Mississippian Ratcliffe and Nesson Reservoirs, Rosebud Field, Williams County, North Dakota

Abstract

Rosebud is a Ratcliffe and Nesson held, located ln the central part of the Willrston basin. The field has five producing wells, but 1s not completely defined Rosebud field may have 5 to 15 additional locations and the potentla1 for recoverable reserves ln excess of one million barrels of oil Production IS controlled by a combination of structure and stratigraphic pinchout of porosity Ratclifte production IS from an algal buildup and is the primary reservoir in the field Nesson production is from a carbonate shoal facies. Rosebud fields located on an east plunging structural nose with 13 ft (4 m) of closure at the Nesson level. Both Ratcliffe and Nesson porosity are best developed along the crest of the structure A fairway of Ratcliffe algal buildups and Nesson shoals offer additional exploration opportunities in a relatively undefined area of the Williston basin