Petrophysical Study of the West Edmond Field, in parts of Oklahoma, Canadian, Kingfisher, and Logan Counties, Oklahoma

Abstract

The purpose of this study was to examine the Hunton Group reservoirs of the West Edmond Field in parts of Oklahoma, Canadian, Kingfisher and Logan Counties, Oklahoma. The objectives included: reconstructing the stratigraphy of the West Edmond Field using modern wire-line logs and recent advances in interpretations, establishing a depositional model and sequences for the upper part of the Hunton Group, examining previous reservoir engineering studies of the West Edmond Field to establish pathways of fluid migration and reservoir characteristics, and establishing dominant porosity types within the upper Hunton Group using whole core analysis, thin-sections, or scanning electron microscopy. The Hunton Group carbonates include carbonate mounds (Frisco Formation), supratidal, intertidal, and subtidal carbonates deposited in a shallow ramp setting. Three petrophysical facies (A, B, and C) were identified that contain distinct lithologic characterisitics. Petrophysical facies A is composed of skeletal grainstones and packstones, facies B is composed of dolomitized skeletal wackestones, and facies C is composed of skeletal oolitic grainstones. Dominant porosity types include intraparticle pores in petrophysical facies A, intercrystalline pores in facies B, and oomoldic pores in facies C. Fracture porosity dominated fluid movement in early secondary recovery efforts. As a result recovery of oil and gas was highly inefficient. High fracture permeability and some interparticle pores in petrophysical facies A were depleted of oil and gas whereas lower-permeability zones if facies B and facies C contain economic reserves.