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  4. Characterization, Petrography, and Static Geologic Modeling of an Unconventional Carbonate Reservoir, Intervals of the Midale and Rival "Nesson" Beds in the Mississippian Madison Group, Burke County, North Dakota
April 01, 2012 Abstract

Characterization, Petrography, and Static Geologic Modeling of an Unconventional Carbonate Reservoir, Intervals of the Midale and Rival "Nesson" Beds in the Mississippian Madison Group, Burke County, North Dakota

The Plains CO2 Reduction Partnership based at the Energy & Environmental Research Center has selected the Rival Field area as one of its Phase III Regional Characterization sites examining promising oil fields with potential for carbon dioxide (CO2) enhanced oil recovery. The Midale beds are at the base of the Charles Formation and conformably overlie the Rival beds from the Mission Canyon Formation. Together, the Midale/Rival intervals represent a 40-80-foot-thick, traditional warm-water near-shore neritic carbonate system that has been locally productive in the Rival, Black Slough, Portal, and Lignite oil fields located in Burke County, North Dakota.The Midale beds of the Ratcliffe interval conformably overlie the Frobisher-Alida interval that was deposited during rapid carbonate progradation representing a shallowing-upward carbonate-to-evaporite sequence during Mission Canyon time. Progradation ceased, and a subtle transgressive sequence began to flood the shoreline, depositing the Upper Rival and Midale beds. The Upper Rival comprises a prominent skeletal shale zone 3-9 feet thick, restricting hydrocarbon movement between the Midale and Rival beds. The Midale is represented by two localized macrofacies defined by current petrographic and core plug analysis completed in two wells: 1) micritic, fossiliferous, sometimes argillaceous mudstones that have experienced variable (sparry) dolomite recrystallization, and 2) porous ooid/pellet grainstone banks partially cemented with sparry dolomite cement. The Midale is overlain by the argillaceous Three Fingers Formation and the 30-foot-thick Midale Salt, representing the updip seal for the reservoirs.Two prominent structural noses representing shallow dipping anticlines are present in the northeast corner of the Rival Field. Production from the Midale reservoir is significantly better on structure than off. Pressure regimes can also be attributed to the structure along with the implication of w

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Event/Meeting Information

American Association of Petroleum Geologists Annual Convention & Exhibition Long Beach
4/22/2012
Long Beach, CA