Figure 15.
The image shows two graphs labelled as a and b. Graph a presents the change of saturation degree designated as delta S w plotted against the change of porosity labelled as delta phi. The x axis ranges from negative 0.1 to positive 0.1, while the y axis ranges from negative 0.3 to positive 0.3. Three distinct lines represent suction levels of 1.0, 3.0, and 5.0 mega pascals, with the curve for 5.0 mega pascals being the most distinct. A vertical red dashed line indicating a porosity point of 0 is positioned at the x axis centre. Graph b examines the change of gas relative permeability indicated as delta K r g against the same porosity change. The x axis exhibits the same range as in graph a, while the y axis extends from negative 0.2 to positive 0.10. This graph also features three curves corresponding to the varying suction levels, illustrating diverging behaviours as porosity changes. Both graphs use consistent formatting to present data without overlapping elements.Effects of porosity on gas transport properties: (a) relationship between changes in porosity and changes in saturation degree; (b) relationship between changes in porosity and changes in gas relative permeability