If a 1995 Mercury mini-van is leaking oil from around the pulleys that come out of the engine is this just a gasket?

More information would be helpful. Engine size, and if it looks like it's leaking from one pulley or several? My first thought is that the front seal is leaking around the crankshaft pulley. Other oil leak sources are the timing cover, the valve cover(s), or even a cracked cylinder head, could let oil trickle down and get slung around by the pulleys. What's the highest point of the engine that looks like oil is leaking around? Either way, it should be repaired.