BP and Shell have been forced on the defensive by new allegations of price-rigging made in a US lawsuit brought by four oil traders.
BP is at the centre of one of the world's biggest gas sales agreements, worth up to $100bn (£62bn) over 25 years, after signing a deal to supply energy from a Caspian Sea project that could reduce Europe's reliance on Russian fossil fuels.
Shell always appoints its chief executives from inside, so nobody should be surprised it has done so again.
One of the largest shareholders in Gulf Keystone Petroleum (GKP) has slammed the oil firm for its poor corporate governance and "excessive" executive pay.
Even 25 years on, Charles Haffey's most powerful memory of the Piper Alpha disaster was the overwhelming, deafening noise. The vast inferno created by simultaneous eruptions from ruptured gas and crude oil pipelines sounded like thousands of blow torches alight at full pressure.
Safety on North Sea oil platforms is being compromised because the workforce is scared to speak out, a three-day conference to mark the 25th anniversary of Britain's worst offshore accident will be told on Tuesday.
The government has so far failed to introduce measures from Brussels to crack down on oil and gas market abuse more than 18 months after it was told to and despite a flurry of price-fixing claims.
BP, Shell and other big oil companies have been raided by European commission officials investigating allegations they "colluded" to rig oil prices.
Royal Dutch Shell is pressing ahead with the world's deepest offshore oil and gas production facility by drilling almost two miles underwater in the politically sensitive Gulf of Mexico.
Peter Voser, the chief executive of Shell, has announced plans to stand down less than four years into the job.