Correlation of 3D-computerized tomographic scans and 2D-colour image analysis of Westphalian coal by means of multivariate statistics

Verhelst, F.; David, P.; Fermont, W.J.J.; Jegers, L.F.; Vervoort, André

doi:10.1016/0166-5162(95)00026-7

Cited by 42 publications

(16 citation statements)

References 10 publications

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“…Several studies have been presented in the literature on estimating coal microstructure properties and coal microstructure visualization [12][13][14]11,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Small angle X-ray scattering has been used to estimate pore size distribution, porosity and interface area of coal [17,24,31].…”

Section: Introductionmentioning

confidence: 99%

“…X-ray computed tomography (CT) has recently shown good prospects for analyzing geological structures due to its ability to differentiate between different phases [14,16,[34][35][36][37]. CT has been extensively used to study the effects of gas adsorption on the coal structure and also for characterizing transport characteristics [22,26,21,23].…”

Section: Introductionmentioning

confidence: 99%

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Multi scale characterization of coal structure for mass transport

Pant

Huang

Secanell

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi scale characterization of coal structure for mass transport

Pant

Huang

Secanell

et al. 2015

Fuel

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“…In literature there are limited studies related to the flow, storage mechanisms, and structure and property variation of coal. Several authors have demonstrated that x-ray CT can be a useful tool in studying the distributions of coal density (10) , minerals and cleat/fracture distribution (11,12,13) , and coal adsorption and swelling by CO 2 (2,14,15,16) . With the help of other image tools, x-ray CT can be used to investigate the gas storage and transport properties of coal (17,18,19) .…”

Section: Introductionmentioning

confidence: 99%

The Stress and Gas Adsorptive Effect on Coal Densities in Laboratory CBM/ECBM Processes

Guo

Kantzas

2008

Canadian International Petroleum Conference

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Density is an important coal property that determines the potential of gas resources in CBM reservoir. This paper aims to investigate coal density and structure variation during primary CBM and CO 2 -ECBM experiments. A coal core sample from Alberta Mannville formation with the rank of SubB was used to conduct the core flooding experiments covering the stages of inert gas flow, methane production, methane displacement by CO 2 and inert gas flow after CO 2 desorption. The x-ray CT experiments were carried out parallel to the core flooding experiment to provide x-ray images of coal core saturated with different gases at different stress conditions. The x-ray techniques were used for visualization and mapping of larger fractures and mineral streaks, as well as identification of flow paths. The coal density and density distribution changed with the gas adsorptive capacity and the stress condition were obtained.The results show that net stress, gas adsorption capacity, and the production history are all key factors affecting coal core structure, leading coal density and density distribution variations. Hence, the core flow path, which contributes to the coal permeability, changes with those factors during CBM/ECBM processes. The results from this study provide laboratory coal characterization techniques using x-ray imaging analysis.

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“…X‐ray microcomputed tomography (CT) is a noninvasive and nondestructive imaging technique capable of characterizng the coal cleats/fractures [ Karacan and Okandan , ; Karacan , ; Mazumder et al ., ; Pyrak‐Nolte et al ., ; Van Geet and Swennen , ; Wolf et al ., ; Yao , ], macerals [ Van Geet et al ., ; Verhelst et al ., ], minerals [ Golab et al ., ; Simons et al ., ], and gas sorption properties in coal [ He et al ., ; Karacan and Okandan , ; Karacan and Mitchell , ; Wang et al ., ]. This technique has also been used to investigate coal drying [ Mathews et al ., ], aperture enhancement in coal [ Kumar , ], swelling related to CO 2 injection [ Karacan , ; Pone et al ., ; Pone et al ., ], as well as to investigate the features of incipient failure in coal under static and dynamic loading conditions [ Zhao and Jiang , ; Zhao et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Failure mechanisms in coal: Dependence on strain rate and microstructure

et al. 2014

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The brittle coal failure behavior under various axial strain rates from 10 À3 to 10 À2 s À1 is experimentally and numerically studied. The numerical microscale finite difference model is built on the accurate X-ray microcomputed tomography images, which provides a ground-breaking and bottom-up approach to investigate the effects of microstructure on coal failure under various strain rates. Experimentally, prior to loading, the coal sample is scanned, and the three-dimensional coal structure model is constructed. The microheterogeneous structures are incorporated in the model, which facilitates the deformation and failure mechanism analysis under different loading conditions. The results reveal that the microheterogeneous structures significantly affect the evolution of stress concentrations and deformation behaviors in the sample. The coal tends to fail in the shear mode before the peak strength, since the shear zone is created with high displacements. However, tensile failure ultimately controls the failure process after the peak strength. Notably, the strain rate dependence of coal strength is observed, and an empirical relationship is proposed to describe the dynamic strength of the coal under various loading strain rates. Importantly, the coal strengthens with an increase in strain rate. For brittle material, such as coal, the strength and failure mechanism are strain rate and microstructure dependent. The strain rate-dependent coal strength index (n) is found to be a dynamic parameter in the range of strain rate from 10 À3 to 10 À2 s À1, and this finding may extend the concept of strain rate dependence over a broader range of loading conditions.

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Correlation of 3D-computerized tomographic scans and 2D-colour image analysis of Westphalian coal by means of multivariate statistics

Cited by 42 publications

References 10 publications

Multi scale characterization of coal structure for mass transport

Multi scale characterization of coal structure for mass transport

The Stress and Gas Adsorptive Effect on Coal Densities in Laboratory CBM/ECBM Processes

Failure mechanisms in coal: Dependence on strain rate and microstructure

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