The Role of Moldic Porosity in Paleozoic Kansas Reservoirs and the Association of Original Depositional Facies and Early Diagenesis With Reservoir Properties

Kansas Geological Survey
Open-file Report 2003-32

Facies (7) Wackestone (Non-reservoir)

Peloidal wackestone / packstone with clotted fabric, #2 Matoush 3345’,plane polarized light.

Typically massive to horizontally laminated with burrow mottling also common. Matrix is composed of euhedral dolomite (< 0.05 mm) with little or no porosity. Replacement of evaporite nodules with chert is observed in some intervals. This facies is interpreted as being deposited in shallow-water, low energy restricted environments or in deeper water away from the Central Kansas Uplift. Vuggy porosity up to 8% is locally present near the unconformity but is often isolated or separated by low permeability matrix.

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Last updated June 2003