Pre-test geological and geochemical evaluation of the Caprock, St. Peter Sandstone and formation fluids, Yakley Field, Pike County, Illinois Page: 160 of 275
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FIGURE Iv-2
WELL: YAKLEY C
FORMATION: ST. PETER (GREEN)
DEPTH: 645.0 FEET
SAMPLE NO. D391-035,-035a,-035b
RED DOT = 0.12 mm
Plane Polarized Light
PHOTOGRAPH DESCRIPTION
A Medium grained poorly sorted, unheated sandstone.
Quartz grains (colorless) are surrounded by det-
rital clay matrix (brown) and authigenic iron
sulfide (black). Quartz grain size distribution
is bimodal. The sample exhibits poor to moderate
porosity.
B This photo illustrates the effect of heating for
24 hours at 390 F. Porosity (blue) appears to
have increased. Depositional matrix has spalled
from quartz grain surfaces. Iron sulfide (black)
appears to be less abundant, but this may be due
to a natural uneven distribution of the phase.
C After heating for 48 hours at 390*F, porosity has
increased significantly. Depositional matrix is
still in contact with quartz grains only in shel-
tered pores.IV-20
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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/m1/160/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.