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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Hydrologic Differences
Arising from Source Material Differences Between Southwestern Louisiana
Aquifers and their Age Equivalents in Southeastern Louisiana
Carlson, Douglas1 and Milner, Riley1
ABSTRACT
There are three major aquifers in southwest
Louisiana: Chicot, Evangeline and Jasper Aquifers. To the east of the Mississippi
river there are three major aquifers in southeastern Louisiana which are
age equivalent, Chicot Equivalent, Evangeline Equivalent and Jasper Equivalent.
However, these two sets of aquifers have different sources of materials and
the styles of deposition, continuous/episodic, differ as well. This difference
of sources will yield two sets of aquifers that have different geologic and
hydrogeologic properties.
The deposition of sands and silts for southwestern aquifers
was in general continuous while the deposition for southeastern aquifers
was more episodic. These differences of sources will yield differences in
the grain size distribution between southwestern and southeastern aquifers.
For these six aquifers a number of properties of grain size distribution
will be determined for about 5000 sieved samples, each aquifer has over 400
tests. In general, median, standard deviation, skewness and kurtosis will
be considered. These differences of grain size distribution properties will
in turn influence the hydraulic characteristics of southeastern aquifers
to be different from southwestern aquifers. The hydraulic properties that
will be considered are porosity and hydraulic conductivity. About 1200 values
of porosity were determined from analysis of geophysical logs and water quality
data. Hydraulic conductivities were determined from about 1200 specific capacity
tests analyzed for each of the six aquifers; each aquifer has over 100 tests.
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