How is shale oil produced?
Oil shale is processed through high-temperature heating into shale oil, an oil similar to petroleum. The processing can take place either above ground in retorts once the oil shale has been extracted (ex-situ process) or it can be done more slowly while the oil shale is still underground (in-situ process). In-situ processing allows for fewer waste products, lesser land impact and a smaller amount of water are required for the process.
