http://inspire.ec.europa.eu/codelist/FossilFuelValue/oilShalesINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 17:29 PM CEST2015-08-18 17:29 PM CESToil shalesOil shale, also known as kerogen shale, is an organic-rich fine-grained sedimentary rock containing kerogen (immature hydrocarbons).It includes both non-associated gas originating from fields producing hydrocarbons only in gaseous form, and associated gas produced in association with crude oil as well as methane recovered from coal mines (coal mine methane) or from coal seams (coal seam gas).