Characterization of Nanoporous Systems in Gas Shales by Low Field NMR Cryoporometry

Zhou, Bing; Han, Qian; Yang, Ping

doi:10.1021/acs.energyfuels.6b01780

Cited by 29 publications

(47 citation statements)

References 35 publications

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“…For example in Ref. [36], relaxation time distributions of various shale samples appeared to be independent of the sample and, hence, did not reflect the pore size distribution. Furthermore, NMRC measurements of mesopore sizes in cement and shale samples have turned out to be challenging [36].…”

Section: Introductionmentioning

confidence: 96%

Characterization of pore structures of hydrated cements and natural shales by 129 Xe NMR spectroscopy

Zhou

Komulainen

Vaara

et al. 2017

Microporous and Mesoporous Materials

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129 Xe NMR of adsorbed xenon gas is a sensitive tool for the characterization of porous materials. Here we exploit, for the first time, 129 Xe NMR to investigate the nanoscale porous structures in hydrated white cements and natural shale. Signals of xenon in mesopores and larger voids are well resolved in the spectra of the cement samples, and the exchange rate between these sites was determined to be 100−300 s-1 at room temperature. The spectra imply that the mesopore size is the smallest and the exchange rate is the highest in the sample with the lowest initial water/cement ratio. The heat of adsorption of xenon in the cements is similar to that in silica gels, about 12 kJ/mol. The shale spectra include a very broad signal, covering a range of about 600 ppm, implying that the adsorbed xenon interacts with the paramagnetic impurities present in the samples.

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Section: Introductionmentioning

confidence: 96%

Characterization of pore structures of hydrated cements and natural shales by 129 Xe NMR spectroscopy

Zhou

Komulainen

Vaara

et al. 2017

Microporous and Mesoporous Materials

Self Cite

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“…NMRC is a new method for measuring the nanometer pore of coal and shale and based on the Gibbs-Thomson equation [28,38,39]. In recent years, this experiment has also been used for tight sandstone pore size analysis [13,28].…”

Section: Materials and Analysesmentioning

confidence: 99%

Integration of NMR and NMRC in the Investigation of the Pore Size Distribution of Tight Sandstone Reservoirs: A Case Study in the Upper Paleozoic of Dongpu Depression

et al. 2021

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Exploring appropriate methods to understanding the pore structure and overall pore size distribution (PSD) of tight sandstone reservoir is important for evaluating the quality of the reservoir. An integration analysis comprising X-ray diffraction (XRD), three beams of argon ion (TIB) polishing approach, scanning electron microscopy (SEM), high-pressure mercury intrusion (HPMI), nuclear magnetic resonance (NMR), and nuclear magnetic resonance cryoporometry (NMRC) was applied to determine the pore structure of the tight sandstone reservoirs in the Upper Paleozoic of Dongpu Depression as well as their relationship with the physical properties of the reservoirs. NMRC offered the possibility to obtain the nanoscale (4-1400 nm) pore structure of the reservoirs directly and accurately. Therefore, an attempt by combining NMRC and NMR can reveal the PSD of tight sandstone reservoirs with different pore structures. The results showed that the tight sandstone reservoirs consisted of intergranular, intragranular, and intercrystalline (clay mineral) pores. The full PSD intelligibly showed pore structure characteristics of four different types of reservoirs, with pore sizes ranging from 2 nm to dozens of microns. Specifically, the overall PSD of type I reservoirs showed a broad unimodal distribution pattern with the peaks in the range 0.1–2 μm, indicating an association with dissolution intergranular pores, and for type II reservoirs, the overall PSD showed a bimodal distribution pattern, with their left and right peaks, in the ranges 0.004–0.01 μm and 0.15–0.4 μm, respectively, showing similar amplitudes, implying the predominance of both intergranular (mesopores) and intergranular (macropores) pores. The full PSDs of type III and IV reservoirs showed much lower amplitudes than type I and II reservoirs, indicating a lower pore number and a complex pore structure. Furthermore, NMRC also demonstrated that different diagenesis resulted in a correlation between pore structure and reservoir physical properties.

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“…The pore structure measured by NMR is relatively inaccurate and has a low resolution. By contrast, the NMRC technique yields small uncertainties in temperature at each small incremental step [34] and can accurately characterize the pore structure of coals with a higher resolution, the result of which is that the D NMRC is larger than the D NMR .…”

Section: Fractal Characteristics and Its Controlling Factors 431 Fractal Characteristicsmentioning

confidence: 99%

Size Distribution and Fractal Characteristics of Coal Pores through Nuclear Magnetic Resonance Cryoporometry

et al. 2017

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Characterization of the coal pore structure plays a critical role in the adsorption and flow of coalbed methane (CBM) during CBM exploitation. The accuracy of conventional techniques is relatively low, especially for micropores.Nuclear magnetic resonance cryoporometry (NMRC), as a new technique that is used to detect the pore structure of porous media, has been applied to many fields. However, it is rarely used for CBM reservoirs. In this study, the pore size distribution (PSD) and fractal characteristics of semianthracites and anthracites are investigated through NMRC, routine NMR and low-temperature nitrogen adsorption methods. The results show that the PSD obtained from NMRC is divided into three types, which are mainly affected by the metamorphic degree of the selected coals (coal rank). Type I PSD from NMRC shares a high consistency with that yielded by NMR. The comparison between PSD from NMRC and NMR shows that the NMR method yields a higher pore volume for adsorption pores than that of NMRC due to the presence of skeleton information and paramagnetic impurities. The fractal result of coal pores from NMRC indicates that the transition pores and mesopores are more complex than the micropores. Moreover, the results from NMRC represent a more accurate pore Page 1 of 45 ACS Paragon Plus Environment Energy & Fuels 2 structure for the same coal sample compared with NMR. The relationships between pore volume, permeability, Langmuir volume and pore fractals has also been established, which proves that, as a new method, NMRC is of great significance in characterizing the petrophysical properties of CBM reservoirs.

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Characterization of Nanoporous Systems in Gas Shales by Low Field NMR Cryoporometry

Cited by 29 publications

References 35 publications

Characterization of pore structures of hydrated cements and natural shales by 129 Xe NMR spectroscopy

Characterization of pore structures of hydrated cements and natural shales by 129 Xe NMR spectroscopy

Integration of NMR and NMRC in the Investigation of the Pore Size Distribution of Tight Sandstone Reservoirs: A Case Study in the Upper Paleozoic of Dongpu Depression

Size Distribution and Fractal Characteristics of Coal Pores through Nuclear Magnetic Resonance Cryoporometry

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