Print this pageEnhanced Gas Storage Reservoir Characterization through Core-Derived Flow Units, Facies and Log Integration of Cambrian Mount Simon Sandstone, Illinois
UDEGBUNAM, EMMANUEL O., DAVID G. MORSE and BEVERLY SEYLER
Rock core-log data transforms derived from integration of hydraulic flow units and sedimentary facies improve reservoir characterization of a gas storage field. Porosity and permeability data from 264 feet of whole core and the corresponding gamma ray log were compared with facies descriptions, thin section petrology, scanning electron microscopy and petrophysically derived hydraulic flow units of the Cambrian Mount Simon Sandstone at Crescent City Gas Storage Field, Illinois to develop flow parameters for uncored wells.
Hydraulic flow units, quantified by the flow zone indicator (FZI), are controlled, to a large extent, by grain size, sorting and degree of cementation. Comparisons of gamma ray log, FZI and grain size showed that flow units can be predicted in neighboring uncored wells. Permeability values of intervals in neighboring wells were calculated from permeability-porosity cross plots of each distinct flow unit class and its log porosities better duplicate reservoir parameters which in the past have been derived from conventional permeability-porosity cross plots because distinct flow unit populations are present.
Reservoir simulation models prepared using the results of this work are more realistic because they integrate geological features that may have a first order effect on reservoir performance, and because more accurate permeability values can be obtained for uncored wells.