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Drilling horizontally within shale zones, in the presence of structural complexities, remains a major challenge. A multi-well walkaway-VSP survey was used to determine the correct structural interpretation between two pilot boreholes having ~500 ft of depth mis-tie. Interpretation of the inter-well VSP image revealed an antithetic fault. Boreholes trajectories were revised to successfully drill horizontal wells within the shale zone from both pilots.

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