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September 1994 daily production of 9403 MCFD and 65 BCPD from the No.1 Apache
13 and 1000 MCFD from the No.1 Apache 25. At the time of this repon, both Bass
Enterprises and Yates Petroleum were drilling and/or completing wells in this reservoir.
These wells are located in SW\4SE\4 sec. 12 T22S R30E and the SW1,4SW\4 of sec. 7
T22S R31E (Fig. SO).
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Xl-33
Based on subsurface mapping of this panicular reservoir, it appears that there is
excellent potential for similar Atoka production within the confmes of the WIPP land
withdrawal area. The net sand isolith map (Fig. 52) shows that good sand development
should be present in the western tier of sections within the WIPP land withdrawal area
(sees. 18, 19, 30, and the E1h of sec. 31 T22S R31E), giving up to seven 320-acre
proration units containing probable gas_resources in addition to the single location that
presently produces (Fig. 54). An addit:fonal stratigraphically equivalent sand trend is
mapped east of, and separated from, the existing production which may very well have
production of similar quality (Fig. 52). As no production has yet been established on this
trend, its ability to produce is rated at low to moderate probability. Eight additional
proration units are estimated as bearing probable resources under the WIPP land withdrawal
area (Fig. 54, Table 2). These 16 proration units have probable resources of
123,336 MMCF gas and 1,092 KBC. There are an additional 94,400 MMCF gas and 799
KBC as probable resources in 16 drilled and undrilled proration units within the one-mile
wide additional study area (Fig. 54, Table 3).
MORROW GROUP
The Morrow Group is found within the WIPP site area at depths of 12,900 to
more than 15.000 ft. The Morrow is divided into two distinct sections. an upper pan
designated the Morrow lime, which is roughly 650 ft thick and composed principally of
interbedded limestone and shale, and a lower part designated the Morrow clastic interval,
which is 600-700+ ft of interbedded sandstone and shale (F'JgS. SO, 56). Almost all
Morrow production in this area comes from the Morrow clastic section, which produces
principally nonassociated gas from multiple sandstones which were deposited in a variety
of deltaic depositional environments. These environments include channel, point-bar,
channel-mouth bar. beach. off-shore bar, and delta-front facies (Speer, 1993c). Trapping
is achieved in these sands by several mechanisms, which are generally some combination
of stratigraphic, structural, and/or diagenetic factors (Speer, 1993c). Structurally, the
Morrow mimics the Strawn in a regional sense, but seems to have more pronounced
nosing and closure over inferred underlying paleostructures (Fig. 52). These structural
anomalies appear in a general sense to enhance Morrow production.
Morrow production has been established from several wells along the western,
southern, and, toa lesser extent, the eastern margins of the WIPP land withdrawal area
(Fig. 47). Cumulative production from these wells has been varied. ranging from less
than 1 BCF to upward of 8 BCF per well. Most wells have produced only moderately, at
somewhat less than 2 BCF per well through 1993.