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A multidisciplinary approach to research studies of sedimentary rocks and their constituents and the evolution of sedimentary basins, both ancient and modern.
The Cane Creek shale of the Pennsylvanian Paradox Formation has produced more than 7.8 million barrels of oil and about 7.9 billion cubic feet of gas from 18 fields in the Paradox Basin of southeastern Utah. The Cane Creek is divided into three intervals—A, B, and C; the B interval is the primary oil producer. Finely crystalline dolomites and sandstones in the B interval have been the main targets of successful horizontal drilling programs. Hydrocarbon shows were recognized using nondestructive epifluorescence (EF) microscope techniques on samples from wells in the northern part of the basin. A new, qualitative visual EF rating system was developed and applied to these samples. A variety of EF ratings from each well were plotted and mapped. This 44-page Special Study provides (1) a summary of the new EF methods used in the study; (2) detailed petrographic and EF descriptions of Cane Creek samples for 31 wells (in three appendices); (3) 16 maps showing potential oil-prone areas for the entire Cane Creek and the A, B, and C intervals; and (4) a statistical analysis of the EF data. The study will help petroleum companies determine exploration strategies and land acquisition areas. It will also be a reference for government land management agencies, county planners, and local landowners in decision making processes and resource assessments.
Faults commonly trap fluids such as hydrocarbons and water and therefore are of economic significance. During hydrocarbon field development, smaller faults can provide baffles and/or conduits to flow. There are relatively simple, well established workflows to carry out a fault seal analysis for siliciclastic rocks based primarily on clay content. There are, however, outstanding challenges related to other rock types, to calibrating fault seal models (with static and dynamic data) and to handling uncertainty. The variety of studies presented here demonstrate the types of data required and workflows followed in today’s environment in order to understand the uncertainties, risks and upsides associated with fault-related fluid flow. These studies span all parts of the hydrocarbon value chain from exploration to production but are also of relevance for other industries such as radioactive waste and CO2 containment.