Micropore inhomogeneity of continental shale under different side length and resolution: a case study of Chang 7<sup>2</sup> shale from well Yaoke 1 in Ordos Basin

SHANG Yanjun; ZHAO Bin; HU Ruilin; SHAO Peng

doi:10.11781/sysydz202001156

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SHANG Yanjun, ZHAO Bin, HU Ruilin, SHAO Peng. Micropore inhomogeneity of continental shale under different side length and resolution: a case study of Chang 72 shale from well Yaoke 1 in Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(1): 156-162. doi: 10.11781/sysydz202001156

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SHANG Yanjun, ZHAO Bin, HU Ruilin, SHAO Peng. Micropore inhomogeneity of continental shale under different side length and resolution: a case study of Chang 7² shale from well Yaoke 1 in Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(1): 156-162. doi: 10.11781/sysydz202001156

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Micropore inhomogeneity of continental shale under different side length and resolution: a case study of Chang 7² shale from well Yaoke 1 in Ordos Basin

doi: 10.11781/sysydz202001156

SHANG Yanjun^{1, 2
,},
ZHAO Bin³,
HU Ruilin^{1, 2},
SHAO Peng^{1, 2}

1.
Key Laboratory of Shale Gas and Geological Engineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Exploration and Development Research Institute, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China

Received Date: 2019-07-22
Rev Recd Date: 2019-12-01
Publish Date: 2020-01-28

Abstract

Abstract

Continental shale is different from marine shale due to its inhomogeneity, which is apparent mainly in the inhomogeneity of pore structure. The Upper Triassic Yanchang black shale (Chang 7²) samples were collected from the well Yaoke 1 in the Ordos Basin. Micro and nano CT were used to observe and analyze the pores and cracks of 7 different side lengths (100-700 μm) and 4 different side lengths (10-39 μm) at 1 μm and 65 nm resolutions, respectively. The spatial inhomogeneity index of different side lengths and resolutions based on 3D image reconstruction was established. It was found that the number and volume of pores increased exponentially with the increase of side lengths, while the plane density of the pores decreased with the increase of side lengths. The average length, width and their ratio remained basically unchanged. Coordination number, as an indicator of connectivity, is closely related to the average width of pores.
- micropore,
- block side length,
- plane density of pores,
- ratio of pore length with width,
- Yanchang shale,
- Ordos Basin

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References(17)

References

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Micropore inhomogeneity of continental shale under different side length and resolution: a case study of Chang 7² shale from well Yaoke 1 in Ordos Basin

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Micropore inhomogeneity of continental shale under different side length and resolution: a case study of Chang 72 shale from well Yaoke 1 in Ordos Basin

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Micropore inhomogeneity of continental shale under different side length and resolution: a case study of Chang 7² shale from well Yaoke 1 in Ordos Basin