Contribution of non-coal facies to the total gas-in-place in Mannville coal measures, Central Alberta

Most producing coalbed methane formations are similar to the Mannville coal measures in that they include non-coal organic rich lithologies that can be anticipated to have generated and retained hydrocarbons similar to coal. How much the non-coal lithologies will contribute to the producible 'coalbed' will vary with geology of the coal measures and the drilling and completion methods utilised. Not considering the contribution of non-coal facies to the gas resource and producible gas, will under value the resource and result in non-optimal field development.