Study on Competitive Adsorption and Displacing Properties of CO₂ Enhanced Shale Gas Recovery: Advances and Challenges

Figure 3

Adsorption isotherm (excess sorption vs. pressure) for (a) CH₄ and (b) CO₂ on crushed dry shale samples of the Parana Basin in Brazil at a temperature of 45°C [29].

(a)

(b)