GeoDigital Information's Morrow Series study is designed to enhance both exploration and development efforts that are directed at Morrow reservoirs. These reservoirs occur within transgressive valley-fill sequences at multiple stratigraphic horizons. GDI has created an extensive sequence-stratigraphic framework that documents ten intervals of valley-fill deposits. The mapping of these intervals is essential in the exploration for Morrow-age reservoirs.

The Morrow study represents six man-years of geologic research which affords explorationists significant time savings in assimilating data and developing exploration strategies. The study area covers 16,500 square miles in southeastern Colorado, western Kansas, and the northern Oklahoma Panhandle. It spans Cheyenne, Prowers, Baca, and portions of Kit Carson, Lincoln, Kiowa, and Bent counties in Colorado; all of Wallace Greeley, Hamilton, Stanton, Morton, and portions of Sherman counties in Kansas; and portions of Cimarron and Texas counties in Oklahoma.

Correlations of 5,039 wells were made by defining six regional markers from the top of the Mississippian to the top of the Pennsylvanian Marmaton. Morrow valley-fill sequences are

defined with, up to, 14 additional sub-regional correlation markers in 3,039 wells. Landsat imagery is included in the study to delineate paleostructures that affected Morrow drainage patterns and facies distributions.

Morrow depositional models and lithofacies reservoir potential are determined through the integration of core, thinsection, log analyses, and engineering data. Five representative field studies are incorporated with a focus on Morrow reservoir characteristics, trap types, and deliverability.

The Morrow study contains descriptions of 72 cores including 25 Union Pacific Resources proprietary cores and 11 Amoco Production proprietary cores that are essential for understanding the geologic history in this region.

The study components include an extensive summary text and figures, maps and cross sections, two volumes containing core and thinsection descriptions integrated with core-to-log comparisons, and four volumes of stratigraphic data appendices. These components provide the client with a presentation format that is concise and readily useable.