The Midale in the Weyburn area is carbonates and evaporites deposited near a low-energy shoreline on a marine ramp. The main producing carbonate facies (“vuggy pack-stone” facies) is shoal deposits of fossiliferous, peloidal, ''Ortonella''-bearing nodular wacke-stones to grainstones. The principal occluding cements are sparry calcite and anhydrite. | The Midale in the Weyburn area is carbonates and evaporites deposited near a low-energy shoreline on a marine ramp. The main producing carbonate facies (“vuggy pack-stone” facies) is shoal deposits of fossiliferous, peloidal, ''Ortonella''-bearing nodular wacke-stones to grainstones. The principal occluding cements are sparry calcite and anhydrite. |