Natural Petroleum Pollution?

[ESFP]

Why doesn't the 1.2 trillion barrels of Earth's untapped petroleum eventually contaminate the soil and water? I'd think that, after millions of years, the oil would have seeped into the ocean water and soil and we'd be saturated with oil soaked land. "Then one day he was shootin at some food, and up through the ground came a bubblin'crude" (Beverly Hillbillies).

[Tek_Freek]

The oil that wasn't trapped in pockets did that many, many, many years ago. The oil that is left is still trapped which is why it's there for us to get.