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<br />'4
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<br />".'
<br />"1
<br />4
<br />
<br />N aftz and Spangler
<br />
<br />SAN JUAN RIVER
<br />~
<br />
<br /> Z 12,000
<br /> 0 ...
<br /> ;:: WELL Nl9
<br /> -< " 10,000
<br /> "'"
<br /> f-<f-< .~. .
<br />N z-
<br />",-> 8,000
<br />..- u"
<br />z'" .l.
<br />CO 0'"
<br />Uoo WELL N,25 ..'
<br /> oo::;:
<br />....,' Q -< 6,000
<br /> -"
<br /> ->", ..-
<br /> 0_
<br /> ~:j 4,000
<br /> Q-
<br /> [;' ::;: WELL N4S
<br /> - ~- ~.
<br /> ->z 2,000 -. ~-
<br /> 0-
<br /> oo
<br /> oo . -~--
<br /> is e...'
<br /> 0
<br /> 1957 1961 1965 1969 1973 1977 1981 1985 1989 1993
<br /> YEAR
<br />
<br />Figure 2. Increases in Dissa'ved~Solids Concentration With
<br />Time in Water from Selected Wells Completed
<br />in the Navajo Aquifer in the Study Area.
<br />
<br />.1
<br />
<br />increase in base flow in the San Juan River: in the
<br />study area has been measured by Avery (19136) and
<br />attributed to seep,age from the Navajo and other over-
<br />lying aquifers. The potential for vertical ground-water
<br />movement due to differences in hydraulic heads
<br />between the aquifers in the study area (Figure 3)
<br />indicates that natural leakage of saline water from
<br />the Middle Paleozoic aquifer (Leadville Limestone)
<br />and Upper Paleozoic aquifers and confining units
<br />(Hermosa Group) to the Navajo aquifer is not likely
<br />(Weiss, 1987; Kimball, 1992). Head differences indi-
<br />cate that natural leakage of saline water from the
<br />Upper Paleozoic aquifer (Cutler Formation) into the
<br />Navajo aquifer is possible (Figure 3).
<br />Ground water is the major source of wa,ter for
<br />domestic, livestock, and oil-field uses in the study
<br />area. A number of oil test holes and depleted produc-
<br />ing wells have been plugged back and converted to
<br />
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<br />,~
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<br />',j
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<br />
<br />
<br />UPPER MESOZOIC
<br />....... AQUIFER (DAKOTA
<br />SANDSTONE)
<br />
<br />" MIDDLE MESOZOIC
<br />AQUIFERS AND
<br />CONFINING UNITS
<br />(MORRISON
<br />\ FORMATION)
<br />
<br />LOWER MESOZOIC
<br />, CONFINING UNITS
<br />(CHlNLEAND
<br />MOENKOPI
<br />FORMATIONS)
<br />
<br />\ UPPER PALEOZOIC
<br />AQUIFERS AND
<br />CONFINING UNITS
<br />(HERMOSA GROUP)
<br />
<br />jJ
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<br />,
<br />,cl
<br />
<br />MIDDLE
<br />MESOZOId
<br />AQUIFER .
<br />(ENTRADA'
<br />NAVAJO :
<br />SANDSTONES)
<br />
<br />UPPER :
<br />PALEOZOIC ___
<br />AQUIFER '
<br />(CUTLER ~.
<br />FORMATIO"J
<br />,
<br />
<br />MIDDLE ,
<br />PALEOZOIq:
<br />AQUIFER ,
<br />(LEADVII4,
<br />LIMESTONE) ,
<br />
<br />SOUTH
<br />
<br />NORTH
<br />
<br />~
<br />~
<br />"
<br />'~
<br />,:~
<br />~
<br />,~
<br />"
<br />"
<br />\\
<br />~
<br />~
<br />~
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<br />';ii
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<br />-J
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<br />,11
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<br />
<br />A YERAGE DEPTH BELOW LAND SURFACE TO TOP OF HYDROGEOWGIC
<br />UNITS IN THE VICINITY OF THE GREATER ANETH OIL FIELD
<br />
<br />MlDDlE MESOZOIC AQUIFERS AND CONFINING UNITS
<br />(MORRISON FORMATION~BLUFF SANDSTONE MEMBER = 265 FEET)
<br />
<br />MIDDLE MESOZOIC AQUIFER
<br />(ENTRADA SANDSTONE := 550 FEET)
<br />(NAVAJO SANDSTONE := 775 FEET)
<br />
<br />LOWER MESOZOIC CONFINING UNITS
<br />(CHINLE FORMATION = 1.475 FEET)
<br />
<br />UPPER PALEOZOIC AQUIFER
<br />(CUTLER FORMATION = 2,640 FEET)
<br />
<br />UPPER PALEOZOIC AQUIFERS AND CONFINING UNITS
<br />(HERMOSA GROUP = 4,585 FEET)
<br />
<br />MIDDLE PALEOZOIC AQUIFER
<br />(LEADVILLE LIMESTONE = 6,910 FEET)
<br />
<br />Figure 3. Schematic;Cross Section Showing Aquifers and Confining Units Within the Greater Aneth Oil Field, Utah.
<br />Arrows indicate Potcntial for vertical ground-water movement due to hydraulic head differences. Direction of
<br />ground-water inovement summarizcd from Thomas (1989); Freethey and Cordy (1991); and Weiss (1991).
<br />
<br />WATER RESOURCES BUL;LETIN
<br />
<br />1122
<br />
<br />
<br />;. j,',.'''',,,
<br />
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