After the oil spill, marine microbes consumed the oil under the surface but also removed Oxygen from the water, killing both plants and animals and creating dead zones.
Organic material, primarily sedimentary deposits on the seafloor, is what turns into oil and gas over the course of millions of years as it decomposes and changes. Recoverable oil and gas deposits may be found where source, reservoir, cap, and trap rocks are present in the right proportions.
Between 10 (Cenozoic) and 180 (Mesozoic) million years ago, the majority of natural gas and oil creation took place. Only 10% of oil reserves are Paleozoic (more than 200 million years ago).
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