Publisher's Synopsis
Excerpt from Factors Controlling Oil-Well Completions in the Illinois Basin
Cypress sandstone. The Cypress sandstone is one of the most impor tant producing sand formations in the Illinois basin. It usually has one to three sandstone zones. The upper one is locally a green sand and is commonly known as the upper Weiler. In general, it is not impor tant because it is tight and calcare ous but in some fields it is a well developed reservoir. The sand which has its top about 20 to 40 ft. Under the Barlow limestone is the princi pal producing sand. In some wells this sand is divided by shale so as to make three Cypress sands in all. The sands range from fine to medi um grained, well sorted to poorly sorted quartz sand with low to high permeability and porosity. Lateral variations in texture and porosity are common and thin shaly lenses are numerous. Although many of the fields have a definite water table, the oil-'water contact is usu ally gradational so that even though the well cores show apparently good saturation the sand will produce wa ter in some localities when tested.
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