geothermal resource potential of the safford-san simon basin, arizona

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Conclusion Geothermal potential at depths greater than 1 km in the San Simon area may be good. In 1938 a deep oil and gas test, the Bunk Benevolent 1 Fee, was completed to 2,032 m depth. In a 1940 memorandum, E.D. Wilson of the Arizona Bureau of Mines gave an account of a visit to this well site where he was told that 134°C water was encountered in the lower 100 m of the hole (see Appendix 3). If this temperature accurately describes bottom conditions, the estimated temperature gradient is 57 o C/km. This temperature gradient is above the 46.6°C/km average, estimated using shallow (300 m) well data. Because the oil test gradient is above normal, lies in a possible fault zone (in a zone of steep WNW-trending structural contours of the blue clay) and reportedly encountered water at 2 km depths, the San Simon area may have good potential for 1 to 2.5 km depth geothermal resources between 100 and 140 o C. 77
Bowie Area Introduction At least 20 irrigation wells in the area surrounding Bowie pump 30 to 37°C water from depths of 183 to 610 m (Table 1, Figure 1). Chemical quality of the thermal water is good; TDS of these waters ranges mostly between 250 and 500 mg/l (Table 2). Fluoride concentrations are generally less than 3.0 mg/l; although a few wells produce water with fluoride over 7.0 mg/l. These thermal waters are useful for irrigation and a few are suitable for drinking because their fluoride contents are less than 1.4 mg/l. Geochemistry A wide variation of dissolved constituents occurs in the thermal waters at Bowie. Most of these waters are either sodium bicarbonate or sodium chloridesulfate chemistry, and they have no readily distinguishable correlation among chemical type and measured temperature. This may indicate that the variability in compositions is due to contact of these waters with different kinds of rock in shallow «600 m) aquifers. Chemical geothermometer calculations are also highly variable; thermal waters which have very low calcium and magnesium concentrations have the highest Na-K-Ca geothermometer temperatures (Table 3). Waters with relatively very low magnesium concentrations are frequently associated with the higher temperature zones of known geothermal systems (Ellis and Mahon, 1977). The sodium bicarbonate chemistry of these waters suggests that the reservoir is contained in basement rock composed of either fractured volcanic or felsic crystalline rocks. A deep reservoir temperature of l24°C is inferred by the Na-K-Ca geothermometer. In other waters, all of which have relatively high calcium concentration and which are trending toward sodium chloride-sulfate o chemistry, the calculated Na-K-Ca temperatures are all below 95 C. The Na-K-Ca 78
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GEOTHERMAL RESOURCE POTENTIAL OF TH
Page 5 and 6:
TABLE OF CONTENTS PAGE List Of Figu
Page 7 and 8:
FIGURES FIGURE 1 FIGURE 2 FIGURE 3
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TABLES TABLE 1 TABLE 2 2A 2B 2C 2D
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INTRODUCTION o In the Safford-San S
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Land Status Figure 2 shows land own
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asin are published in Andreasen and
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114° 112° IIO O 108° 106° 104°
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I.D ". ". '. ". ..... ",/" '. ~~~ ~
Page 22 and 23:
side of the mountains and coincide
Page 24 and 25:
stress fields may dilate some of th
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I-' Ln !' .. "," "" ,,... P.c Tucso
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The upper basaltic andesite, overly
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over an inferred decollement in the
Page 32 and 33:
attitudes of the thrust faults, rev
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gradation is observed only in certa
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to depth of 555 meters (Knechtel, 1
Page 38 and 39: asal conglomerate facies of the low
Page 40 and 41: Indian Hot Springs-Gila Valley Intr
Page 42 and 43: flow. A fault zone(s) is inferred t
Page 44 and 45: DWG. NO.-R.-IJ.-~ CALCULATED THICKN
Page 46 and 47: Geophysics, 1979). Nearby at Saffor
Page 48 and 49: Buena Vista Area Introduction More
Page 50 and 51: / I / / / / / / / / / / I / / / / /
Page 52 and 53: 33 34 31 T6S T7S
Page 54 and 55: GElEIEEOl'3,53IEEa3lljO Mile E] B R
Page 56 and 57: similar to the Precambrian granite
Page 58 and 59: 100 + + + + 300 + 500 ~ + + + + + +
Page 60 and 61: 500 m interval, while 1.2 HFU is re
Page 62 and 63: tN I \ 5 IOMiles \ ""1. EXPLANATION
Page 64 and 65: are interpreted as evidence of a ma
Page 66 and 67: LINE 7 RESISTIVITY N =2000 FEET, DI
Page 68 and 69: 100 200 0...---..."...-------------
Page 70 and 71: Artesia in D-8-26-32 and 33 have es
Page 72 and 73: trending 1.5 km 2 closures with soi
Page 74 and 75: waters occur in confined or artesia
Page 76 and 77: Equation (1) Alumino-silicate + H 2
Page 78 and 79: Silica concentration in Figure 24 i
Page 80 and 81: San Simon Introduction The San Simo
Page 82 and 83: Geology Subsurface geology controls
Page 84 and 85: " " '"",.- ~--- ,....~, ~. 7 '1.v-~
Page 86 and 87: o 1 Mile '2, WATER LEVEL OF WELLS I
Page 90 and 91: geothermometry for waters containin
Page 92 and 93: GRAVITY MODEL OF THE BOWIE AREA Mod
Page 94 and 95: TRANSVERSE TOPOGRAPHIC PROALES ACRO
Page 96 and 97: probably correlative with the "blue
Page 98 and 99: excellent chemical quality suitable
Page 100 and 101: Table 1 Wells With Measured Tempera
Page 102 and 103: Table 1 cont. Wells With Measured T
Page 104 and 105: Table 1 cant. Wells With Measured T
Page 106 and 107: Table 2A. Analyses of Gila Valley-I
Page 108 and 109: Table 2B. Analyses of Buena Vista a
Page 110 and 111: Table 2C. Analyses of Cactus Flat-A
Page 112 and 113: Tabl~ 2E. Analyses of Bowie area gr
Page 114 and 115: Table 3A Geothermometers for the Gi
Page 116 and 117: Table 3C. Geothermorneters for the
Page 118 and 119: Table 3E. Geothermometers for the B
Page 120 and 121: Table 4. Summary table showing aqui
Page 122 and 123: Summary of description of Core Lith
Page 124 and 125: D-7-27-2cdb Driller's log Surface s
Page 126 and 127: APPENDIX 2 pH Correction for the Si
Page 128 and 129: By converting milligrams per liter
Page 130 and 131: APPENDIX 3 Arizona Bureau of Mines
Page 132 and 133: BIBLIOGRAPHY Aiken~ C. L. V., 1978,
Page 134 and 135: -3- Davidson, E. S., and Cooley, M.
Page 136 and 137: -5- Fournier, R. O. and Truesdell,
Page 138 and 139:
7 Marjaniemi, ,D. K., 1968, Geologi
Page 140 and 141:
-9- Scarborough, R. B., 1975, Chemi
Page 142:
Van Horn, W. L., 1958, Late Cenozoi
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geothermal resource potential of the safford-san simon basin, arizona

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