Abstract
From the axis of the Delaware basin to the western homocline, upper Bell Canyon-sandstone pools exhibit a regular progression from gas-bearing structures down dip to oil-bearing stratigraphic traps up dip--an example of Gussow's principle of differential entrapment. Starting in western Reeves County, Texas, the homocline contains trends of clean sandstone encased in very shaly, laminated siltstone. These stratigraphic traps exhibit perplexing fluid relationships such as water above oil, and gas down dip from oil, both phenomena occurring in the same stratigraphic zone, as shown by electric-log correlations. The writer submits that these phenomena are caused by the entrapment of different fluids in sublenses within a clean sandstone body. Membranes with low permeabilities form the boundaries of the sublenses and control the migration of various fluids.
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