Figure 4.
The image features a diagram depicting two sections, each showing gas flow represented by arrows pointing upward. On the left side, there are large-aperture fissures indicated to be greater than forty micrometres, highlighted with bold red text. This section shows pronounced red lines representing these fissures. On the right, low-aperture fissures are noted to be between two and forty micrometres, marked in pink text. The fissures here are illustrated as narrower lines and less prominent compared to the left side. The background is grey, and dashed lines create a sense of texture, providing context for the fissures' arrangement.Schematic representation of gas pathways in Boom Clay during gas injection in oedometric conditions. Gas evolves along bedding planes by forming large aperture fissures and jump from one bedding plane to another by forming bridging planes (low aperture fissures) (from Gonzalez-Blanco et al., 2023)