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Oil in Chalk
Author(s) -
HANCOCK JAKE
Publication year - 1985
Publication title -
geology today
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.188
H-Index - 17
eISSN - 1365-2451
pISSN - 0266-6979
DOI - 10.1111/j.1365-2451.1985.tb00317.x
Subject(s) - geology , porosity , geochemistry , permeability (electromagnetism) , petroleum reservoir , paleontology , mineralogy , geotechnical engineering , genetics , membrane , biology
Chalk is not the sort of rock that you would expect to yield oil. Although it has a high porosity when first formed, the permeability is low. Even the porosity is normally much reduced under overburdens of more than 1000 m. Yet in the North Sea there are special conditions that allow major reservoirs in the Chalk beneath thousands of metres of Tertiary sediments.