Experimental Study of CO₂ and CH₄ Adsorption-Desorption Behavior in Reservoir Rocks: A Case of Study from ANH-Cañaboba1 Well

This work presents an experimental study of CH₄ and CO₂ adsorption behavior on two shale rock samples from ANH-Cañaboba1 Well in the Cesar-Ranchería Basin, Colombia. Gas adsorption and desorption experiments were conducted at 50°C and 80°C across a broad pressure range (0,1 – 3 MPa) using a high-pressure manometric system. The resulting isotherms were satisfactorily fitted to the Langmuir model. Results indicate higher adsorption capacity for CO₂ at both temperatures. Notably, no hysteresis was observed, suggesting reversible physisorption dominated by accessible mesopores which the typical behavior observed in shales samples. The results highlight the key role of organic matter in gas storage and underscore the formation’s potential for CO₂ sequestration and enhanced gas recovery. This study provides an improved understanding of evaluating gas-in-place and potential for long-term gas storage and provides an experimental framework and valuable data for future research and field applications related to gas behavior in porous media.