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

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San Simon Introduction The San Simon area lies astride Interstate 10 in the southern Safford- San Simon Basin and includes the small farming and railroad community of San Simon. Prior to extensive ground water withdrawal and attendant water table lowering, the area had numerous thermal artesian wells, which were used for irrigating crops. Because the upper static water table was relatively deep and the means for pumping from this aquifer was not feasible during the early 1900s, deep wells were drilled to tap an artesian aquifer, which was discovered during drilling for water by the Southern Pacific Railroad. Schwennessen (1917) studied the geohydrology in this area and published data on these artesian wells. Thermal Regime Schwennessen's data are used to determine the thermal regime of the area prior to extensive ground water withdrawal. Figure 25 is a plot of well depth versus surface discharge temperature of artesian wells reported by Schwennessen (1917). Wells with flow rates less than 10 gpm and an artesian head less than 3 m above the surface are not used. A linear relationship between the well depths and the measured discharge temperatures exists, which has a slope or temperature gradient of 46.6°C/km. o The surface intercept temperature is 18.5 C, which is close to the mean annual temperature, l7 o C. In the San Simon area, these data indicate the general thermal regime of the basin is created by conductive flow of heat through the basin-filling sediments. This means that the temperature of the confined aquifers increases systematically with depth. 69
1000 AVERAGE TEMPERATURE GRADIENT OF THE SAN , SIMON AREA USING ARTESIAN WELL DATA FROM \ • \ SCHWENNESEN, 1917 AND ASSUMING DISCHARGE TEMPERATURE IS BOTTOM HOLE TEMPERATURE , ,, • -en a: w I W ~-..J W > W ..J « w900 en w > oaJ « J: I a. w c • .. • • • • • • • Slope 46.6 °C/km Sea level temperature 70.44°C , Approximate surface temperature IS.5°C (3650" Mean annual temperature I'ZO° C " COffe/ation QS2527 , ·Well with flow rate greater than 10 gpm " and head greater tt,an 10 feet. \ \ \ 800 \ \ 22 23 24 25 26 27 28 29 30 31 32 33 34 35 TEMPERATURE (OC) Figure 25. Temperature versus depth data for artesian wells in the San Simon area. 70
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GEOTHERMAL RESOURCE POTENTIAL OF TH
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TABLE OF CONTENTS PAGE List Of Figu
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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
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 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 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
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BIBLIOGRAPHY Aiken~ C. L. V., 1978,
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-3- Davidson, E. S., and Cooley, M.
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-5- Fournier, R. O. and Truesdell,
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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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