Petrography, Lithology, Stratigraphy, Bioturbation, and Trace Fossil-permeability Relationship of the Montney Formation of Lower Triassic, in Barrick Puskwa, Alberta, Western Canadian Sedimentary Basin
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Abstract
In North Eastern British Columbia (NESB), the Montney Formation has been recognized as a world class tight gas reservoir. As previous work has shown, the Lower Triassic Montney Formation is a complicated succession of siltstone, sandstone, and bioclastic packstone/grainstone. The Montney Formation from three drill-cores have been examined and classified based on sedimentological and ichnological characteristics. By employing spot-minipermeametry methods, the influence of sedimentary fabric on reservoir properties is assessed. The sedimentary environments are interpreted as offshore to shoreface sedimentary conditions and perhaps rive influence shoreface environments. Results from core analysis and permeability and porosity testing demonstrate that grain size is the main impact factor and intergranular pore is the main type of pore for these facies; otherwise, the distribution of pore is disturbed by burrows.