Organic geochemistry of kerogen from La Luna Formation, Western Venezuelan Basin, using diffuse reflectance – Fourier transform infrared spectroscopy (DRFTIR)

César, Jaime; Quintero, Karla

doi:10.1016/j.fuel.2020.118805

Cited by 13 publications

(4 citation statements)

References 24 publications

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“… 38 In addition, The peak at 695 cm –1 may have the contribution of the external deformation vibration of C–H in substituted benzene. 39 The aliphatic hydrocarbon stretching bands of CH 2 and CH 3 are observed at 2923 and 2851 cm –1 , respectively. 40 The peak at 1455 and 1375 cm –1 are attributed the deformation vibration peaks of methylene (−CH 2 −) and the flexural vibration of methyl (−CH 3 ), respectively.…”

Section: Resultsmentioning

confidence: 97%

“…Among them, 470, 695, 777, 798, 1037, and 1080 cm –1 are derived from the vibration of Si–O bond in quartz and feldspar . In addition, The peak at 695 cm –1 may have the contribution of the external deformation vibration of C–H in substituted benzene . The aliphatic hydrocarbon stretching bands of CH 2 and CH 3 are observed at 2923 and 2851 cm –1 , respectively .…”

Section: Resultsmentioning

confidence: 99%

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Study on Pyrolysis Kinetics, Behavior, and Mechanism of Organic-Rich Tuffaceous Mudstones Based on Thermogravimetric Analysis

Li,

Zhou,

et al. 2023

ACS Omega

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Organic-rich tuffaceous mudstones are important oil and gas resources. The systematic study of the pyrolysis kinetics and characteristics can not only provide the theoretical basis for the rational development and efficient utilization of these rocks but also is an important complement to the theoretical research on the pyrolysis kinetics of organic-rich rocks. In this study, the pyrolysis kinetics, behavior, and mechanism of the organic-rich tuffaceous mudstone in the Junggar Basin were clarified by thermogravimetric analysis. The organic structure and mineral composition were identified by Rock-Eval, Fourier transform infrared (FTIR), and X-ray diffraction (XRD). The results indicated that the mudstone could be described as a type II kerogen with good hydrocarbon generation potential. The mudstone included up to 80.7% quartz, which is associated with Carboniferous volcanic activity. Four isoconversional methods were used to evaluate the activation energies. A novel and simplified method was proposed to separate the pyrolysis processes using the Coats−Redfern method based on the differences in reaction models and activation energies. The pyrolysis processes were divided into four stages, and the reaction models of each stage were preliminarily clarified. The reaction models were further modified by the accommodation function The results showed the kinetic parameters, and the reaction models of each stage were significantly different. Moreover, the obtained kinetic parameters and optimal reaction models can well characterize the pyrolysis processes and mechanism of the tuffaceous mudstone. The results of thermogravimetric-FTIR (TG-FTIR) indicated that the main pyrolysis hydrocarbon volatiles were methane, C 2+ aliphatic hydrocarbons, and aromatics. And the types and yields of pyrolysis volatiles differed at each stage.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Study on Pyrolysis Kinetics, Behavior, and Mechanism of Organic-Rich Tuffaceous Mudstones Based on Thermogravimetric Analysis

Li,

Zhou,

et al. 2023

ACS Omega

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“…Throughout hydrothermal transformations, a notable shift occurs in the structural group composition of OM. We utilized FTIR spectroscopy to examine the structural and group composition of the samples, a method widely praised by researchers for its reliability and efficiency. − Many scientists emphasize the advantages of FTIR spectroscopy, including its ability to rapidly identify functional groups, its nondestructive nature, and its ease of operation, making it an invaluable tool in analytical chemistry and material science.…”

Section: Resultsmentioning

confidence: 99%

Structural Alterations of Oils and Domanic Shales During Supercritical Water Injection

Kiselev,

Feoktistov,

Onishchenko

et al. 2024

Energy Fuels

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Shale oil is a complex organic rock in which kerogen serves as the main source for obtaining liquid hydrocarbons. Traditional methods of light oil extraction prove to be inefficient due to their low bitumen content and high extraction costs. This stimulates the need for the development of new, efficient, and environmentally friendly technologies for the extraction and processing of shale oil. This article proposes a method of hydrothermal conversion of Domanic shale in subcritical and supercritical fluids at various temperatures (300, 350, and 400 °C). Analysis methods include SARA analysis, gas chromatography, GC/MS of saturated and aromatic fractions, IR spectroscopy, Xray tomography of rocks, and others. The results confirm changes in the composition and structure of shale, including hydrocarbon redistribution, changes in resins and asphaltenes, and heterogeneous changes in pore space. These data reveal the influence of hydrothermal conversion of Domanic shale, opening new perspectives for understanding and optimizing the processes of synthetic oil production.

