ERHC Energy Inc (ERHE)

[ERHClongtimer]

OC, I think the press release was referring to the areal extent of the traps (top image below):



Closure. In map view (top), closure is the area within the deepest structural contour that forms a trapping geometry, in this case 1300 ft [390 m].
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Closure

2. n. [Geology]
The area, or areal closure, included in the lowest closing contour of a trap. Measurements of both the areal closure and the distance from the apex to the lowest closing contour are typically incorporated in calculations of the estimated hydrocarbon content of a trap.

SOURCE: http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=closure

So, yes, this translates to what could look like a blob.

Basically then, the press release is indicating that if the traps contain oil, there is going to be a lot of it, because they enclose large areas (horizontal extent), provided the oil-bearing layers are also thick (vertical extent)!

There is another definition of closure, which refers to the vertical extent (bottom image above, see link).