A new method to estimate the oil and gas potentials of coals and kerogens by solid state 13C NMR spectroscopy

Kuangzong, Qin; Chen, Deyu; Zhanguang, Li

doi:10.1016/0146-6380(91)90026-g

Cited by 39 publications

(10 citation statements)

References 12 publications

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“…The signals in the 31−37 and 37−45 ppm regions are defined as the methine signal and the quaternary carbon signal, respectively. 2,5,10,13,16 Results show that the kerogen NMR spectra in this study can be divided into three types (Figure 7), corresponding to the northern, central, and southern regions, which correlate with the sedimentary facies of the source rocks (Figure 1). The spectral characteristics of other samples are similar to these three representative types.…”

Section: Soluble Organic Matter Compositionmentioning

confidence: 75%

“…In this study, we defined four types of NMR structural parameters, namely, indices reflecting structures, types, maturity, and hydrocarbon potential of kerogens, based on previous studies. 2,5,16,39,40,42 (1) Indices representative of structures of kerogen (definitions for these parameters can be found in the footnotes of Tables 3−5):…”

Section: Soluble Organic Matter Compositionmentioning

confidence: 99%

“…The induced magnetic field generated in the applied magnetic field is different in size and, therefore, the frequency of the applied magnetic field or radio frequency required for resonance of different nuclear properties is also different. Based on this, different types of organic molecules can be identified. − …”

Section: Introductionmentioning

confidence: 99%

“…Figure10. Hydrocarbon generation behavior of kerogen as reflected in NMR spectra (modified after Qin et al5 and Longbottom et al14 ). It is a generalized model.…”

mentioning

confidence: 99%

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Application of Nuclear Magnetic Resonance (NMR) Spectroscopy to Lacustrine Kerogen Geochemistry: Paleogene Dongpu Sag, China

Gao

Cao

et al. 2021

Energy Fuels

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Solid-state nuclear magnetic resonance (NMR) spectroscopy has been widely used in organic geochemistry because of its utility in examining the chemical structures present in sedimentary organic matter (kerogen). Here, we present such an investigation of kerogens from the Paleogene Shahejie Formation in the Dongpu Sag, Bohai Bay Basin, eastern China. Results show that the NMR spectra and their parameters are sensitive to kerogen type as defined by elemental ratios. The NMR spectra of types I and II kerogens are similar and show that the dominant chemical structures are aliphatic functional groups (e.g., methylene and methyl carbons), followed by aromatic moieties, with relatively fewer structures containing heteroatoms. In contrast, type III kerogen is considerably different, having a much lower aliphatic than aromatic functional group content and a higher degree of aromaticity. Based on this, a formula is established in response to the source rock hydrogen index and hydrocarbon generation potential. Our data suggest that the chemical structural characteristics of lacustrine facies kerogens can be effectively studied by NMR in good response to hydrocarbon geochemistry. This implies that NMR is possibly a promising approach in lacustrine organic geochemistry and provides complements to the challenging study of paleoenvironment and organic matter accumulation in lacustrine systems due to the heterogeneity of source rock deposition.

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Section: Soluble Organic Matter Compositionmentioning

confidence: 75%

Section: Soluble Organic Matter Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Figure10. Hydrocarbon generation behavior of kerogen as reflected in NMR spectra (modified after Qin et al5 and Longbottom et al14 ). It is a generalized model.…”

mentioning

confidence: 99%

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Application of Nuclear Magnetic Resonance (NMR) Spectroscopy to Lacustrine Kerogen Geochemistry: Paleogene Dongpu Sag, China

Gao

Cao

et al. 2021

Energy Fuels

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“…In the kerogen structure, aromatics that are linked by aliphatic and heteroatoms [15], in which solid bitumen can be trapped [61,62]. The increase in carbon aromaticity that takes place during maturation has been also detected during natural maturation that is caused by igneous intrusions [63][64][65][66][67][68], or by the increase in depth of burial [69][70][71].…”

Section: Pi = S1mentioning

confidence: 99%

Evaluating Molecular Evolution of Kerogen by Raman Spectroscopy: Correlation with Optical Microscopy and Rock-Eval Pyrolysis

Khatibi

Ostadhassan

Tuschel³

et al. 2018

Energies

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Vitrinite maturity and programmed pyrolysis are conventional methods to evaluate organic matter (OM) regarding its thermal maturity. Moreover, vitrinite reflectance analysis can be difficult if prepared samples have no primary vitrinite or dispersed widely. Raman spectroscopy is a nondestructive method that has been used in the last decade for maturity evaluation of organic matter by detecting structural transformations, however, it might suffer from fluorescence background in low mature samples. In this study, four samples of different maturities from both shale formations of Bakken (the upper and lower members) Formation were collected and analyzed with Rock-Eval (RE) and Raman spectroscopy. In the next step, portions of the same samples were then used for the isolation of kerogen and analyzed by Raman spectroscopy. Results showed that Raman spectroscopy, by detecting structural information of OM, could reflect thermal maturity parameters that were derived from programmed pyrolysis. Moreover, isolating kerogen will reduce the background noise (fluorescence) in the samples dramatically and yield a better spectrum. The study showed that thermal properties of OM could be precisely reflected in Raman signals.

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13C high resolution solid state NMR spectra of Chinese coals

Chen

1997

Sci. China Ser. D-Earth Sci.

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A new method to estimate the oil and gas potentials of coals and kerogens by solid state 13C NMR spectroscopy

Cited by 39 publications

References 12 publications

Application of Nuclear Magnetic Resonance (NMR) Spectroscopy to Lacustrine Kerogen Geochemistry: Paleogene Dongpu Sag, China

Application of Nuclear Magnetic Resonance (NMR) Spectroscopy to Lacustrine Kerogen Geochemistry: Paleogene Dongpu Sag, China

Evaluating Molecular Evolution of Kerogen by Raman Spectroscopy: Correlation with Optical Microscopy and Rock-Eval Pyrolysis

13C high resolution solid state NMR spectra of Chinese coals

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