Ok I understand that, but these pores within these rocks have to be large and if oil miners are pumping steam into these pores wouldn't that leave for lack of a better word holes? I guess what I'm getting at is possible collapses with the tectonic plates constantly moving. it's hard to believe...
As we have so many oil mines around the world, how large are these holes left behind, and what is put in place of the oil that is taken out. wouldn't the pressure be different? and what would happen if a oil cavern collapsed?