Spectral characterization of the key parameters and elements in coal using terahertz spectroscopy

Zhan, Honglei; Zhao, Kun; Xiao, Lizhi

doi:10.1016/j.energy.2015.09.116

Cited by 49 publications

(21 citation statements)

References 32 publications

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“…The experimental setup used in this research comprises a transmission THz-TDS system and a femtosecond Ti-sapphire LASER (Maitai) from Spectral-Physics. [24][25][26][27][28] As shown in Figure 1, a femtosecond laser beam (800 nm) was split into two beams. The pump beam was to generate THz radiation through an emitter composed of a photo-conductive antenna, and the probe beam was for electro-optic detection.…”

Section: Terahertz Time-domain Spectroscopy Experimentsmentioning

confidence: 99%

“…[19][20][21][22][23][24] Recently, the THz technique has also been applied in the petroleum and coal industries. [25][26][27][28][29] As a natural material, rocks with different compositions are expected to present different dielectric properties, which could be detected by THz waves. To date, THz spectroscopy has been applied for the investigation of the optical properties of marble, sandstone, and limestone.…”

Section: Introductionmentioning

confidence: 99%

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Discriminating the Mineralogical Composition in Drill Cuttings Based on Absorption Spectra in the Terahertz Range

Miao

Bao

et al. 2016

Appl Spectrosc

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Understanding the geological units of a reservoir is essential to the development and management of the resource. In this paper, drill cuttings from several depths from an oilfield were studied using terahertz time domain spectroscopy (THz-TDS). Cluster analysis (CA) and principal component analysis (PCA) were employed to classify and analyze the cuttings. The cuttings were clearly classified based on CA and PCA methods, and the results were in agreement with the lithology. Moreover, calcite and dolomite have stronger absorption of a THz pulse than any other minerals, based on an analysis of the PC1 scores. Quantitative analyses of minor minerals were also realized by building a series of linear and non-linear models between contents and PC2 scores. The results prove THz technology to be a promising means for determining reservoir lithology as well as other properties, which will be a significant supplementary method in oil fields.

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Section: Terahertz Time-domain Spectroscopy Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Discriminating the Mineralogical Composition in Drill Cuttings Based on Absorption Spectra in the Terahertz Range

Miao

Bao

et al. 2016

Appl Spectrosc

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“…The pore size is approximately or less than the wavelength of the THz wave, and diffraction effects occur. Both a and b cause the attenuation of peak amplitude and the increase of delay time [11]- [13]. For oil-bearing rocks, the oil penetrates into the depression of the rock surface and the rock surface is relatively flat, thus there are less scattering and diffraction effects.…”

Section: Introductionmentioning

confidence: 99%

Optical Detection of Oil Bearing in Reservoir Rock: Terahertz Spectroscopy Investigation

et al. 2019

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To accurately reflect the physical properties of the reservoir, it is necessary to use a variety of techniques to evaluate the reservoir, due to the complexity of the reservoir. In this paper, the oil is dripped into the rock to simulate the reservoir, and the transmission properties of the terahertz (THz) wave in the reservoir were studied. The extinction coefficient of rock was a key parameter for comprehending the properties of mineral and organic matter. The higher the frequency was, the larger the extinction coefficient was. The extinction coefficient was composed of the absorption and the scattering, which the latter played a more important role. The results revealed the transmission properties of the THz wave in rock, which can help in improving the efficiency of terahertz time domain spectroscopy (THz-TDS) and enriching the method of oil field exploration.

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“…In recent years, various optical techniques have emerged as important tools for evaluating the potential of reservoirs and for characterizing oil-gas and pollutant properties1314. Representative newly developed techniques include terahertz (THz) spectroscopy1516, all-optical detection17, and remote sensing18. Similar to the optical methods mentioned above, OIRD is insensitive to the interference of subsurface electromagnetic fields and to high subsurface temperature and pressure.…”

mentioning

confidence: 99%

Real-time detection of dielectric anisotropy or isotropy in unconventional oil-gas reservoir rocks supported by the oblique-incidence reflectivity difference technique

Zhan

Wang

Zhao

et al. 2016

Sci Rep

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Current geological extraction theory and techniques are very limited to adequately characterize the unconventional oil-gas reservoirs because of the considerable complexity of the geological structures. Optical measurement has the advantages of non-interference with the earth magnetic fields, and is often useful in detecting various physical properties. One key parameter that can be detected using optical methods is the dielectric permittivity, which reflects the mineral and organic properties. Here we reported an oblique-incidence reflectivity difference (OIRD) technique that is sensitive to the dielectric and surface properties and can be applied to characterization of reservoir rocks, such as shale and sandstone core samples extracted from subsurface. The layered distribution of the dielectric properties in shales and the uniform distribution in sandstones are clearly identified using the OIRD signals. In shales, the micro-cracks and particle orientation result in directional changes of the dielectric and surface properties, and thus, the isotropy and anisotropy of the rock can be characterized by OIRD. As the dielectric and surface properties are closely related to the hydrocarbon-bearing features in oil-gas reservoirs, we believe that the precise measurement carried with OIRD can help in improving the recovery efficiency in well-drilling process.

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Spectral characterization of the key parameters and elements in coal using terahertz spectroscopy

Cited by 49 publications

References 32 publications

Discriminating the Mineralogical Composition in Drill Cuttings Based on Absorption Spectra in the Terahertz Range

Discriminating the Mineralogical Composition in Drill Cuttings Based on Absorption Spectra in the Terahertz Range

Optical Detection of Oil Bearing in Reservoir Rock: Terahertz Spectroscopy Investigation

Real-time detection of dielectric anisotropy or isotropy in unconventional oil-gas reservoir rocks supported by the oblique-incidence reflectivity difference technique

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