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...y assuming the bed dip. If the assumed dip is wrong, the well may exit the target zone. Problems also occur if the well crosses an unexpected fault. From Cha

Problems can be encountered with landing a horizontal well if the target zone is too high or too low compared to what is predicted. From Chapter 28,

...erg field, Norwegian North Sea. The horizontal well section was planned to target several seismically defined, fluvial channel bodies within the Ness Formati

...examples of wells that produce from the Mancos Shale. The main completion target is an interval of the Upper Mancos that is sometimes referred to as Niobrar

...py; by, the Society of Petroleum Engineers. (b) Horizontal well drilled to target oil within a mouth bar in the Ivishak Formation, Prudhoe Bay field. Bay sha