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

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to depth of 555 meters (Knechtel, 1938). No comglomerate was encountered at depth in this well. However, in the Mary Mack well at Pima, Harbour (1966) interprets the basal conglomerate at 442 to 1,148 meters. A driller's log of the basal conglomerate facies in the Mary Mack well shows red sand interbedded with shale and gravel. Pre-"Basin and Range" rocks (bedrock) are not believed to have been encountered by this well because deep sediments encountered by this well produced copious quantities of water, suggestive of poorly indurated and permeable sediment. The finer-grained lithology of these sediments may indicate deposition in the axis of the basin. The driller's log of the Southern Pacific well at Safford reported by Knechtel (1938) is interpreted by Harbour (1966) to show the evaporite facies and the green clay facies of the lower basin-fill stratigraphic unit. Between 213 and 555 meters of yellow gypsiferous clay and salty clay are classified in an evaporite facies. South of Safford, another Southern Pacific well at Tanque encountered gypsum and clay at a depth of 180 meters. The bottom 10 meters is in gypsum (Knechtel, 1938). Harbour (1966) interprets these sediments as the evaporite facies. Green clay overlies the gypsiferous deposits in both wells and is called "blue clay" by the local drillers. Where green clay facies outcrops in the Safford area, it shows conformable thin bedded or laminated green and yellow clay layers with sharp contacts. Northwest of Safford the green clay facies becomes coarser, with alternating red and green clay layers that become increasingly red, silty, and sandy. The red silt and sand interbedded with red and brown clay is the red facies of Harbour (1966). The red facies overlies the basal conglomerate in the Mary Mack well. Both the red facies and green clay facies appear to grade into each other and into the evaporite facies towards the center of the depositional basin. The basal conglomerate probably intertongues with the 25
evaporite facies and green clay/red facies at their bases and on their margins. The center of basin-fill deposition appears to be at Safford because the Southern Pacific well at Safford has the greatest thickness and deepest known occurrence of clay and evaporite deposits in the basin. Note, however, that the Southern Pacific well at Tanque encounters gypsum a couple of hundred feet higher in elevation than the well at Safford. This might indicate a separate depositional basin or that the center of the depositional basin is south of Safford in the vicinity of Tanque. Two subfacies are identified by Harbour (1966) in the green clay facies. Near San Jose northeast of Safford, a sequence of well sorted .and crossbedded sandstone interbedded with rounded gravel clasts intertongues into the green clay facies. Harbour (1966) interprets these sediments as deltaic deposits. These sediments are called the delta facies, and they are confined to the area east and north of San Jose. The other subfacies occurs in discontinuous exposures at the top of the green facies and is called the calcareous facies. The calcareous facies consists of calcareous zones and thin oolitic limestones or gypsiferous, salty, limonitic, clayey-siltstone interbedded in yellow or green clay. Harbour (1966) believes the calcareous facies represents the dessication (drying up) of the lake(s) that provided the depositional environment for the green clay facies and evaporite facies. The calcareous facies is not present everywhere due to probable erosion prior to deposition of the dominantly coarse-grained upper basin fill stratigraphic unit. The upper basin fill disconformably overlies the green clay facies. The upper basin-fill stratigraphic unit will not be discussed in detail because its position precludes any potential as a geothermal reservoir. The upper b.asin-fill stratigraphic unit occurs mostly on basin margins and on the basin pediments where it probably grades into the 26
Page 1: 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
Page 11: INTRODUCTION o In the Safford-San S
Page 14 and 15: Land Status Figure 2 shows land own
Page 16 and 17: asin are published in Andreasen and
Page 18 and 19: 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 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 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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