Reservoir assessment of late Devonian Kakisa Formation, northeastern British Columbia, Canada.
The Late Devonian Kakisa Formation of northeastern British Columbia, Canada is a high energy, aggradational, discontinuous carbonate bank complex that is composed of three distinct allocycles designated the “Upper”, “Middle”, and “Lower” Kakisa. The study region includes a 5500 square mile area across which the Kakisa was evaluated in regards to the nature and distribution of facies and their relationship to reservoir quality and its spatial distribution. Data integrated into the study include detailed core descriptions for seven wells, and well logs from 116 wells correlated within a grid of 37 cross sections. Gamma ray logs are particularly useful in characterizing petrofacies that are interpreted to have accumulated within low energy, “off-bank” (relatively higher gamma ray activity and lower reservoir quality) and high energy, “on-bank” (relatively lower gamma ray activity and higher reservoir quality) marine settings. The potentially gas-charged reservoir is only associated with “on-bank” stromatoporoid reef complexes observed within the Upper and Middle Kakisa. Reservoir bodies are isolated within the eastern portion of the study area, and coincide with north-trending, high-energy "on-bank" deposits.