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<br /> DEPTH, <br /> BOREHOLE DIAMETER, IN RESISTIVITY, <br /> IN INCHES FEET IN OHM. METERS SPECIFIC YIELD, IN PERCENT <br />6 11 2,200 1 10 100 1,000 30 20 10 0 <br /> I <br /> I -::: <br /> I <br /> I <br /> \.....CALlPER -"'-' <br /> I __GAMMA ,- <br /> I J <br /> I '- <br /> .- <br /> I ~ <br /> '....}WASH- ? <br /> -- <br /> --~ <br /> ~ OUT - <br /> I '- , <br /> I RESISTIVITY- --, <br /> I S- <br /> I <.::. <br /> I _SPECIFIC <br /> , -2 YIELD <br /> I - <br /> I DENSITY-C..> <br /> , <br /> \ POROSITY <br /> I <br /> I <br /> I <br /> I '- <br /> I ~ <br /> I 2,300 1 <br /> I \. <br /> I <br /> I -::... ~ <br /> I :..-, <br /> I <. <br /> I - <br /> \ " <br /> I -::, <br /> I .... <br /> , "- <br /> I -:;...., <br /> , .... <br /> , t...__..., <br /> I - <br /> ~- <br /> ::,-) }WASHOUT r::==~ -- <br /> , <br /> I ./ <br /> I cl' <br /> \ C::=::::...., <br /> I -~ <br /> I <--::. <br /> I I <br /> I '- <br /> I -- <br /> I , <br /> 2,400 r~ <br />0 100 200 40 30 20 10 0 <br /> <br /> <br /> <br />GAMMA RADIATION, DENSITY POROSITY, IN PERCENT <br />IN API UNITS <br />Figure 8. