Abstract
From the axis of the Delaware basin to the western monocline, the upper Delaware sandstone exhibits a regular progression from gas-bearing structures to oil-bearing structures updip, an example of Gussow's migration theory. Beginning in western Reeves County, Texas, the monocline has trends of clean sandstone encased in very shaly laminated siltstone. These stratigraphic traps contain such perplexing fluid relationships as water above oil, and gas downdip from oil, both in the same correlative electric-log zone. The writer submits that these phenomena are caused by the entrapment of different fluids in lenses within a sandstone body. Membranes with various low permeabilities form the boundaries of the sub-lenses and control the migration of various fluids. End_of_Article - Last_Page 2074------------
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