In most reservoir engineering studies, the vertical fracture height and the formation height are assumed to be equal, which may or may not be true. This study investigates the effect of vertical fracture penetration and horizontal anisotropy in the development of production decline curves for a low permeability gas reservoir.

This study shows that the productivity for a given vertical fracture decreases as the fracture position departs from the center of the formation interval. Horizontal anisotropy significantly impacts production decline curves. Up to approximately 70 percent of cumulative recovery is affected significantly regardless of the fracture penetration ratio.

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