Oil is created from the pressurized remains of ancient ocean dwelling animals. Over the course of millions of the years, the dead remains of the animals accumulated under many layers of sedimentary rock. As the pressure of the rock layers builds they gradually transform the animal remains into oil shale which, today, is harvested for use by humans.
Simply put, areas with high amounts of oil were most likely ancient ocean floors where high volumes of animal remains accrued. Areas that do not have oil were probably never under water.
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