Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield

Wang Xixi; Meng Yue; Li Yongfeng; Hu Guilin

doi:doi:10.11648/j.sd.20251302.11

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Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield

Wang Xixi^*, Meng Yue, Li Yongfeng, Hu Guilin

Published in Science Discovery (Volume 13, Issue 2)

Received: 7 March 2025 Accepted: 27 March 2025 Published: 31 March 2025

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Abstract

This study presents a comprehensive investigation of the pore-throat characteristics in the Chang 9 tight sandstone reservoir of Ansai Oilfield, Ordos Basin, utilizing an integrated multiscale characterization approach. By combining image-based pore analysis, high-pressure and rate-controlled mercury intrusion porosimetry, nuclear magnetic resonance (NMR) relaxation spectroscopy, and nano-CT three-dimensional reconstruction, we established a complete pore-throat characterization methodology spanning multiple scales.The experimental results demonstrate that the reservoir exhibits a bimodal pore-throat distribution, with an average two-dimensional pore radius of 21.51 μm. The three-dimensional pore-throat network is characterized by predominant throat sizes of 0.15 μm (ranging 0.006-1 μm) and pore sizes of 120 μm (60-270 μm). NMR analysis reveals that the lower threshold radius for movable fluids ranges from 0.88 to 8.94 μm, showing significant positive correlation with reservoir quality parameters.A well-developed microfracture network with apertures of 0.07-4.80 μm was identified, which substantially enhances the reservoir's flow capacity. The successful integration of multiple characterization techniques enables complete pore-throat structure characterization across all relevant scales in tight sandstone reservoirs.These findings provide both theoretical foundations and practical guidance for sweet spot identification, reservoir evaluation, and hydrocarbon exploration/development in tight sandstone formations. The established methodology offers valuable insights for understanding fluid storage and flow mechanisms in low-permeability reservoirs.

Published in	Science Discovery (Volume 13, Issue 2)
DOI	10.11648/j.sd.20251302.11
Page(s)	16-24
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Pore-throat Structure, Mercury Intrusion Capillary Pressure (MICP), Nuclear Magnetic Resonance (NMR), CT Examination, Ansai Oilfield

References

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APA Style

Xixi, W., Yue, M., Yongfeng, L., Guilin, H. (2025). Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield. Science Discovery, 13(2), 16-24. https://doi.org/10.11648/j.sd.20251302.11

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ACS Style

Xixi, W.; Yue, M.; Yongfeng, L.; Guilin, H. Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield. Sci. Discov. 2025, 13(2), 16-24. doi: 10.11648/j.sd.20251302.11

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AMA Style

Xixi W, Yue M, Yongfeng L, Guilin H. Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield. Sci Discov. 2025;13(2):16-24. doi: 10.11648/j.sd.20251302.11

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@article{10.11648/j.sd.20251302.11,
  author = {Wang Xixi and Meng Yue and Li Yongfeng and Hu Guilin},
  title = {Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield
},
  journal = {Science Discovery},
  volume = {13},
  number = {2},
  pages = {16-24},
  doi = {10.11648/j.sd.20251302.11},
  url = {https://doi.org/10.11648/j.sd.20251302.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sd.20251302.11},
  abstract = {This study presents a comprehensive investigation of the pore-throat characteristics in the Chang 9 tight sandstone reservoir of Ansai Oilfield, Ordos Basin, utilizing an integrated multiscale characterization approach. By combining image-based pore analysis, high-pressure and rate-controlled mercury intrusion porosimetry, nuclear magnetic resonance (NMR) relaxation spectroscopy, and nano-CT three-dimensional reconstruction, we established a complete pore-throat characterization methodology spanning multiple scales.The experimental results demonstrate that the reservoir exhibits a bimodal pore-throat distribution, with an average two-dimensional pore radius of 21.51 μm. The three-dimensional pore-throat network is characterized by predominant throat sizes of 0.15 μm (ranging 0.006-1 μm) and pore sizes of 120 μm (60-270 μm). NMR analysis reveals that the lower threshold radius for movable fluids ranges from 0.88 to 8.94 μm, showing significant positive correlation with reservoir quality parameters.A well-developed microfracture network with apertures of 0.07-4.80 μm was identified, which substantially enhances the reservoir's flow capacity. The successful integration of multiple characterization techniques enables complete pore-throat structure characterization across all relevant scales in tight sandstone reservoirs.These findings provide both theoretical foundations and practical guidance for sweet spot identification, reservoir evaluation, and hydrocarbon exploration/development in tight sandstone formations. The established methodology offers valuable insights for understanding fluid storage and flow mechanisms in low-permeability reservoirs.
},
 year = {2025}
}

