The Strategic Petroleum Reserve (SPR) is a separate entity from what was the Naval Reserves, both physically and conceptually.
The SPR is crude that has already been produced from a field and the water & gas separated out. It is stored in Salt Dome Caverns and can be withdrawn at 4.4 MMBPD, IIRC.
The Naval Reserves, including the Elk Hills Oil Field that was bought by Oxy, were geological formations that should be good production areas, but were not actually in production in the time. They were true oil fields with little drilling done.
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