentioning

confidence: 99%

A Comparative Study of Different Quality Oil Shales Developed in the Middle Jurassic Shimengou Formation, Yuqia Area, Northern Qaidam Basin, China

et al. 2022

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Oil shales are developed in the Shale Member of the Middle Jurassic Shimengou Formation in the Qaidam Basin, China. The oil shales can be classified into three quality groups (low-, medium-, and high-quality oil shales) through a comprehensive analysis protocol that includes Rock-Eval pyrolysis, total organic carbon (TOC) content, proximate analysis, gas chromatography-mass spectrometry (GC-MS), X-ray diffraction (XRD), major and trace element analyses, and maceral analysis. The low-quality oil shales mainly contain type II1 kerogen, the medium-quality oil shales mainly contain type I-II1 kerogen, and the high-quality oil shales mainly contain type I kerogen. All are immature to early thermally mature. The oil yield of the oil shales is directly related to their quality and are positively correlated with TOC content and calorific value. All studied samples were deposited under anaerobic conditions but in different paleoenvironments. The low-quality oil shales were mainly deposited in fresh-water environments, whereas the high-quality oil shales were usually developed in highly saline and reducing environments. Salinity stratification and evidence of algal blooms that are conducive to organic matter enrichment were identified in both medium- and high-quality oil shales, the latter having the highest paleoproductivity and the best preservation conditions. In summary, shale quality is controlled by a combination of factors, including algal abundance, preservation conditions, the existence of algal blooms and salinity stratification, and paleoproductivity. This study reveals how these different factors affect the quality of oil shales, which might provide an in-depth explanation for the formation process of lacustrine oil shales.

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“…Rock-Eval pyrolysis parameters can be used to evaluate the types of organic matter in shale. Nevertheless, Rock-Eval pyrolysis parameters may be affected in some cases due to mineralogical compositions and certain kerogens [26][27][28][29][30][31][32]. Therefore, it is necessary to use a variety of experimental parameters to study the types of organic matter.…”

Section: Types Of Organic Mattermentioning

confidence: 99%

Geochemical Features of Lacustrine Shales in the Upper Cretaceous Qingshankou Formation of Changling Sag, Songliao Basin, Northeast China

Bao

Wei

et al. 2022

Energies

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The organic-rich shale of the Upper Cretaceous Qingshankou Formation is an important hydrocarbon source rock in Northeast China. In this study, taking the lacustrine shale in the Qingshankou Formation as an example, geochemical analysis, including total organic carbon (TOC), Rock-Eval pyrolysis, maceral compositions, X-ray diffraction (XRD), and biomarker analyses, were carried out on twenty-four shale samples to evaluate the geochemistry and environmental features of this shales. The Qingshankou lacustrine shales contains mainly Type I/II1 organic matter and is oil prone, with a good to excellent source rock. Vitrinite reflectance and Rock-Eval pyrolysis parameters show that the Qingshankou lacustrine shales is mainly in the mature stage and within the oil window. Biomarker composition of the shales provide evidence that the Qingshankou lacustrine shales was formed in a reductive sedimentary environment with relatively high salinity water. The organic matter came from a mixture of plankton, bacterial and land plants.

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Mineralogy, petrography, and Rock-Eval pyrolysis of late Oligocene coal seams in the Malkara coal field from the Thrace Basin (NW Turkey)

Cited by 17 publications

References 82 publications

Palynofacies and Organic Geochemistry of Lacustrine Source Rocks: The Potrerillos – Cacheuta Source Rock System in the Triassic Cuyo Basin, West‐central Argentina

Palynofacies and Organic Geochemistry of Lacustrine Source Rocks: The Potrerillos – Cacheuta Source Rock System in the Triassic Cuyo Basin, West‐central Argentina

A Comparative Study of Different Quality Oil Shales Developed in the Middle Jurassic Shimengou Formation, Yuqia Area, Northern Qaidam Basin, China

Geochemical Features of Lacustrine Shales in the Upper Cretaceous Qingshankou Formation of Changling Sag, Songliao Basin, Northeast China

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