KEY POINTS
  • Angola's decision to quit the OPEC alliance following a production level row sparked questions over group unity.
  • Analysts downplayed the likelihood of heavyweight producers following suit.
  • Market impact is likely to be limited due to this, and the fact that there will be no immediate effect on global oil production.

Angola's announcement this week that it will quit the oil producers' Organization of the Petroleum Exporting Countries brings to a head longstanding tensions within the powerful group, but market impact is likely to be limited, according to analysts.

The move "did not come as a surprise, [as] the writing was on the wall already last month," Clay Seigle, director of the global oil service at Rapidan Energy Group, told CNBC's "Last Call" on Thursday.