OIL+SHALE

Shale oil extraction is an industrial process for [|unconventional oil] production. This process converts [|kerogen] in [|oil shale] into [|shale oil] by [|pyrolysis], [|hydrogenation] , or [|thermal dissolution]. The resultant shale oil is used as fuel oil or [|upgraded] to meet [|refinery] [|feedstock] specifications by adding [|hydrogen] and removing [|sulfur] and [|nitrogen] [|impurities]. Shale oil extraction is usually performed above ground (//ex situ// processing) by mining the oil shale and then treating it in [|processing facilities]. Other modern technologies perform the processing underground (on-site or // [|in situ] // processing) by applying heat and extracting the oil via [|oil wells].
 * OIL SHALE**

Shale oil may be cheap to produce but it is extremely polluting and inefficient