Oil exploration is ongoing offshore in the Black Sea (the Shabla block) and on the Romanian border, but Bulgaria's chief oil income is likely to come as a transfer point on east-west and north-south transit lines.
石油勘探在黑海（Shabla区）和罗马尼亚边界近海进行，但保加利亚的主要石油收入有可能作为东西南和南北运输线的转移点。