(A) Microscopic view of pores (blue areas) from the limestone reservoir rock at Aneth field;

(B) schematic microscopic view of pores containing water (brine) and unproduced oil;

(C) same diagram, now showing injected CO₂ and now-mobile oil mixed with CO₂;

(D) carbon dioxide stored as a gaseous state and dissolved in brine.

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Graphics courtesy of Utah Geological Survey