- Distributors (69)
(those companies involved in the ditribution and wholesale/retail sale of oil, gas,
petroleum goods and lubricants etc.).
- E Commerce (16)
- Exploration and Production (90)
(those involved in exploration, production and development of oil and gas fields)
- Processing (4)
(companies which conduct oil and gas processing and refining)
- Refining (4)
- Service Companies (239)
(those companies which provide services, equipment, technical staff and information etc.
to the operating companies)