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

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geothermometry for waters containing higher calcium, chloride, and sulfate concentrations are believed unreliable due to possible mixing, dissolution of gypsum, and cation exchange reactions with clay in the basin-fill sediments. Na-K-Ca geothermometry assumes that temperature-dependent equilibrium with silicate minerals in the reservoir has occurred and that no additional reactions have changed the ratios of sodium, potassium, and calcium after the thermal water leaves the deep reservoir (Fournier and others, 1974). Figure 30 is a map of the Bowie area showing the distribution of the Na-K-Ca geothermometer temperatures. Wells with the highest Na-K-Ca temperatures may overlie fractured basement, which is leaking thermal water into shallow «600 m) aquifers. Additional studies are required to confirm the high Na-K Ca geothermometer temperatures obtained using the low magnesium, sodium bicarbonate waters because the sodium, potassium and calcium ratios may also reflect shallow nontemperature-dependent dissolution of silicate minerals in a high dissolved carbon dioxide environment (Paces, 1975). Structure and Stratigraphy Geophysical studies by Eaton (1972) and drillers' logs provide a basis to describe the subsurface geology in the Bowie area. Eaton (1972) published a subsurface model of structure based upon an accompanying gravity profile. Figure 31 shows Eaton's structural model and gravity profile. His profile locations are shown in Figure 32, Gravity interpretation by Eaton (1972) shows a graben, which is about five miles wide and filled with up to 760 m of clastic sediment. Tertiary volcanic rock, 300 to 600 m thickness, are modeled to underlie the basin-fill sediments. Drillers' logs published in 'fuite (1963) and White and Smith (1965) show the stratigraphy of the upper portion of the basin-filling sediments in the Bowie graben (see drillers' logs in the appendix), A "blue clay" strata, 79
MAP SHOWING DISTRIBUTION OF Na-K-Ca GEOTHERMOMETER TEMPERATURES - BOWIE AREA ') to 10 .' \ \ ~." "n ',. 21 \ " ;!i "'-: ;- ....
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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
Page 9 and 10:
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
Page 16 and 17:
asin are published in Andreasen and
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114° 112° IIO O 108° 106° 104°
Page 20 and 21:
I.D ". ". '. ". ..... ",/" '. ~~~ ~
Page 22 and 23:
side of the mountains and coincide
Page 24 and 25:
stress fields may dilate some of th
Page 26 and 27:
I-' Ln !' .. "," "" ,,... P.c Tucso
Page 28 and 29:
The upper basaltic andesite, overly
Page 30 and 31:
over an inferred decollement in the
Page 32 and 33:
attitudes of the thrust faults, rev
Page 34 and 35:
gradation is observed only in certa
Page 36 and 37:
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 88 and 89: Conclusion Geothermal potential at
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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