Click on image for enlargement.

Cross-section showing major stratigraphic surfaces and reservoir zonation scheme. Stratigraphic surfaces, in ascending order, are: Tournaisian (Tour_MFS); Early Visean (Evis_SSB); Late Visean (Lvis1_MFS), (Lvis_SSB), and (Lvis13_csb); Serpukhovian (Serp_SSB); and Bashkirian (Bash_SSB). Reservoir zones bracketed by these surfaces are: Visean D, Visean C, Visean B, Visean A, Serp, and Bash.