Comprehensive Review of CO₂ Adsorption on Shale Formations: Exploring Widely Adopted Isothermal Models and...

Area of Science:

• Geochemistry and Environmental Science
• Petroleum Engineering and Carbon Sequestration

Background:

• Fossil fuel combustion releases significant carbon dioxide (CO2), a primary driver of global warming.
• Shale formations offer potential for CO2 sequestration, primarily via gas adsorption.
• Accurate CO2 adsorption modeling in shale is crucial for effective storage capacity estimation.

Purpose of the Study:

• To evaluate the performance of various isothermal models in predicting CO2 adsorption on shale.
• To assess model efficiency across diverse shale compositions, surface areas, and pore geometries.
• To identify limitations of current models and propose enhancements for improved accuracy.

Main Methods:

• Application and comparison of multiple isothermal adsorption models (Langmuir, Freundlich, BET, DR, DA, Sips, Toth, Ono-Kondo).
• Analysis of CO2 adsorption on shale samples at 298 K and up to 2 MPa.
• Review of model constraints and proposal of adaptations like density-dependent corrections and hybrid techniques.

Main Results:

• The study provides a comprehensive assessment of existing isothermal models for CO2 adsorption on shale.
• Identified limitations in current models necessitate further refinement for precise storage predictions.
• Proposed adaptations and integration with molecular dynamics simulations can enhance predictive accuracy.

Conclusions:

• Accurate forecasting of CO2 storage in shale requires improved isothermal models and empirical validation.
• Future research should focus on model enhancement and integration with advanced simulation techniques.
• Optimized CO2 sequestration in shale formations is key to mitigating greenhouse gas emissions.