4D Anadarko CO2 CO2 and brine leakage CO2 leakage CO2 migration CO2 sequestration CO2-EOR CO2-WAG CO2-enhanced oil recovery EOR Farnsworth Farnsworth Field Farnsworth Unit GEM Monte Carlo NRAP Physics Research & information: general STOMP TOUGHREACT WAG anthropogenic CO2 caprock integrity carbon dioxide storage carbon sequestration carbon storage early detection criteria enhanced oil recovery with CO2 (CO2-EOR) expectation curve