moderately argillaceous reservoir

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Chalk Group — The Needles, part of the extensive Southern England Chalk Formation. The Chalk Group (often just called the Chalk) is a lithostratigraphic unit (a certain number of rock strata) in the northwestern part of Europe. It is characterised by thick… … Wikipedia
Chalk Formation — The Chalk Formations of Europe are thick deposits of chalk, a soft porous white limestone, deposited in a marine environment during the upper Cretaceous Period. They appear most prominently in England. The formations are divided into three parts … Wikipedia
Harz — Mountains redirects here. For the district of the same name, see Harz (district). Harz Range Country Germany … Wikipedia

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