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Carbon capture and sequestration and CO2 enhanced oil recovery in the Temblor Formation Sandstones at McKittrick oil field, San Joaquin Valley, California
Depleting oil and gas fields are ideal storage sites for atmospheric carbon dioxide because of their large capacities and proven ability to retain fluids for millions of years. In addition, the CO2, when injected at depths greater than 3000 feet, can increase recovery of remaining oil in place by an additional 10% - 20% of the original oil in place (OOIP). This research investigates the possibility of carbon capture and sequestration (CCS) in the Phacoides member of the Temblor Formation in the McKittrick oil field located in the San Joaquin Valley of California. The Phacoides reservoir has produced 71.5 MMRB (million reservoir barrels) of fluid equivalent to approximately 5.8 million tons of CO2. Through CO2 EOR an additional 17 MMBO (million barrels of oil) may be recoverable, thereby offsetting the cost of CCS. Faulting has compartmentalized the reservoir into at least six separate fault blocks requiring at least five separate injection wells in order to fill each of the blocks. The presence of faulting also increases the risk of CO2 leakage. Pressure analysis also revealed the presence of a weak water drive which will fill some of the vacated pore space available for CO2 sequestration—especially along the flanks of the structure.
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