Question

What is the most accepted theory as to where oil and gas comes from?

Answer 1

organic theory is the most accepted theory which describe from where oil and gas comes from .

The organic theory states that the carbon and hydrogen essential for the formation of oil and gas were derivative from early marine life forms living on the Earth during the geologic past -- primarily marine plankton. Although plankton are microscopic, the ocean contains so many of them that over 95% of living matter in the ocean is plankton. The Sun's energy provides energy for all living things including plankton and other forms of marine life.

As these early life forms died, their remains were taken by the processes of erosion and sedimentation Sequential layers of organic-rich mud and silt covered preceding layers of organic rich sediments and over time created layers on the sea floor rich rich in the fossil remains of previous life .

Thermal ripening processes (decay, heat, pressure) slowly converted the organic matter into oil and gas. Add additional geologic time (millions of years) and the organic rich sediments were converted into layers of rocks. Add more geologic time and the layers were deformed, buckled, broken, and uplifted; the liquid petroleum flowed upward through porous rock until it became trapped and could flow no further forming the oil and gas that we explore for at present

But the chemistry of the hydrocarbons found in the end product (oil, gas) differ somewhat from those we find in living things. Thus changes, transformation, takes place between the deposition of the organic remains and the creation of the end product.