Application of nuclear magnetic resonance (NMR) in coalbed methane and shale reservoirs: A review

Liu, Zhengshuai; Liu, Dameng; Cai, Yidong; Yao, Yanbin; Pan, Zhejun; Zhou, Yingfang

doi:10.1016/j.coal.2019.103261

Cited by 190 publications

(80 citation statements)

References 118 publications

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“…The recent development of atomic force microscopy-based infrared spectroscopy (AFM-IR) was also employed to examine the molecular structure of organic matters to provide an insight into the chemical diversities of an inertinite composition (Jubb et al, 2020). Nuclear magnetic resonance (NMR) as a rapid and nondestructive method to distinguish pore types, and fluid types and states, has been widely applied to calculate the total porosity, estimate organic and inorganic matter porosity, characterize pore size distributions, estimate permeability, and interpret wettability (Gao et al, 2018;Yuan et al, 2018;Liu et al, 2020;Ma et al, 2020;Zhang et al, 2020;Liu et al, 2021). The fluid invasion approaches including high-pressure mercury intrusion capillary pressure (MICP) testing and low-pressure adsorption (LPA) have often been used to characterize pore structures of shales (Yao et al, 2008;Clarkson et al, 2013;Tian et al, 2013;Afsharpoor and Javadpour, 2018;Sang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Liu

Fan

et al. 2021

Front. Earth Sci.

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Pore connectivity is crucial for shale gas production. However, the three-dimensional (3D) characteristics and distribution of pore networks and, more fundamentally, the underlying role of different pore types on pore connectivity in shales are inadequately understood. By comparing the 3D pore connectivity derived from direct microstructural imaging of pores filled with Wood’s metal at a pressure corresponding to the finest accessible pore throat in the resolution ranges that may be achieved by X-ray micro-CT and SEM, it is possible to evaluate pore connectivity of different types of shales. The pore connectivity of three shales including a mixed mudstone, siliceous shale, and argillaceous shale from the Silurian Longmaxi Formations is investigated via combined broad ion beam (BIB) polishing, and SEM and X-ray micro-CT imaging after Wood’s metal injection at a pressure up to 380 MPa. The three shales show significant differences in pore connectivity. The mixed mudstone shows excellent pore connectivity in the matrix; the siliceous shale shows an overall poor connectivity with only a small amount of OM (organic matter) pores immediately adjacent to microfractures displaying interconnectivity, while the pores in the argillaceous shale, dominated by plate-like clay pores, are largely not interconnected.

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Section: Introductionmentioning

confidence: 99%

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Liu

Fan

et al. 2021

Front. Earth Sci.

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“…The less accurate moisture estimation mentioned above for the dry coal samples with equal to or less than 12 wt.%H 2 O could be improved by the following advanced methods. (i) The use of the multi-exponential model (Liu et al 2020) instead of the monoexponential model, Eq. (1), would be more promising for the analysis of heterogeneous natural coals having various pore diameters.…”

Section: Discussionmentioning

confidence: 99%

Nondestructive quantification of moisture in powdered low-rank coal by a unilateral nuclear magnetic resonance scanner

Nakashima

Sawatsubashi

Fujii

2020

International Journal of Coal Preparation and Utilization

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Moisture content in coal powder is a critical index because it controls the difficulty of coal handling and ultimately its combustion efficiency in coalfired power plants. A unilateral proton nuclear magnetic resonance (NMR) scanner was applied in a laboratory to nondestructively quantify moisture content in powdered samples of brown and subbituminous coals. Due to the open geometry of the sensor unit, the scanner allows the nondestructive moisture quantification of a portion several millimeters below the surface of a large sample. Proton transverse relaxation was measured by the unilateral NMR scanner, and obtained moisture content values were compared with those by a conventional bilateral NMR apparatus. The comparison showed reasonable agreement with a root mean square residual of 4.1 wt.%H 2 O for a moisture content range of > 12 wt.% H 2 O (wet basis). This moisture-quantification performance by unilateral NMR is sufficient for the quality control of wet coal having a critical value of approximately 30 wt.%H 2 O in terms of the handling property (flow-ability). Because unilateral NMR requires no specific sample preparation, such as sample insertion into tubes, the system is potentially applicable to insitu nondestructive monitoring of the coal moisture in power plants to contribute to improved efficiency of handling and combustion. ARTICLE HISTORY

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“…Coal is a kind of heterogeneous microporous material with a high surface area, whose pore size spans from as small as less than 1 nm to as large as several hundred nanometers of plant cell pores [34]. The pore surface of coal has a strong adsorption force on gas, and the amount of gas stored in the coal seam depends on the volume and surface area of pores [35,36].…”

Section: Pore Structurementioning

confidence: 99%

Methane Adsorption Interpreting with Adsorption Potential and Its Controlling Factors in Various Rank Coals

et al. 2020

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Water content, metamorphism (coal rank) particle size, and especially pore structure, strongly influence the adsorption capacity of coal to methane. To understand the mechanism of methane adsorption in different rank coals, and its controlling factors, isothermal adsorption experiments with different coal ranks, moisture contents and particle sizes at the temperature of 303.15 K were conducted. In addition, the pore structures of coals were investigated through N2 adsorption/desorption experiments at the low-temperature of 77 K for selected coals from the Junggar Basin of NW China, Qinshui Basin and Ordos Basin of north China. Moreover, the adsorption potential of methane on the surface of the coal matrix was calculated, the controlling factors of which were discussed. The obtained methane isothermal adsorption result shows that the Langmuir volume (VL) of coal is independent of the particle size, and decreases with the increase of moisture content, which decreases first and then increases when the coal rank increases. Combined with the pore structure by the N2 adsorption at 77 K, VL increases with the increase of pore surface area and pore volume of coal pores. Besides, the adsorption potential of all selected coals decreased with the increase of the methane adsorption volume, showing a negative relationship. The interesting phenomena was found that the surface adsorption potential of the coal matrix decreases with the increase of moisture content, and increases with the decrease of particle size at the same pressure. With the same adsorption amount, the adsorption potential on the surface of coal matrix decreases first, and then increases with the increase of coal rank, reaching a minimum at Ro,m of 1.38%, and enlarging with the increase of pore surface area and the pore volume of coal pores. These findings may have significant implications for discovering CBM accumulation areas and enhancing CBM recovery.

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Application of nuclear magnetic resonance (NMR) in coalbed methane and shale reservoirs: A review

Cited by 190 publications

References 118 publications

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Pore Connectivity Characterization Using Coupled Wood’s Metal Intrusion and High-Resolution Imaging: A Case of the Silurian Longmaxi Shales From the Sichuan Basin, China

Nondestructive quantification of moisture in powdered low-rank coal by a unilateral nuclear magnetic resonance scanner

Methane Adsorption Interpreting with Adsorption Potential and Its Controlling Factors in Various Rank Coals

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