Crossplots of porosity vs. permeability from various North American basins show that there is
a continuum between conventional, tight and shale gas reservoirs. This is significant as
some of the key issues, particularly in shale and tight gas reservoirs, are having good
estimates of storage and flow capacity. The crossplots include data from the Fayettville,
Barnett, Ohio and Marcellus shales in the United States; Horn River and soft shales in
Canada, tight gas Nikanassin formation in Canada and several conventional North …