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- W113719418 abstract "Abstract A study of medium to small scale faults has been carried out on outcrops of Cretaceous sandstones from eastern Spitsbergen (Kvalvagen) and on Jurassic reservoir sandstones from Haltenbanken, offshore mid-Norway. Structural and textural evidences from the faults indicate that they formed at shallow depth when the sand was uncemented. At Kvalvagen the faulting can be demonstrated to be syn-sedimentary, and formed during the progradation of a deltaic sequence. Rapid fluid escape along developing faults gave rise to deformation zones with fault parallel laminae. The high frequency of fault structures observed in cores from the reservoir sandstones of the Njord Field, Haltenbanken, formed at shallow burial depth. This is inferred by the fact that feldspar dissolution and precipitation of authigenic kaolinite, which probably relates to meteoric water flushing, post-date movements on the faults. Enhanced pressure solution and stylolitization have developed on the fault structures at both localities at greater burial depths, due to enrichment of clay minerals and micas along the fault planes when they formed. Steeply dipping stylolites, such as those observed in some Haltenbanken reservoir sandstones, can therefore be explained by selective pressure solution along fault planes due to overburden stress, and need not imply horizontal tectonic stress. Permeability measurements of the fault planes show that they are important barriers to horizontal fluid flow and may significantly influence the reservoir properties." @default.
- W113719418 created "2016-06-24" @default.
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- W113719418 date "1992-01-01" @default.
- W113719418 modified "2023-10-15" @default.
- W113719418 title "Small faults in sandstones from Spitsbergen and Haltenbanken. A study of diagenetic and deformational structures and their relation to fluid flow" @default.
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- W113719418 doi "https://doi.org/10.1016/b978-0-444-88607-1.50040-1" @default.
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