In Jurassic Nugget Formation sandstones in East Painter Reservoir in the Wyoming overthrust belt, open fractures have been identified as a key reservoir element. In this study, we document fracture spatial distribution from 13 horizontal image logs in the doubly plunging East Painter Reservoir anticline. New analysis methods allow identification of spatial arrangement patterns and tests of correlation of spatial arrangement with fracture abundance and fold curvature. We found that the steeply dipping forelimb of the anticline tends to host the highest overall fracture density, whereas the gently dipping backlimb has lower fracture density, but these values depend on which fractures are included in the analysis. Degree of fracture clustering varies. Despite high fracture intensity, fracture arrangement in the forelimb is mostly indistinguishable from random. On the gently dipping backlimb fractures are markedly more clustered than random arrangements. Hierarchical and regularly spaced clustered were detected.
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