what is shale
Shale is a compressed fine-grained type of sedimentary rock. It was formed from mud silt, clay, and organic matter. Shale gas is natural gas trapped within tiny pore spaces in shale formations. It is a hydrocarbon gas mixture. It consists mainly of methane. Other hydrocarbons are natural gas liquids (NGLs) like ethane, propane, and butane, and it also contains carbon dioxide, nitrogen, and hydrogen sulfide.