How were the caverns created?
Salt caverns are carved out of underground salt domes by a process called “solution mining.” Essentially, the process involves drilling a well into a salt formation, then injecting massive amounts of fresh water. The water dissolves the salt. In creating the SPR caverns, the dissolved salt was removed as brine and either reinjected into disposal wells or more commonly, piped several miles offshore into the Gulf of Mexico. By carefully controlling the pressure and direction of the freshwater injection process, salt caverns of very precise dimensions can be created.
