Geologic factors affecting reservoir analysis, Anschutz Ranch East Field, Utah and Wyoming

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/10992-PA· OSTI ID:5418756

Lelek, J J

The Anschutz Ranch East field consists of two separate structures created by compressional stresses related to large-scale rock movement in a geologic province dominated by regional eastward thrusting. Production is currently from the 1,050-ft- (320-m-) thick heterogeneous eolian sand package of the Jurassic Nugget sandstone. Since the pressure of the in-situ retrograde condensate is near the dewpoint, pressure maintenance in the form of a nitrogen-injection program must be instituted before production can begin. A plan of depletion, therefore, must be formulated before any production history is established. Production models must rely heavily on geologic input early in the development of the field. Delineation of the productive limits of the Anschutz Ranch East field has been the initial area of input. As log, core, and rock data are accumulated and processed, geologic input affecting reservoir analysis will include information concerning rock character, rock-type distribution, secondary features affecting the reservoir rock, and permeability anisotropy resulting from stratigraphy and structure. Reservoir analysis and the formulation of a depletion plan must be synergistic with this evolving body of geologic interpretation.

• Research Organization: Amoco Production Co.
• OSTI ID: 5418756
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 35:9; ISSN JPTJA
• Country of Publication: United States
• Language: English

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