of the Glasco Field
The #1 Maria is situated
in the Glasco Field Extension located along the northern flank of the Midland
Basin on the Glasco faulted, anticlinal structure in Gaines and Andrews
Counties, Texas. Both the Devonian and Ellenberger Formations are found
productive on this anticlinal trend and both formations are prospective on the
The primary objective of the #1 Maria was the
prolific Devonian Formation. The deeper Ellenburger formation is a secondary
objective in years to come. Both the Devonian and Ellenburger formations are
karsted ramp carbonates, which are typically found extremely productive on
closed and faulted anticlinal features in the region. They both produce as
bottom water drive formations. The geological and geophysical evidence for the
#1 Maria supported this anticlinal anomaly.
Structural anticlinal features of the Devonian
Formation tend to over-lay Ellenburger structural trends throughout the Midland
Basin region. The Devonian Formation is overlain by the Woodford shale, as the
Ellenburger Formation is overlain by the Simpson shale. Both shales act as
hydrocarbon source beds as well as seals to hydrocarbon migration. The rock
quality is dolomized, with vertical fractures, horzontal fractures, large and
small vugs, pin point porosity and excellent matrix porosity.
The nearest significant Devonian and Ellenburger
production was noted occurring in the Glasco Field, adjacent to the Glasco
Extension Field. The Glasco field was discovered in 1953 and has produced over
20.97 million barrels of oil from 28 Devonian wells, which is an average of
748,000 barrels per well in the field. The Ellenburger Formation was discovered
to be productive in the mid 1980's by deepening older Devonian producers, and
has produced over 2.7 million barrels of oil. Estimated ultimate oil recovery
for the Ellenburger Formation is 500, 000 per well.
The #1 Maria was a successful Devonian completion.
As planned, two additional Devonian wells will be drilled followed by two
Ellenburger wells. Using the established averages for Devonian and Ellenburger
completions, Sloan/EGL expects to recover in excess of three (3) million
barrels of oil.
The Glasco Field and Extension
(click to view
"The only way to drive cattle fast, is to drive 'em
||Core sample showing vertical fractures
|Core sample showing Oil Vugs
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