Description
The Sacroc field is one of the largest Pennsylvanian Reef fields in the famous Horseshoe Atoll trend in the Permian Basin. This study covers the northern portion where CO2 was injected in 1972 and failed due to a lack of understanding of reservoir architecture. A recent 3D seismic survey has revealed the basic architecture and provided a basis for constructing a robust reservoir model. Quantifying the geologic model with permeability was a difficult challenge because the vast majority of the wells had only gamma-ray/neutron log combinations. Therefore, a method of combining stratigraphy and rock-fabric transforms was used. The resulting permeability model illustrates the difficulty of interpreting the results of injection tests and the need for a robust permeability model to plan future CO2 recovery operations.