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Abstract

Two parasequence intervals in the Cretaceous Ferron Sandstone Member of the Mancos Shale exhibit contrasting facies and permeability relationships that can be used as models for reservoir characterization. Stratigraphic sections, permeability transects, photomosaic panels, and drill-hole core data are combined to establish relationships between sedimentary features and permeability, and to create a three-dimensional (3-D) framework. The fluvial-dominated bedset of one parasequence locally exhibits seaward-dipping clinoform geometries. In contrast, the wave-modified parasequence set contains tabular facies that range from foreshore to prodelta environments. A comparison of these two depositional types shows the fluvial-dominated deposits contains: (1) higher percent shale, (2) lower degree of bioturbation, (3) finer average grain size in reservoir facies, (4) overall lower permeability values, and (5) low-permeability bounding layers between bedforms.

Various sedimentary features are used to summarize and characterize potential reservoir units. Facies, sedimentary structure, and average grain size each are related to permeability in approximately log-normal distributions. Permeability values range from 0.5 to 1121 md. The geometric mean permeability for the clinoform facies ranges from 8.3 md in proximal sandstones to 1.5 md in distal sandstones. The geometric mean permeability for the wave-modified facies range from 146 md in the foreshore to 0.95 md in the transgressive deposits.

A 3-D clinoform facies model of the fluvial-dominated bedset is constructed to preserve the pro-grading clinoform geometries and facies relationships. The 3-D facies model combined with permeability distribution provides input to detailed 2-D and 3-D fluid flow simulations. This study links comprehensive field studies to reservoir characterization and can serve as an analog for other fluvial-deltaic reservoirs with fluvial and or wave influence.

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