Petroleum 15 : Oil or gas obtained from the rocks of the earth by drilling down into a reservoir rock and piping them to the surface. See Hydrocarbon. (ITOGP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}