Oil Yield Characterization by Anisotropy in Optical Parameters of the Oil Shale

Miao, Xin Y.; Zhan, Hong; Zhao, Kun; Li, Yi Z.; Sun, Qi; Bao, Ri M.

doi:10.1021/acs.energyfuels.6b02443

Cited by 20 publications

(24 citation statements)

References 46 publications

(85 reference statements)

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“…The average n values were 1.98 and 2.16 for the oil shale from Huadian and Beipiao, revealing an inverse relationship to the oil yield by the previous Fischer assay method. 23,24 After high-temperature pyrolysis, kerogen was completely decomposed. Thermogravimetric analysis (TGA) measurements were then performed by simultaneously heating and weighting both samples.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Increasing organic content has promoted the anisotropic degree of oil shale, and a linear correlation can be built between the n anisotropy and the oil yield, providing an alternative parameter for oil yield characterization. 24 Here, in order to establish an efficient and a helpful means for oil shale exploitation, we undertook an investigation of the organic distribution and oil yields in oil shale by THz spectroscopy. The dielectric properties of the oil shale from Huadian and Beipiao were studied by THz imaging methods.…”

Section: ■ Introductionmentioning

confidence: 99%

“…To date, THz technology has been utilized to evaluate the dielectric properties of various minerals and rocks, including kaolinite, montmorillonite, halloysite, sandstone, limestone, marble, etc., showing different quantitative relations between the mineral’s content and THz parameters. − In the study of oil shale, relations were built between THz absorption and the oil content in semicoke, which could be a significant indicator of pyrolysis process optimization. − The anisotropic optical responses of oil shales were measured by THz spectroscopy, revealing a refractive index ( n ) anisotropy associated with the bedding planes. Increasing organic content has promoted the anisotropic degree of oil shale, and a linear correlation can be built between the n anisotropy and the oil yield, providing an alternative parameter for oil yield characterization . Here, in order to establish an efficient and a helpful means for oil shale exploitation, we undertook an investigation of the organic distribution and oil yields in oil shale by THz spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Determination of Organic Distribution and Content in Oil Shale by Terahertz Imaging

Miao

Chen

et al. 2020

Energy Fuels

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Organics in oil shale play a significant role in the generation and production of oil gas. Visualizing the content and distribution of organics in the reservoir is the key objective of unconventional resource research. In this study, we demonstrate the application of terahertz (THz) imaging to measure the dielectric properties of oil shale from Huadian and Beipiao with different oil yields. The heterogeneous distributions of organics on the oil shale surface were evaluated by THz amplitude imaging, with the existence of kerogen-rich and kerogen-poor areas identified by different colors. Meanwhile, the average refractive indices of the samples were plotted with the oil yield, revealing a negative correlation between them. Our results prove that THz spectroscopy can provide not only a promising technique to visualize the organic distribution in oil shale but also a convenient means for the quantitative analysis of the organic content in oil shale.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneous Determination of Organic Distribution and Content in Oil Shale by Terahertz Imaging

Miao

Chen

et al. 2020

Energy Fuels

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“…Since the absorption coefficient is related to the oil content in the rock, it can be used to measure the oil content in reservoir rock. In addition, refractive index anisotropies of oil shale were plotted as a function of the OM content, showing that the increase of OM has promoted the oil shale anisotropy in the THz range. − Hence, THz-TDS technology has the potential to become a trace OM detection method that can be applied to complex industries or fields.…”

Section: Introductionmentioning

confidence: 99%

Thermal Terahertz Analysis for the Detection of Trace Organic Matter

Qin

Chen

et al. 2021

Energy Fuels

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The technology of trace organic matter (OM) detection offers researchers numerous intriguing possibilities, ranging from fundamental science to applications in many fields. This study proposes a thermal terahertz (THz) analysis (TTA) method that is suitable for detecting trace OM in the field of oil− gas resource and can analyze the differences in the content and type of trace OM. In this research, THz time-domain spectroscopy (THz-TDS) technology combined with pyrolysis technology were used to detect the pyrolysis characteristics of trace OM in sand collected from a desert oilfield. According to thermogravimetric analysis, the main pyrolysis temperature range of the OM was 300−600 °C. Further analysis of the spectra indicated that when the pyrolysis temperature was 300 °C, the OM content in the sand was the highest and the THz waves were the most attenuated due to the strong interaction between OM and THz waves. As the pyrolysis temperature increased, the OM was gradually pyrolyzed into gas and escaped and the peak amplitude (Ep) of the THz-TDS clearly increased. When the pyrolysis temperature reached 600 °C, the OM was completely pyrolyzed while the Ep of the THz-TDS changed very little. Consequently, the trace OM detection method based on THz spectroscopy combined with pyrolysis technology is expected to become a new complementary means for the detection of trace OM information.

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“…Various crystals and alternating structures have been studied to exhibit THz birefringence. 23 In our previous work, 24 anisotropic responses of oil shales were initially studied by THz-time domain spectroscopy (THz-TDS).…”

Section: Introductionmentioning

confidence: 99%

Layer Caused an Anisotropic Terahertz Response of a 3D-printed Simulative Shale Core

et al. 2017

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Energy demands have motivated the development of shale formations as significant unconventional reservoirs. The anisotropy of shales plays a significant role in both the mechanical behavior and engineering activities. Alternating layers presented in shales affect the propagation of waves, causing anisotropy at various frequencies. Simplifying the complicated interior structures of shales is conducive to characterize the anisotropic properties. Therefore, simulative shale core samples were designed and fabricated using additive manufacturing processes, and layer-caused dielectric anisotropy was investigated by terahertz (THz) time-domain spectroscopy. On the basis of effective medium theory, the change of the optical length caused by refraction of rays was discussed and modeled. It is believed that the refraction of rays at the interfaces is the source of THz propagation anisotropy in the multilayered structure, and the anisotropy degree is mainly influenced by the layer thickness as well as the refractive index.

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Oil Yield Characterization by Anisotropy in Optical Parameters of the Oil Shale

Cited by 20 publications

References 46 publications

Simultaneous Determination of Organic Distribution and Content in Oil Shale by Terahertz Imaging

Simultaneous Determination of Organic Distribution and Content in Oil Shale by Terahertz Imaging

Thermal Terahertz Analysis for the Detection of Trace Organic Matter

Layer Caused an Anisotropic Terahertz Response of a 3D-printed Simulative Shale Core

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