Pre-test geological and geochemical evaluation of the Caprock, St. Peter Sandstone and formation fluids, Yakley Field, Pike County, Illinois Page: 116 of 275
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green sand, white sand and dark or light gray sand samples.
For convenience, the discussion of measurements is divided by
color.
Green Sand -
Porosities vary from 10.0 to 23.0%. Vertical perme-
abilities range from 0.93 to 3890 md, and horizontal
permeabilities range from 2.08 to 6098 md. Porosity/perme-
ability cross-plots are presented in Figure II-4. Results
are presented in Table II-3. In a very general way, as
the porosity increases, the permeability increases.
White Sand -
Porosities of white sand samples vary from 9.7 to
20.9%. Horizontal permeabilities range from 13 to 5248
md, and vertical permeabilities range from 78 to 2866 md.
Permeability of the white St. Peter sandstone appears to
be controlled by cementation patterns rather than by
spatial orientation. A porosity/permeability cross-plot,
is presented in Figure II-5. A crude correlation between
porosity and permeability exists. Results are presented
in Table II-4.
Medium to Dark Gray Sand -
Four vertical and one horizontal air permeability
measurements indicate that vertical permeability is greater
than horizontal permeability. Vertical permeability
ranged from 78 to 417 md. Porosities varied from 14.2 to
17.7%. Results are presented in Table II-5. A porosity/per-
meability cross-plot demonstrates that porosity and per-
meability are independent variables (Figure II-6).
Conclusions -
1. Caprock permeability increases with depth. As the
Joachim-St. Peter transition zone is neared, the
permeability of the Joachim dolomite increases, in
general.
2. Green sand samples are generally more permeable than
either white or medium to dark gray St. Peter Sand
samples.II-2
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Pre-test geological and geochemical evaluation of the Caprock, St. Peter Sandstone and formation fluids, Yakley Field, Pike County, Illinois, report, March 1, 1983; United States. (https://digital.library.unt.edu/ark:/67531/metadc1212590/m1/116/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.