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“…A variety of chemical methods, including Fourier transform infrared spectroscopy (FTIR), 13 C NMR, Raman spectroscopy (RS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), have been broadly utilized to obtain structural parameters of kerogen in different hydrocarbon generation stages. − For these experimental methods, 13 C NMR and FTIR are the most versatile and effective tools. Since carbon atoms are the most important part of the kerogen structure, 13 C NMR can reveal the bond environment and linkage of the aliphatic/aromatic carbon groups as well as their subgroups. ,, FTIR is another useful technique for providing parameters for the relative content of distinct functional groups containing hydrogen, carbon, and oxygen. ,− Moreover, highest resolution techniques such as high-resolution transmission electron microscopy (HRTEM) can provide visual observations of aromatic clusters, and their structural parameters (length and orientation) can be obtained by image analysis approaches. ,,− Recently, HRTEM has also been applied to study internal structures and textures of carbonaceous matter including coals and organic-rich shales. Examples contain lattice fringes derived from aromatic carbon layer arrangements and sizes, heterogeneity or structural homogeneity, and maturity of carbonaceous matter (e.g., anthracite, meta-anthracite, graphite) with high molecular ordering. , …”

Section: Introductionmentioning

confidence: 99%

Chemical Structure Transformations in Kerogen from Longmaxi Shales in Response to Tectonic Stress as Investigated by HRTEM, FTIR, and ¹³C NMR

Shang

Tang

et al. 2021

Energy Fuels

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Kerogen molecular structure controls the micropore (<2 nm diameter) evolution in shale and exerts a significant impact on shale gas adsorption, desorption, and diffusion. However, the influence of tectonic deformation on kerogen structure and organic micropores needs intensive study. Our study mainly focuses on the transformations in the extracted kerogen structure and organic micropores of Longmaxi shale during tectonic deformation. Vitrinite reflectance measurement (VRM) and Raman spectroscopy (RS) were utilized to determine the maturity of organic matter. Organic pore network attributes of kerogen samples were estimated using CO2 adsorption experiments. High-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), and 13C nuclear magnetic resonance (13C NMR) were utilized to interpret the kerogen molecular structures of these samples. VRM and RS results show that Longmaxi shale has reached the wet gas window. Adsorption analyses of CO2 indicate that kerogen samples in shale with strong deformation have larger micropore volume and surface area (<2 nm). 13C NMR and FTIR results reveal that the tectonic stress may promote the shedding of aliphatic carbon. HRTEM images exhibit that aromatic rings with a size of 3 × 3 account for the largest proportion in all kerogen samples, which indicates that the kerogen samples have reached a high thermal evolution level, consistent with the Raman experiment. For weakly deformed shale samples, 66.5 and 88.8% of the total number of aromatic rings in LZ-1 and LZ-4 kerogen belong to the major direction (within a 45° range). In the most strongly deformed sample, LZ-2, distribution orientations of aromatic fringes are dispersed and primarily concentrated at 15–105°. Such disorientation of nanometer-sized polyaromatic layers in the strongly deformed sample creates a nanopore network in organic matter (OM) that increases the micropore volume and surface area. These findings from integrated approaches can provide a new perspective of adsorbed gas enrichment in the complex tectonic areas.

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Organic geochemistry of kerogen from La Luna Formation, Western Venezuelan Basin, using diffuse reflectance – Fourier transform infrared spectroscopy (DRFTIR)

Cited by 13 publications

References 24 publications

Study on Pyrolysis Kinetics, Behavior, and Mechanism of Organic-Rich Tuffaceous Mudstones Based on Thermogravimetric Analysis

Study on Pyrolysis Kinetics, Behavior, and Mechanism of Organic-Rich Tuffaceous Mudstones Based on Thermogravimetric Analysis

Structural Alterations of Oils and Domanic Shales During Supercritical Water Injection

Chemical Structure Transformations in Kerogen from Longmaxi Shales in Response to Tectonic Stress as Investigated by HRTEM, FTIR, and ¹³C NMR

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Organic geochemistry of kerogen from La Luna Formation, Western Venezuelan Basin, using diffuse reflectance – Fourier transform infrared spectroscopy (DRFTIR)

Cited by 13 publications

References 24 publications

Study on Pyrolysis Kinetics, Behavior, and Mechanism of Organic-Rich Tuffaceous Mudstones Based on Thermogravimetric Analysis

Study on Pyrolysis Kinetics, Behavior, and Mechanism of Organic-Rich Tuffaceous Mudstones Based on Thermogravimetric Analysis

Structural Alterations of Oils and Domanic Shales During Supercritical Water Injection

Chemical Structure Transformations in Kerogen from Longmaxi Shales in Response to Tectonic Stress as Investigated by HRTEM, FTIR, and 13C NMR

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Chemical Structure Transformations in Kerogen from Longmaxi Shales in Response to Tectonic Stress as Investigated by HRTEM, FTIR, and ¹³C NMR