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TY  - JOUR
T1  - Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield

AU  - Wang Xixi
AU  - Meng Yue
AU  - Li Yongfeng
AU  - Hu Guilin
Y1  - 2025/03/31
PY  - 2025
N1  - https://doi.org/10.11648/j.sd.20251302.11
DO  - 10.11648/j.sd.20251302.11
T2  - Science Discovery
JF  - Science Discovery
JO  - Science Discovery
SP  - 16
EP  - 24
PB  - Science Publishing Group
SN  - 2331-0650
UR  - https://doi.org/10.11648/j.sd.20251302.11
AB  - This study presents a comprehensive investigation of the pore-throat characteristics in the Chang 9 tight sandstone reservoir of Ansai Oilfield, Ordos Basin, utilizing an integrated multiscale characterization approach. By combining image-based pore analysis, high-pressure and rate-controlled mercury intrusion porosimetry, nuclear magnetic resonance (NMR) relaxation spectroscopy, and nano-CT three-dimensional reconstruction, we established a complete pore-throat characterization methodology spanning multiple scales.The experimental results demonstrate that the reservoir exhibits a bimodal pore-throat distribution, with an average two-dimensional pore radius of 21.51 μm. The three-dimensional pore-throat network is characterized by predominant throat sizes of 0.15 μm (ranging 0.006-1 μm) and pore sizes of 120 μm (60-270 μm). NMR analysis reveals that the lower threshold radius for movable fluids ranges from 0.88 to 8.94 μm, showing significant positive correlation with reservoir quality parameters.A well-developed microfracture network with apertures of 0.07-4.80 μm was identified, which substantially enhances the reservoir's flow capacity. The successful integration of multiple characterization techniques enables complete pore-throat structure characterization across all relevant scales in tight sandstone reservoirs.These findings provide both theoretical foundations and practical guidance for sweet spot identification, reservoir evaluation, and hydrocarbon exploration/development in tight sandstone formations. The established methodology offers valuable insights for understanding fluid storage and flow mechanisms in low-permeability reservoirs.

VL  - 13
IS  - 2
ER  -

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Author Information

Wang Xixi

College of Geology and Environment, Xi 'an University of Science and Technology, Xi 'an, China

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Meng Yue

First Oil Production Plant of Changqing Oilfield, Yan 'an, China

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Li Yongfeng

First Oil Production Plant of Changqing Oilfield, Yan 'an, China

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Hu Guilin

First Oil Production Plant of Changqing Oilfield, Yan 'an, China

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APA Style

Xixi, W., Yue, M., Yongfeng, L., Guilin, H. (2025). Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield. Science Discovery, 13(2), 16-24. https://doi.org/10.11648/j.sd.20251302.11

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ACS Style

Xixi, W.; Yue, M.; Yongfeng, L.; Guilin, H. Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield. Sci. Discov. 2025, 13(2), 16-24. doi: 10.11648/j.sd.20251302.11

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AMA Style

Xixi W, Yue M, Yongfeng L, Guilin H. Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield. Sci Discov. 2025;13(2):16-24. doi: 10.11648/j.sd.20251302.11

