Upstream understands Chevron was to hold a meeting this week to outline appraisal plans for the discovery made late last year in Mississippi Canyon Block 166. Plans could include a sidetrack off the original well bore, a source said.

Chevron declined to comment on its plans. The US supermajor operates Mississippi Canyon 166 with a 75% stake. US independent Murphy Oil farmed in to the prospect with a 25% stake late last year.