The EU decision to lift Syrian oil sanctions to aid the opposition has accelerated a scramble for control over wells and pipelines in rebel-held areas and helped consolidate the grip of jihadist groups over the country’s key resources.
Jabhat al-Nusra, affiliated with al-Qaida and other extreme Islamist groups, control the majority of the oil wells in Deir Ezzor province, displacing local Sunni tribes, sometimes by force. They have also seized control of other fields from Kurdish groups further to the north-east, in al-Hasakah governorate.
http://www.guardian.co.uk/world/2013/may/19/eu-syria-oil-jihadist-al-qaida