--> Abstract: Paleocene Deposition of the Hoback Formation on the La Barge Platform of the Green River Basin, by D. E. Schmude; #91017 (1992).

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ABSTRACT: Paleocene Deposition of the Hoback Formation on the La Barge Platform of the Green River Basin

SCHMUDE, DAVID E., Texaco USA, Denver, CO

A study of the La Barge field in southwest Wyoming provided information on the stratigraphy of individual Tertiary fluvial sequences to maximize EOR (enhanced oil recovery) projects and examine additional development potential. This study clarified the geometry, continuity, trends, sedimentological aspects, and depositional environment of these sandstones. Interpretations of the Paleocene Hoback (Almy) Formation within the La Barge field came from examining well logs and cores. A series of cross sections and maps defined the nature of the Hoback sands on the La Barge platform. Sediment size, shape, composition, and frequency of sedimentary structures from core analysis aided in more accurate description of sediment source and depositional environments. Interpretation of production dat and the depositional nature of the Hoback Formation provided explanations for reservoir segmentation and migration of hydrocarbons.

Analysis of data suggest a northeasterly sourced, sand-dominated braided river deposit for the Hoback Formation at La Barge. The depositional nature of such a deposit results in a variety of discontinuous subfacies, which, in turn, control reservoir continuity of individual channel sandstones. Unsatisfactory EOR programs in the past are now attributed to the depositional characteristics of these sandstones and not to an imbricate fault network.

Production data within the field suggest that vertical migration of most hydrocarbons occurred along the Hilliard fault trace. Fracturing associated with the fault and the concentration of migrating hydrocarbons resulted in greater production on the western flank of the structure. As a result of this study, potential EOR development and Hoback infill locations were identified.

 

AAPG Search and Discovery Article #91017©1992 AAPG Rocky Mountain Section Meeting, Casper, Wyoming, September 13-16, 1992 (2009)