South Eubank Field, Haskell County, Kansas: A case of field redevelopment using subsurface mapping and 3-D seismic data

A portion of recent field development efforts in the Hugoton embayment of w estern Kansas has focused on deeper, less drilled, Mississippian sandstone reservoirs of the Chesterian Series. Such efforts have yielded particular s uccesses in the case of South Eubank field, Haskell County, Kansas. New cor e data, combined with subsurface mapping and three-dimensional (3-D) seismi c information, have led to over 30 new producers being drilled in this fiel d. Reservoirs are best developed in fine-grained, well-sorted, Chesterian s andstones filling a narrow incised paleovalley system that runs north-south through the field. Although new core information contributed to improved r eservoir characterization in the area, 3-D seismic data were required to ac curately delineate the paleovalley system and thus locate specific prospect s. A number of such prospects remain to be drilled. Success at South Eubank suggests that other portions of the same valley system also might be simil arly developed. This system extends at least 50 mi (80 km) from northern Ha skell County to the Oklahoma border, through a number of existing field are as.