This geological cooking process occurred deep below the surface, at specific temperature ranges known as the "oil window," typically between 60°C and 120°C. Migration and Trapping: Finding the Reservoir After the oil formed, it did not remain in the source rock.
Natural Gas Forms at Higher Temperatures Than Oil
The primary contributors to oil formation were not large dinosaurs, as often depicted, but rather immense quantities of microscopic organisms. If the temperature exceeded this window, the material would break down further into natural gas.
The Transformation: Heat, Pressure, and Time Once the organic matter was buried under sediment, the transformation into oil began. This journey was not straightforward; the oil moved through tiny cracks and pores until it encountered a geological barrier.
Natural Gas Forms at Higher Temperatures Below the Oil Window
The lipids in the cell walls of these ancient plankton are molecularly similar to the components of crude oil. Because oil is less dense than the surrounding rock and water, it is buoyant and began to migrate upward through porous rock layers.
More About Where does oil come from
Looking at Where does oil come from from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Where does oil come from can make the topic easier to follow by connecting earlier points with a few simple takeaways.
