Characterization of pore microstructure and methane adsorption of organic-rich black shales in northwestern Hunan, South China

Yanran Huang*, Li Dong, Andrew Hursthouse, Junping Huang, Ye Yu, Junping Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The gas adsorption of shale is one of the most important factors influencing shale gas accumulation and production. Different from other shale gas fields, the shale in Northwestern Hunan province with strong structural deformation has especially high portion of adsorbed gas. The adsorption abilities of shale reservoir play a significant role in the success of exploration and production of shale gas in Northwestern Hunan. Therefore, based on many experiments including field emission scanning electron microscopy, N2/CO2 adsorption, excess CH4 adsorption with constant temperature and others, this paper found that: 1) The shale pores were identified with mineral matrix pores, organic matter pores and fracture pores, and the pores can be further classified according to their shape features and forming mechanism; 2) After analyses of the distribution of the pore size, Mesoporous is the largest contributor and widely distributed, and micropores provide more contribution on surface area but limited contribution to pore volume. Meanwhile, depth has little effect on the properties of shale reservoirs; 3) Based on the fractal geometry theory, surface roughness is positively correlated to microstructure irregularity, which means the effects between the gas adsorption by Van der Waals force and by multi-layer or capillary condensation in single pore system are consistent during the N2 adsorption process. 4) The abilities of gas storage are apparently sensitive to the surface roughness of shale pores and non-sensitive to microstructure irregularity. TOC has strong positive correlation with the surface roughness, specific surface area, total pore volume and Langmuir volume, which means TOC can improve the adsorption of shale reservoir in many ways. Pyrite can offer much contribution to the ability of gas adsorption.
Original languageEnglish
Pages (from-to)473-493
Number of pages21
JournalEnergy Exploration & Exploitation
Volume38
Issue number2
Early online date26 Sep 2019
DOIs
Publication statusE-pub ahead of print - 26 Sep 2019

Fingerprint

Shale
microstructure
Methane
methane
shale
adsorption
Adsorption
Microstructure
Gas adsorption
surface roughness
Surface roughness
gas
surface area
Van der Waals forces
Pyrites
gas storage
Specific surface area
Field emission
Fractals
Biological materials

Keywords

  • Black shales
  • Northwestern Hunan
  • Pore microstructure
  • Fractal dimension
  • Adsorption ability

Cite this

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title = "Characterization of pore microstructure and methane adsorption of organic-rich black shales in northwestern Hunan, South China",
abstract = "The gas adsorption of shale is one of the most important factors influencing shale gas accumulation and production. Different from other shale gas fields, the shale in Northwestern Hunan province with strong structural deformation has especially high portion of adsorbed gas. The adsorption abilities of shale reservoir play a significant role in the success of exploration and production of shale gas in Northwestern Hunan. Therefore, based on many experiments including field emission scanning electron microscopy, N2/CO2 adsorption, excess CH4 adsorption with constant temperature and others, this paper found that: 1) The shale pores were identified with mineral matrix pores, organic matter pores and fracture pores, and the pores can be further classified according to their shape features and forming mechanism; 2) After analyses of the distribution of the pore size, Mesoporous is the largest contributor and widely distributed, and micropores provide more contribution on surface area but limited contribution to pore volume. Meanwhile, depth has little effect on the properties of shale reservoirs; 3) Based on the fractal geometry theory, surface roughness is positively correlated to microstructure irregularity, which means the effects between the gas adsorption by Van der Waals force and by multi-layer or capillary condensation in single pore system are consistent during the N2 adsorption process. 4) The abilities of gas storage are apparently sensitive to the surface roughness of shale pores and non-sensitive to microstructure irregularity. TOC has strong positive correlation with the surface roughness, specific surface area, total pore volume and Langmuir volume, which means TOC can improve the adsorption of shale reservoir in many ways. Pyrite can offer much contribution to the ability of gas adsorption.",
keywords = "Black shales, Northwestern Hunan, Pore microstructure, Fractal dimension, Adsorption ability",
author = "Yanran Huang and Li Dong and Andrew Hursthouse and Junping Huang and Ye Yu and Junping Huang",
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Characterization of pore microstructure and methane adsorption of organic-rich black shales in northwestern Hunan, South China. / Huang, Yanran; Dong, Li; Hursthouse, Andrew; Huang, Junping; Yu, Ye; Huang, Junping.

