Spain’s Repsol, the UK’s BP and Italy’s Eni all have key acreage on both sides of Algeria’s border with Libya, as does Algerian state firm Sonatrach. With IOCs considering a return to Libyan exploration, will they also look anew at the potential for cross-border synergies?

Spain’s Repsol is considering a 2019 final investment decision at its Southeast Illizi block in Algeria’s remote southeast.

“It will be our target to analyze the possibility to...