Quantitative interpretation using conventional and facies-based pre-stack inversion — A thin dolomite reservoir case study in Cabin Creek Field, Williston Basin

Abstract

Cabin Creek Field, on the southwestern flank of the Williston Basin, is one of 14 hydrocarbon fields within Cedar Creek nticline. The field was initially discovered in May 1953 and developed by Shell starting with primary production followed by water flooding beginning in the late 1950s. In 1999, Encore purchased Shell’s interests and focused on infill drilling. In 2010, Denbury Resources acquired Encore giving it the potential to undertake enhanced oil recovery operations in the Rockies. Production is from the Ordovician Red River, Silurian Stony Mountain, Interlake, and Mississippian Mission Canyon Formations. The objective of the Cabin Creek reservoir characterization is to document reservoir heterogeneity within the target reservoirs and to facilitate development of the CO2 flood. The goal of this integrated case study is to generate a representative reservoir model that combines the structural framework and porosity prediction within the Red River Formation. This paper focuses on utilizing and comparing conventional and facies-based pre-stack inversion methods to characterize the porosity at the reservoir level.