Oil shaleWikipedia

Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen from which liquid .. Modified in-situ processes involve removing part of the oil shale and bringing it to the surface for modified in-situ retortingHowever, oil shale use for production of these items remains small or only in its experimental stages.

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Shale: Sedimentary RockPictures, Definition…

This composition places shale in a category of sedimentary rocks known as "mudstones.This oil and gas is very difficult to remove because it is trapped within tinyHowever, heavy use depleted most of the small clay deposits.Any oxygen that entered the environment quickly reacted with the decaying organic debris.

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