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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Fault
Geometries, Faulting Mechanisms, and Sealing Properties
1Manuscript received June 1, 1998; revised manuscript received July 1, 1999;
final acceptance September 15, 1999.
2Statoil a.s., N-4035 Stavanger, Norway
ABSTRACT
fault
zones mostly have a dip of 40-60°, a width of up to 2.3 m, and contain
fault
-parallel 3-5-m-long overlapping sandstone sheets with widths of 5-40 cm, and up to
2-m-thick
fault
-parallel sandy mudstones. The intrafault sandstones show
fault
-parallel
banding resulting from differences in detrital clay content and grain size. The banding
has been enhanced by selective, late diagenetic quartz cementation of the clay-poor bands.
Thin clay laminae, now developed into
fault
-parallel stylolites, occur along the margins
of the intrafault sandstones. The clay laminae do not emerge from clay layers in the
fault
blocks and are not clay smears. The laminae probably formed during faulting when
fluidization within the
fault
zones allowed clay particles to move laterally and
accumulate along the margins of the
fault
zones. There is no enhanced cementation or
cataclastic deformation within the
fault
zones. The ability of the
fault
zones to act as
capillary seals or barriers to fluid flow is therefore mostly determined by the clay
laminae rimming the intrafault sandstones.
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