Sour crude oil Created OnJanuary 12, 2018byCult of Sea Print You are here: Glossary S Sour crude oil < Back to Glossary IndexA crude oil containing appreciable amounts of hydrogen sulphide and/or mercaptans. Related:Hydrocarbon GasCrude Oil WashingDreadage or Dreading ClauseArrived shipFree in and out (FIO)Phase (Oil Phases)