Re-evaluation of CO2 storage capacity of depleted fractured-vuggy carbonate reservoir

Jizhou Tang; Zhuo Zhang; Jun Xie; Siwei Meng; Jianchun Xu; Christine Ehlig-Economides; He Liu

doi:10.59717/j.xinn-energy.2024.100019

The Innovation Energy > 2024 Vol. 1 > No. 2 > 100019

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Re-evaluation of CO₂ storage capacity of depleted fractured-vuggy carbonate reservoir

1.
School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
2.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
3.
China National Petroleum Corporation, Beijing 100007, China
4.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
5.
National Key Laboratory of Continental Shale Oil, Daqing 163002, China
6.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
7.
Cullen College of Engineering, University of Houston, Houston 77204, United States

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Corresponding authors: xiejun01@petrochina.com.cn (J.X.); mengsw@petrochina.com.cn (S.M.)
Received Date: September 12, 2023

Accepted Date: February 03, 2024

Published Online: April 26, 2024

The Innovation Energy 1(2), https://doi.org/10.59717/j.xinn-energy.2024.100019 | Cite this article

GRAPHICAL ABSTRACT

GRAPHICAL ABSTRACT

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PUBLIC SUMMARY

PUBLIC SUMMARY
1. In carbonate reservoirs, dissolved caves provide more storage space for CO₂ than other voids.
  
  Carbonate reservoirs can dissolve 13~62 times and mineralize 1 time more of CO₂ than saline aquifers.
  
  The annual storage capacity per well of carbonate reservoirs and saline aquifers are comparable.
  
  The minimum unit storage capacity of CO₂ for carbonate reservoirs is around 4 times that of saline aquifers.

ABSTRACT

ABSTRACT

Confronting the dual crises of energy supply-demand imbalances and climate change, carbon neutrality emerges as a vital strategy for China in mitigating resource and environmental constraints, while fostering technological advancement and sustainable growth. In the context of extensive hydrocarbon exploitation, the CO₂ storage capacity within depleted oil fields could be significantly underestimated in comparison to the prevalent practice of saline aquifer sequestration. In this study, we employ both theoretical and computational models to investigate the temporal (from microseconds to millennia) and spatial (spanning pore, Darcy, and hybrid scales) dynamics of CO₂ trapping mechanisms in post-depletion carbonate reservoir with fractured-vuggy systems. The multiscale storage efficiency factor is obtained from simulation results and substituted into the existing analytical models for calculating CO₂ storage volume in field cases, reappraising the carbon sequestration potential of fracture-vuggy carbonate. Drawing from comparative results, we discern that depleted carbonate can dissolve and mineralize more CO₂ than saline layer, despite the storage volume can be considerably less. The annual storage capacity per well of two geological systems are comparable. Under unfavorable geological conditions, the minimum unit storage capacity of carbonate reservoir exceeds that of saline aquifer. The study's discoveries offer fresh perspectives on reliable and efficient CO₂ geological storage, contributing to the reduction of atmospheric carbon emissions and advancing the utilization of underground resources and global energy transformation.

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Tang J., Zhang Z., Xie J., et al., (2024). Re-evaluation of CO2 storage capacity of depleted fractured-vuggy carbonate reservoir. The Innovation Energy 1(2): 100019. https://doi.org/10.59717/j.xinn-energy.2024.100019

Tang J., Zhang Z., Xie J., et al., (2024). Re-evaluation of CO₂ storage capacity of depleted fractured-vuggy carbonate reservoir. The Innovation Energy 1(2): 100019. https://doi.org/10.59717/j.xinn-energy.2024.100019

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Re-evaluation of CO₂ storage capacity of depleted fractured-vuggy carbonate reservoir