When the shales that now contain gas were formed, there was no gas in them. Describe how the organic matter was transferred into

Question

4 years ago

8

gas trapped in shale.

1 answer:

valentina_108 [34] · Answer 1 · 2021-11-22T19:45:16+03:00

Explanation:

The shale acts a reservoir rock for the gas. This is why the gas collects and is found in it.

Originally, when sediments collects in a basin, the contain remains of life.
Inside the basin, with prolonged exposure, they decay and becomes lost.
When rapid burial and sedimentation occurs, they are cut of from the oxic environment that causes them to decay.
This leads to the formation of organic matter buried in rocks.
As compaction increases with burial, the organic matter is transformed under high temperature and pressure into kerogen.
When temperature nears that of the oil window, crude oil will form with a layer of biogenic gas on top of it.
The gas and oil will not stay but will follow a trap where they eventually end up being stored in a reservoir rock.
Such reservoir rock is shale. This is why the gas is found there

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