In: Energy Exploration & Exploitation, Vol. 38, No. 2, 01.03.2020, p. 473-493.

Research output: Contribution to journalArticle

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T1 - Characterization of pore microstructure and methane adsorption of organic-rich black shales in northwestern Hunan, South China

AU - Huang, Yanran

AU - Dong, Li

AU - Hursthouse, Andrew

AU - Huang, Junping

AU - Yu, Ye

AU - Huang, Junping

PY - 2019/9/26

Y1 - 2019/9/26

N2 - The gas adsorption of shale is one of the most important factors influencing shale gas accumulation and production. Different from other shale gas fields, the shale in Northwestern Hunan province with strong structural deformation has especially high portion of adsorbed gas. The adsorption abilities of shale reservoir play a significant role in the success of exploration and production of shale gas in Northwestern Hunan. Therefore, based on many experiments including field emission scanning electron microscopy, N2/CO2 adsorption, excess CH4 adsorption with constant temperature and others, this paper found that: 1) The shale pores were identified with mineral matrix pores, organic matter pores and fracture pores, and the pores can be further classified according to their shape features and forming mechanism; 2) After analyses of the distribution of the pore size, Mesoporous is the largest contributor and widely distributed, and micropores provide more contribution on surface area but limited contribution to pore volume. Meanwhile, depth has little effect on the properties of shale reservoirs; 3) Based on the fractal geometry theory, surface roughness is positively correlated to microstructure irregularity, which means the effects between the gas adsorption by Van der Waals force and by multi-layer or capillary condensation in single pore system are consistent during the N2 adsorption process. 4) The abilities of gas storage are apparently sensitive to the surface roughness of shale pores and non-sensitive to microstructure irregularity. TOC has strong positive correlation with the surface roughness, specific surface area, total pore volume and Langmuir volume, which means TOC can improve the adsorption of shale reservoir in many ways. Pyrite can offer much contribution to the ability of gas adsorption.

AB - The gas adsorption of shale is one of the most important factors influencing shale gas accumulation and production. Different from other shale gas fields, the shale in Northwestern Hunan province with strong structural deformation has especially high portion of adsorbed gas. The adsorption abilities of shale reservoir play a significant role in the success of exploration and production of shale gas in Northwestern Hunan. Therefore, based on many experiments including field emission scanning electron microscopy, N2/CO2 adsorption, excess CH4 adsorption with constant temperature and others, this paper found that: 1) The shale pores were identified with mineral matrix pores, organic matter pores and fracture pores, and the pores can be further classified according to their shape features and forming mechanism; 2) After analyses of the distribution of the pore size, Mesoporous is the largest contributor and widely distributed, and micropores provide more contribution on surface area but limited contribution to pore volume. Meanwhile, depth has little effect on the properties of shale reservoirs; 3) Based on the fractal geometry theory, surface roughness is positively correlated to microstructure irregularity, which means the effects between the gas adsorption by Van der Waals force and by multi-layer or capillary condensation in single pore system are consistent during the N2 adsorption process. 4) The abilities of gas storage are apparently sensitive to the surface roughness of shale pores and non-sensitive to microstructure irregularity. TOC has strong positive correlation with the surface roughness, specific surface area, total pore volume and Langmuir volume, which means TOC can improve the adsorption of shale reservoir in many ways. Pyrite can offer much contribution to the ability of gas adsorption.

KW - Black shales

KW - Northwestern Hunan

KW - Pore microstructure

KW - Fractal dimension

KW - Adsorption ability

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