Data related uncertainties in the definition of wellhead capture zones

The Local Gradient Estimate Technique (LGET) is extended to delineation of capture zones: (a) the LGET is extended to provide a reliable test for measurement errors, and (b) the LGET is also extended to delineation of uncertainty in the geometry and orientation of a capture zone. It is demonstrated that the LGET, in combination with monitoring wells, allows elimination of major measurement errors and estimation of capture zones, including uncertainty, with better performance than that obtained using two other common approaches to capture zone delineation.