Effect of shear on the development and adsorption capacity of organic pores in shale

YU Yuxi; WANG Zongxiu; FENG Xingqiang; ZHANG Kaixun; ZHANG Linyan

doi:10.12090/j.issn.1006-6616.2020.26.06.065

Volume 26 Issue 6

Dec. 2020

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Article Navigation > Journal of Geomechanics > 2020 > 26(6): 830-839

YU Yuxi, WANG Zongxiu, FENG Xingqiang, et al., 2020. Effect of shear on the development and adsorption capacity of organic pores in shale. Journal of Geomechanics, 26 (6): 830-839. DOI: 10.12090/j.issn.1006-6616.2020.26.06.065

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Effect of shear on the development and adsorption capacity of organic pores in shale

doi: 10.12090/j.issn.1006-6616.2020.26.06.065

YU Yuxi^{1, 2, 3
,},
WANG Zongxiu^{1, 2, 3
,
,},
FENG Xingqiang^{1, 2, 3},
ZHANG Kaixun^{1, 2, 3},
ZHANG Linyan^{1, 2, 3}

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China
3.
Key Laboratory of Petroleum Geomechanics, China Geological Survey, Beijing 100081, China

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Received: 2020-08-20
Revised: 2020-10-15
Published: 2020-12-01

Abstract

Abstract

Organic pore is the most important type of storage space for adsorbed gas and free gas in highly mature shale reservoirs. The marine shale formations in South China experienced complex structural deformations and the detachment structures widely developed. To investigate the effect of shear-induced deformation on the microscopic structure and adsorption capacity of organic pores in shale,the lower Cambrian Niutitang shales in the Sancha outcrop in Zhangjiajie were taken as an example. Based on scanning electron microscope observations and statistical parameter analysis of pore images,the development characteristics of organic pores from the detachment belt,the near-by detachment belt and the far-away detachment belt were compared. The methane isothermal adsorption tests were also carried out on the three types of samples. The results show that the pores developed within the organic matters have dominant pore sizes less than 20 nm and the organic matter-mineral related pores have larger pore sizes and mainly developed in the organic matter encapsulating mineral fragments in the detachment belt. The organic pores experienced directional elongation and flattening under shear. The adsorption capacity of shales decreased under shear and the degree of such influence gradually decreased as the distance from the detachment belt increased. The shear has an important controlling effect on shale storage and gas-bearing capacity,which is significant to the understandings on shale gas preservation conditions and accumulation patterns.
- shale,
- detachment structure,
- organic pore,
- microscopic characteristics,
- pore structure,
- adsorption capacity

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Effect of shear on the development and adsorption capacity of organic pores in shale

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Effect of shear on the development and adsorption capacity of organic pores in shale

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