Copy | Download

@article{10.11648/j.sd.20251302.11,
  author = {Wang Xixi and Meng Yue and Li Yongfeng and Hu Guilin},
  title = {Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield
},
  journal = {Science Discovery},
  volume = {13},
  number = {2},
  pages = {16-24},
  doi = {10.11648/j.sd.20251302.11},
  url = {https://doi.org/10.11648/j.sd.20251302.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sd.20251302.11},
  abstract = {This study presents a comprehensive investigation of the pore-throat characteristics in the Chang 9 tight sandstone reservoir of Ansai Oilfield, Ordos Basin, utilizing an integrated multiscale characterization approach. By combining image-based pore analysis, high-pressure and rate-controlled mercury intrusion porosimetry, nuclear magnetic resonance (NMR) relaxation spectroscopy, and nano-CT three-dimensional reconstruction, we established a complete pore-throat characterization methodology spanning multiple scales.The experimental results demonstrate that the reservoir exhibits a bimodal pore-throat distribution, with an average two-dimensional pore radius of 21.51 μm. The three-dimensional pore-throat network is characterized by predominant throat sizes of 0.15 μm (ranging 0.006-1 μm) and pore sizes of 120 μm (60-270 μm). NMR analysis reveals that the lower threshold radius for movable fluids ranges from 0.88 to 8.94 μm, showing significant positive correlation with reservoir quality parameters.A well-developed microfracture network with apertures of 0.07-4.80 μm was identified, which substantially enhances the reservoir's flow capacity. The successful integration of multiple characterization techniques enables complete pore-throat structure characterization across all relevant scales in tight sandstone reservoirs.These findings provide both theoretical foundations and practical guidance for sweet spot identification, reservoir evaluation, and hydrocarbon exploration/development in tight sandstone formations. The established methodology offers valuable insights for understanding fluid storage and flow mechanisms in low-permeability reservoirs.
},
 year = {2025}
}

Copy | Download

TY  - JOUR
T1  - Research on Microscopic Pore-throat Structure Characteristics Using Multiple Methods: A Case Study of the Chang 9 Reservoir in Ansai Oilfield

AU  - Wang Xixi
AU  - Meng Yue
AU  - Li Yongfeng
AU  - Hu Guilin
Y1  - 2025/03/31
PY  - 2025
N1  - https://doi.org/10.11648/j.sd.20251302.11
DO  - 10.11648/j.sd.20251302.11
T2  - Science Discovery
JF  - Science Discovery
JO  - Science Discovery
SP  - 16
EP  - 24
PB  - Science Publishing Group
SN  - 2331-0650
UR  - https://doi.org/10.11648/j.sd.20251302.11
AB  - This study presents a comprehensive investigation of the pore-throat characteristics in the Chang 9 tight sandstone reservoir of Ansai Oilfield, Ordos Basin, utilizing an integrated multiscale characterization approach. By combining image-based pore analysis, high-pressure and rate-controlled mercury intrusion porosimetry, nuclear magnetic resonance (NMR) relaxation spectroscopy, and nano-CT three-dimensional reconstruction, we established a complete pore-throat characterization methodology spanning multiple scales.The experimental results demonstrate that the reservoir exhibits a bimodal pore-throat distribution, with an average two-dimensional pore radius of 21.51 μm. The three-dimensional pore-throat network is characterized by predominant throat sizes of 0.15 μm (ranging 0.006-1 μm) and pore sizes of 120 μm (60-270 μm). NMR analysis reveals that the lower threshold radius for movable fluids ranges from 0.88 to 8.94 μm, showing significant positive correlation with reservoir quality parameters.A well-developed microfracture network with apertures of 0.07-4.80 μm was identified, which substantially enhances the reservoir's flow capacity. The successful integration of multiple characterization techniques enables complete pore-throat structure characterization across all relevant scales in tight sandstone reservoirs.These findings provide both theoretical foundations and practical guidance for sweet spot identification, reservoir evaluation, and hydrocarbon exploration/development in tight sandstone formations. The established methodology offers valuable insights for understanding fluid storage and flow mechanisms in low-permeability reservoirs.

VL  - 13
IS  - 2
ER  -

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