--> Abstract: Reservoir Characteristics of Shoreline Barrier Systems: Examples from Patrick Draw Field, WY, and Bell Creek Field, MT, by S. R. Jackson, M. Szpakiewicz, and R. Schatzinger; #91012 (1992).

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ABSTRACT: Reservoir Characteristics of Shoreline Barrier Systems: Examples from Patrick Draw Field, WY, and Bell Creek Field, MT

JACKSON, SUSAN R., MICHAEL SZPAKIEWICZ, and RICHARD SCHATZINGER, National Institute for Petroleum and Energy Research/IITRI, Bartlesville, OK

This paper presents a synthesis of the depositionally derived reservoir characteristics of barrier island systems. The summary is based on information from two Cretaceous-aged outcrop-reservoir pairs representing two endmember types of barrier island systems: the Almond Formation, a mesotidal system productive in Patrick Draw field, Wyoming, and the Muddy Formation, a microtidal system productive in Bell Creek field, Montana. The study was undertaken to identify and quantify those characteristics most suitable for developing realistic, broadly applicable reservoir models of barrier island deposits.

Both reservoirs are typical of shoreline barrier reservoirs in that they are stratigraphic traps with reservoir thickness from 20 to 30 ft. Field-scale compartmentalization caused by erosional processes is common to both reservoirs, and primary production is strongly influenced by the architecture of the depositional systems. Post primary production, however, appears to have been strongly influenced by faults and diagenetically controlled variations in permeability. This indicates that a depositionally based reservoir model will likely require expansion to incorporate structural and diagenetic information during field development.

For model development, reservoir lithofacies (rock types) are identified based on combinations of sedimentary structures, grain size distribution, mineralogy, pore geometries, petrophysical characteristics, and adjacent genetic units (facies). These lithofacies comprise the building blocks for reservoir model development. Once defined, lithofacies geometries, relative volumes, lateral continuity, permeability correlation lengths, and vertical sequence are determined to identify the reservoir architecture and spatial distribution of fluid flow parameters.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)