World Class Source Rock
Certain source rocks are referred to as 'world class', meaning that they are not only of very high quality but are also thick and of wide geographical distribution. Examples include:
- Middle Devonian to lower Mississippian widespread marine anoxic oil and gas source beds in the Mid-Continent and Appalachia : (e.g. the Bakken Formation of the Williston Basin, the Antrim Shale of the Michigan Basin, the Marcellus Shale of the Appalachian Basin ).
- Kimmeridge Clay – This upper Jurassic marine mudstone or its stratigraphic equivalents generated most of the oil found in the North Sea and the Norwegian Sea.
- La Luna Shale – This Turonian formation generated most of the oil in Venezuela.
- Late Carboniferous coals – Coals of this age generated most of the gas in the southern North Sea, the Netherlands Basin and the northwest German Basin.
- Hanifa Formation – This upper Jurassic laminated carbonate-rich unit has sourced the oil in the giant Ghawar field in Saudi Arabia.
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