Abstract
Pennsylvanian Morrow sandstones are oil and gas productive throughout a large area in southeast Colorado. The Sorrento-Mount Pearl-Sianna fields represent an area of 8200 acres (3319 ha) of continuous production at depths of 5316-5575 ft (1620-1699 m) from a middle Morrow sandstone reservoir. Recoverable reserves for the three fields are estimated to be over 20 million bbl of oil. The average ultimate recovery per well is 250,000 to 300,000 bbl of oil. On the basis of subsurface mapping, productive sandstones are interpreted to be fluvial valley-fill deposits, consisting mainly of channel sandstones. The deposits are encased in marine shale and range in thickness from 0 to 72 ft (0 to 21.9 m). The Sorrento-Mount Pearl-Sianna field complex is a large stratigraphic trap formed by a change of channel trend against regional structure. Paleostructure may have controlled the location of the valley-fill system. Present-day structure plays a minor role by creating multiple gas-oil and oil-water contacts in the fields.
Published Version
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