Thin section of a sandstone (image width approx. 2 mm).

Thin section of a sandstone (image width approx. 2 mm). During geological storage, the pore space of the reservoir rock (here in blue) is largely filled with CO2.
Thin section of a sandstone (image width approx. 2 mm). During geological storage, the pore space of the reservoir rock (here in blue) is largely filled with CO2.