The demands are the first sign of dissent at the 315,000-barrels-per-day (bpd) field in southern Libya since it reopened this month.
State guards and tribesmen had closed Sharara in December in an apparently successful attempt to clinch salary payments and development funds.
Workers at two other fields also posted pictures that show them demanding a pay increase, calling their movement “Sabaa Wa Steen”, the Arabic word for 67.
