Map showing structure of the Permian (Guadalupian) Capitan Aquifer, southeastern New Mexico and western Texas
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Geology topics
Publications and source records attributed to William L. Hiss.
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The ground-water potential of 5 areas in central-western New Mexico within 85 miles (135 km) of Gallup, N. Mex. was evaluated by reviewing the published literature, inspecting aerial and space photographs, and interviewing ranchers and personnel employed by well-drilling and mineral-exploration companies by telephone. The San Andres Limestone and underlying Glorieta Sandstone of Permian age are the oldest aquifers capable of yielding water of a quality suitable for municipal use. Extreme local variations in hydraulic conductivity and water quality reflect a karstic topography developed on the San Andres Limestone prior to burial by Upper Triassic sediments. The San Andres Limestone and Glorieta Sandstone form an important aquifer in the Grants-Bluewater area where yields of as much as 2,200 gallons per minute (140 l/s) have been obtained. Yields from wells completed in the San Andres-Glorieta aquifer on the Chaco slope and in the Gallup sag-Mogollon slope on the northeast and southeast flanks, respectively, of the Zuni uplift will be much less than those prevailing in the Grants-Bluewater area. Water quality in the San Andres Limestone and Glorieta Sandstone deteriorates with distance away from the axis of the Zuni uplift. Sandstones of Triassic, Jurassic, and Cretaceous age are potential aquifers wherever they are present. Yields to wells tapping these aquifers are generally less than 200 gallons per minute (13 l/s) due to the relatively low hydraulic conductivity. Wells tapping alluvium of Late Cenozoic age along the Rio San Jose and Puerco River and interbedded volcanics and alluvium elsewhere in the area generally yield less than 100 gallons per minute (6 l/s) of water. Tributaries ,of the Rio San Jose that have eroded canyons into Paleozoic and Mesozoic rocks east of the Continental Divide and south of the eastern part of the Zuni uplift have been repeatedly displaced and (or) covered by Quaternary volcanic rocks. The exact location, extent, and depth of buried alluvium in the Late Tertiary valleys is unknown. Water enters the volcanic rocks as rainfall and snowmelt and probably passes quickly into and through, the underlying alluvium into Jurassic and Cretaceous strata. The Gallup Sandstone in the lower part of the Mesaverde Group and the San Andres Limestone and Glorieta Sandstone (combined) are potential sources of water in the North Plains-Malpais area. Sustained yields of 500 to 800 gallons per minute (30 to 50 l/s) can be expected from wells completed in the Gallup Sandstone of Cretaceous age in areas west and north of the Zuni uplift. Properly completed wells tapping the Dakota Sandstone of Cretaceous age and the Westwater Canyon Sandstone Member of the Morrison Formation of Jurassic age locally yield 100 to 250 gallons per minute (6 to 15 l/s) north and east of Gallup. Additional supplies of ground water could be developed from these aquifers. However, arrangements to purchase or lease the water would probably need to be made before these resources could be exploited. Approximately 3,000 gallons per minute (190 l/s) of ground water is being pumped from the Westwater Canyon Member of the Morrison Formation at two uranium mines located about 12 miles (20 km) northeast of Gallup in the Church Rock mining district. The water is pumped into settling ponds at the surface. Effluent from the ponds is allowed to flow into arroyos draining into the Puerco River. Some of the waste water will be used in an ore-processing mill that is expected to be constructed near the mines. However, additional waste water will probably be available from other mines that reportedly will be located in the same mining district. Water salvaged from the current mining operations and (or) pumped from abandoned uranium mines constitutes the most readily available and dependable source of new ground-water supplies for the city of Gallup. The water contains dissolved uranium but is otherwise of better quality than that now avai
The Ray-1 well was to be the third production well completed in the city of Gallup Yah-ta-hey well field located about 7 miles (11 km) north of the city. The first string of casing collapsed during completion, however, and the well was abandoned before it could be tested. The lithology of the Upper Cretaceous Dalton Sandstone and Dilco Coal Members of the Crevasse Canyon Formation and the Gallup Sandstone was interpreted from geophysical logs and examination of the drill cuttings. These units appear to be similar to correlative strata encountered in the first two wells. A yield of approximately 700 gallons per minute (44 l/s), similar to the other wells in the Yah-ta-hey well field, is anticipated from the same aquifers when the Ray-1 replacement well is completed.
Approximately 8,000 chemical analyses of water produced from formations of several geologic ages in south eastern New Mexico and western Texas are tabulated by both geographic location and geologic formation. Empirical and mathematical relationships between (1) the dissolved solids and the measured and computed resistivity of water, the chloride-ion concentration and the density, and (2) the concentration of chloride-ion and the density and the resistivity of water, were established. Resistivities of water computed following a method developed by Moore, Szasz, and Whitney (1966) using the concentration of the six most common constituents dissolved in natural water correlate favorably with the measured resistivities of natural water. The water analyses were obtained chiefly from oil companies and oil-service companies operating in the western part of the Permian basin. The data were associated with the proper well by searching location, operator, and reference number cross indexes prepared from the Permian Basin Well Data System files. The cross indexes were determined to be essential to efficient data processing operations. After preliminary screening for nonrepresentative data, all data were indexed to the Permian Basin Well Data System magnetic tape file scout records by the unique reference number. The data were then coded, punched into tabulating cards, and stored on magnetic tape for computer operations. Data verification steps not normally required when using data received from a laboratory following standardized analytical techniques on samples obtained under standardized and controlled procedures were performed in order to upgrade reliability of the information. Data errors detected included poorly located or identified samples; mistakes including reproducing, or key punching; laboratory errors; inconsistent reporting; and nonrepresentative or contaminated samples.