Depositional sequence analysis and sedimentologic modeling for improved prediction of Pennsylvanian reservoirs (Annex 1) Page: 6 of 62
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Near-surface and surface analog studies of oolitic grainstone and phylloid-algal carbonate units in the
Upper Pennsylvanian Kansas City Group in southeastern Kansas include outcrop description, coring
and wireline logging, high-resolution seismic surveys, and core analysis including porosity-
permeability and stable isotopes. The objective of the analog studies is to evaluate the 3-D
heterogeneity at the field and intrafield scales. The results include characterizing the geometries of
stratal units and establishing their relationships to sea-level change and shelf configuration,
orientation, and slope.
Studies of producing fields have included detailed correlation and stratigraphic mapping, derivation of
reservoir properties from wireline logs, cores, core analysis, drill stem tests, and production
information. Mapping the spatial distribution of reservoir properties has also been initiated with the
goal of correlating these properties to information on sedimentology, stratigraphy, diagenesis, and
structure revealed in these investigations.
Computer-assisted inverse modeling is being done to quantitatively resolve geologic processes behind
the observed stratigraphic framework defined in this study. A goal is to establish the limits of
deterministic process-based stratigraphic modeling. Techniques such as time-series analysis are
showing promise in helping to identify and understand the causal mechanisms responsible for the
observed stratigraphy and reservoir framework.iii
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Watney, W. L. Depositional sequence analysis and sedimentologic modeling for improved prediction of Pennsylvanian reservoirs (Annex 1), report, January 1, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1449856/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.