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  <!ELEMENT abstract ANY>
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<abstract>
<title>Anisotropy of sandstone permeability</title>
<author>Rudi Meyer</author>
<p>Small-scale probe permeability measurements on differently oriented
faces of highly compacted and quartz-cemented Viking Formation
sandstones yield detailed permeability distributions that appear to be
diagnostic of the grain- and lamina-scale fabric of the
samples. Permeability anisotropy of a single
'structureless'-appearing sample is low, reflected by a kV /
kH-ratio of 0.7; corresponding k-distributions are homogeneous.
Permeability anisotropy of a strongly laminated sample is variable,
with kV / kH-ratios of 0.1 and 2.8, thought to be a function of the
variability of the pore network connectivity for any given
lamina. Significantly, the pore network anisotropy established during
deposition has been maintained after several kilometres of burial, and
cementation and dissolution processes. Lamina-perpendicular
permeability distributions are very homogeneous relative to those of
kH, which is taken to imply that fluid-fluid displacement processes
are potentially more efficient in that orientation.  In comparison to
the dataset presented herein, industry-standard core analyses of kMAX,
k90, and kV, do not appear to yield relevant kV / kH-ratios that may
be linked to the evolution of permeability anisotropy with depth. In
future work, quantitative measures of pore network anisotropy will be
compared to multi-directional probe permeability data to test causal
relationships between permeability and pore network evolution.
</p>
</abstract>
