--> --> Short Junction Field Core Description and Petrophysical Analysis of the Hunton Group, Cleveland County, Oklahoma

Southwest Section AAPG Annual Convention

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Short Junction Field Core Description and Petrophysical Analysis of the Hunton Group, Cleveland County, Oklahoma

Abstract

Two units comprise most of the Short Junction field, which produces from the Hunton group, located in northeast Cleveland County, Oklahoma. The units have produced approximately 22 million barrels of oil since 1948 of an estimated 250 million OOIP. The less than 9% recovery even after a secondary water flood leaves a sizable target for a revitalized field.

Trey Resources, Inc. took over operations in 2014 and drilled the WSJU 1101H. The entire Hunton (Bois d'Arc to Chimneyhill) was cored as well as a full petrophysical suite including borehole imaging logs. In 2008, the WSJU 109H, was recompleted as a horizontal lateral and included borehole imaging logs. These data were used to model the Bois d'Arc.

The core was oriented to determine principle stress direction and structural position. Additional whole core samples were analyzed for directional permeability and plugs samples were measured permeability in the east west direction. Three plugs were selected for conventional CT scan analysis to help determine electrical properties.

Advanced interpretation techniques were applied on the acquired borehole images and correlated with the core results. The objective was to characterize the heterogeneities present in the formation. With the creation of full borehole images covering the entire borehole surface, it was possible to better identify various heterogeneities (including vugs and fractures) and classify them as connected or isolated vugs, fractures connecting vugs or heterogeneity developed along bed boundaries. Intervals where the matrix porosity was the predominant component to the overall porosity were highlighted, versus intervals where the vuggy porosity has an important contribution.