How about all the old texas fields that made america the nation it once was? They are all but empty, that's why you're drilling in the gulf of Mexico under a mile or water.
Let me explain to you.
In the early days of the Cold War when an isolated Soviet Union tasked their top scientists to identify the actual source of oil. Not a weekend homework assignment. After considerable research, in 1956, Russian scientist Professor Vladimir Porfir'yev announced that "crude oil and natural petroleum gas have no intrinsic connection with biological matter originating near the surface of the earth. They are primordial [originating with the earth's formation] materials which have been erupted from great depths."
If your eyeballs didn't fall out when you read that, you might want to read it again.
He said oil doesn't come from anything biologic, not, as conventional wisdom dictates, from the fossilized remains of dinosaurs and/or ancient plant matter. It comes from very deep in the earth and is created by a biochemical reaction that subjected hydrocarbons (elements having carbon and hydrogen) to extreme heat and intense pressure during the earth's formation.
Russians referred to this oil (any oil, really) as "abiotic oil" because it is not created from the decomposition of biological life forms, but rather from the chemical process continually occurring inside the earth.
I know, easy for Porfir'yev to say. But it turns out it was more than just a theory. It's been proven correct, time and time again.
Because shortly after the Russians discovered this, they started drilling ultra-deep wells and finding oil at 30,000 and 40,000 feet below the earth's surface. These are staggering depths, and far below the depth at which organic matter can be found, which is 18,000 feet.