
Don’t know. Oil is known to seep out of the ground and perhaps the only place it is noticed is road since that’s where people actually transit. A few cracks on the aging asphalt and a semi truck pressing down on or underneath while driving on top could easily force it out the cracks.
Well, no one wants their oil. It’s very low grade and the only country really equipped to refine the stuff is the US, which is not really interested in trading with them.