Abstract
Numerical simulations are used to investigate the impact of intrinsic and extrinsic reservoir properties on the production from coal and organic rich lithologies in the Lower Cretaceous Mannville coal measures of the Western Canadian Sedimentary Basin. The coal measures are complex reservoirs in which production is from horizontal wells drilled and completed in the thickest coal seam in the succession (1 m versus 3 m), which has production and pressure support from thinner coals in the adjacent stratigraphy and from organic-rich shales interbedded and over and underlying the coal seams. Numerical models provide insight as to the relative importance of the myriad of parameters that may impact production that are not self-evident or intuitive in complex coal measures.
Highlights
Coal gas production of stratigraphically and structurally complex coal measures is dependent on a myriad of interrelated variables
Bustin 292 productivity, we have investigated the variation in producability of coals and associated organic rich gas shales through a parametric analysis using a numerical modelling program, which simulates gas and water production
The base model for the parametric analysis is the model with average parameter values and during the analysis, each coal and shale parameter was systematically varied between end-member values, while all the other parameters are held at their average values and the resulting production over a 10 year history were compared
Summary
Coal gas production of stratigraphically and structurally complex coal measures is dependent on a myriad of interrelated variables. Isolating the contribution of intrinsic and extrinsic variables to productivity is challenging at best and commonly impossible. In coal measures, such as those of the Lower Cretaceous, Mannville Group, in the Western Canadian Sedimentary Basin, where multiple coal seams and organic rich shales occur, the problem is further compounded. M. Bustin 292 productivity, we have investigated the variation in producability of coals and associated organic rich gas shales through a parametric analysis using a numerical modelling program, which simulates gas and water production. The numerical models are grounded in field and laboratory analyses of coals throughout the producing Mannville fairway in Alberta [1]
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