The residual gas was developed in the form of pockets in the marble, coarse grain limestone (fr6) and granite cases. The rock type impact on the displacement pattern is critically important in water–gas displacement cases. The material type (that could be interpreted as the wettability effect as well) did not show any critical effect.
When an extra load is applied to the model that eventually reduced the aperture and yielded a certain degree of closure, a more uniform distribution is observed in the lateral direction and the displacement is more ‘‘frontal’’ (the lower images) than the no-load case (the upper images). However, the displacement pattern at the end and the residual gas saturation type and the amounts are very similar.