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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />;'. <br />I <br />I <br />I <br />I <br /> <br />O() <br />1'-' 29, 1986. The purpose of the 1 oggi ng was to determi ne the flow <br />0J characteristics and general water-quality characteristics of HSU-2 and HSU-3 <br />'.::.:J <br />C~ in the Alamosa area. The logs run in the Carroll Well were: <br />1. Temperature <br />2. Borehole-fluid resistivity <br />3. Casing-collar locator <br />4, Borehole flowmeter ("spinner") <br /> <br />Borehole temperature and flUid-resistivity logs, as well as the spinner <br />log, were run to attempt to ascertain the zones of water production from HSU-2 <br />and HSU-3. The casing-collar locator was used to verify the reported slotted <br />intervals in the well casing. All of the logs were successfully run in the <br />Carroll well, though a problem with the electronics in the spinner probe <br />caused a one-day delay for repair. Following repair, that log was run <br />successfully. <br /> <br />The suspected water-quality degradation from HSU-2 to HSU-3 appears to <br />have been confirmed for the Carroll Well vicinity by the geophysical logging. <br />Interpretation of the spinner log indicates that less than ten percent of the <br />flow from the Carroll Well is contributed from the depth interval 2180 feet to <br />2620 feet (Figure 2.8). This zone is interpreted to be the upper portion of <br />HSU-3. About 90 to 95 percent of the flow is contributed from the interval <br />1820 feet to 2180 feet. From the casing-collar locator log, the casing <br />appears to be perforated in the interval 1750 feet to about 2500 feet. The <br />interval 2500 feet to 2620 feet appears to be open hole. There is no <br />contribution or loss to flow from the well above 1820 feet. <br /> <br />The fluid-resistivity log and the temperature log indicate an abrupt <br />water-quality change at a depth of about 2080 feet. These two logs have been <br />used to compute the OS concentration with depth in the well. At 2080 feet, <br />down to a depth of about 2160 feet, the water quality changes from about 220- <br />240 mg/L OS concentration (NaCl equivalent) to about 400 mg/L. Measurements <br />of specific conductance of the water flowing from the Carroll Well indicated a <br />NaCl-equivalent OS concentration of about 200 to 250 mg/l. By comparison, a <br />laboratory analysis of water from the Carroll Well showed a OS concentration <br /> <br />2-6 <br />