非常规储层压裂后CO₂利用与地质封存研究

 

工程（英文） ›› 2025, Vol. 48 ›› Issue (5) : 92-106.

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工程（英文） ›› 2025, Vol. 48 ›› Issue (5) : 92-106. DOI: 10.1016/j.eng.2025.01.005
Article

 非常规储层压裂后CO₂利用与地质封存研究

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CO2 Utilization and Geological Storage in Unconventional Reservoirs After Fracturing

  • Jinzhou Zhaoa,b, Lele Wanga, Bing Weia,b,*, Valeriy Kadetc
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Abstract

Cyclic injection holds great potential for CO2 emission reduction coupled with enhanced unconventional oil recovery. There is, however, a lack of a thorough understanding of carbon distribution, migration, and transformation underground over time at the reservoir scale. To address this issue, we conducted a rigorous numerical simulation integrating microseismic events, multi-geomechanics, and multi-geochemistry to represent the complex fracture geometry, rock stress sensitivity, and CO2-oil-brine-rock interactions. The fluid model, reservoir model, and geochemical reaction kinetics were carefully validated and calibrated using experimental data. The performance of CO2 utilization and geological storage was comprehensively investigated in terms of changes in oil production, CO2 storage, carbon distribution, and petrophysical properties. The results indicate that 48.3% of the injected CO2 was stored stably underground after ten cycles (ten years), with a 3.4% increase in oil recovery. The presence of multiple CO2 storage forms, such as dissolved in water and mineralized carbonate, impeded CO2-oil interaction, leading to a 25.9% reduction in the volume of the CO2-oil mixing zone and a 2.2% decrease in cumulative oil production, albeit with a 7.7% increase in the storage rate. The cyclic injection mode had a significant impact on the migration and transformation of CO2 in the reservoir. While dissolved CO2 in oil accounted for over half of the total storage, it had the possibility of being released during production. After ten cycles, 20% of the injected CO2 (approximately 12 000 t) reached long-term storage in four forms: mineralized carbonate (6%), water-dissolved CO2 (6%), aqueous ions (4%), and trapped gas (4%). Notably, the non-fracture zone within the stimulated reservoir volume (SRV) served as the primary trapping area for residual gas. This work provides valuable insights into dynamic CO2 transport and transformation processes under cyclic injection and presents a more comprehensive and precise framework for assessing CO2 capture, utilization, and storage with enhanced oil recovery (CCUS-EOR) performance in unconventional reservoirs after fracturing.

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Keywords

CO2 utilization and geological storage / Cyclic injection / Unconventional reservoir / Carbon distribution, migration, and transformation / Emission reduction

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.  非常规储层压裂后CO₂利用与地质封存研究. Engineering. 2025, 48(5): 92-106 https://doi.org/10.1016/j.eng.2025.01.005

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