Geological and petrophysical characterization of the Ferron Sandstone for 3-D simulation of a fluvial-deltaic reservoir. Deliverable 1.4.4: Ferron Sandstone lithofacies and case-study areas, Emery and Sevier Counties, Utah

The types of dominantly sandstone lithofacies that characterize the Cretaceous Ferron Sandstone reservoir types were tentatively identified before the project began. These reservoir types were defined and mapped at the regional scale and are the subject of the detailed, highly focused case studies. The purpose of conducting detailed case-study analysis is to develop a comprehensive, interdisciplinary, and quantitative characterization of fluvial-deltaic reservoirs which will allow realistic inter-well and reservoir-scale modeling to be used for improved oil-field development in actual reservoirs world-wide. The resulting benefits and value may: (1) increase recoverable reserves by identifying untapped compartments created by reservoir heterogeneity, (2) reduce development costs by more efficiently siting infill drilling locations, (3) increase deliverability by exploiting the reservoir along optimal fluid-flow paths, (4) enhance the application of new technologies, such as horizontal drilling, by identifying optimal drilling directions to maximize fluid-flow, and (5) identify reservoir trends for field extension drilling. Various geologic studies of the Ferron Sandstone were reviewed to compile a list of locations and types of lithofacies in the Ferron Sandstone to be examined in greater detail as part of the subsequent case studies. Preliminary regional interpretations were also used to help select the type and location of lithofacies for case studies. Potential case-study sites were delineated during several reconnaissance field trips by the geologic team. Two case-study sites were selected for the project: Ivie Creek and Willow Springs Wash, in the central and southern parts respectively of the project study area. Results are discussed