Every now and then you see a simple picture that fills in a lot of blanks. The link below is a graphic representation of how North Dakota would look if the oil wells ACTUALLY drilled in the state were above ground instead of below. Makes me wonder what the plan is when the wells are fully depleted. Otherwise it is quite an impressive visual of what is below the ground.
http://www.nytimes.com/interactive/2014/11/24/upshot/nd-oil-well-illustration.html
