A Nonconventional CO₂-EOR Target in the Illinois Basin: Oil Reservoirs of the Thick Cypress Sandstone

Abstract

This section describes project activities undertaken to complete geologic characterization of Noble, Kenner West, and Loudon Fields. A range of project activities were completed at each study site including stratigraphic correlation, sedimentary facies analyses, and identifying petrophysical characteristics of the reservoirs present in a specific field. Isopach maps were developed which show variation in the thickness and geometry of the thick Cypress Sandstone. This work facilitated the broader, regional geologic characterization of the Cypress Sandstone (see Section 3.4).While a range of project activities were conducted in order to complete field-scale geologic characterization, not all project activities pursuant to this goal were undertaken at each individual field. At Noble, project activities included both stratigraphic and facies analyses as well as reservoir characteristics (i.e., reservoir geometry, volumetric analysis, and isopach maps). At Kenner West, project activities included stratigraphic analysis and reservoir characteristics (i.e., reservoir geometry, volumetric analysis, and isopach maps). At Loudon, project activities were limited to stratigraphic analysis and reservoir characteristics (i.e., reservoir geometry and isopach maps). Noble Field1.4 to 1.6 million m 3 (8.5 to 9.9 million bbl) Cumulative production= 0.2 million m 3 (1.3 million bbl)Recovery efficiency= 13.2 to 15.4% Loudon Field