Sleepy Hollow Field of Red Willow County, Nebraska: ABSTRACT

Abstract

The Sleepy Hollow field, on the southwest flank of the Cambridge arch, is a recently discovered oil field of major importance which produces from multiple pay zones at a relatively shallow depth. The oil accumulation is partly controlled by a structural nose, trending south-southwest across the field. A large area of limited reversal may be mapped near the center of the field. Good porosities across the southern half of the field are responsible for production from the Lansing-Kansas City limestones. The principal producing limestone of this group is the C zone. The build-up of porosity in the C zone is a part of a porosity trend which can be traced for a considerable distance east and west of the field. Production from the basal sand is controlled by an oil-water contact on the flanks of the structure and by a pinch-out or truncation of the sand at the northeast end of the field. Cumulative production from the Sleepy Hollow field exceeds 10 million barrels. The Lansing-Kansas City has contributed approximately 3 million barrels and the basal sand has produced approximately 7 million barrels. The wells in the field average 3,500 feet in depth and can be completed for less than $40,000. End_of_Article - Last_Page 116------------