[crusty old prospector]

Has any oil ever been discovered isolated in solid, non-porous rock?

Very little unless it is fractured. Mostly in the Texas Panhandle and Australia but they have conventional reservoirs overlying the tombstone.

[blackpacific]

What about the recent discovery of oil off Florida by BP? Here is the article: http://www.dailymail.co.uk/news/worldnews/article-1210691/BP-strikes-giant-oil-Gulf-Mexico.html

According to the article, they must have drilled 30,000feet through the crust to get to it. If it is from plants and animals, how did it get that far under the crust, expecially if it is so light to begin with?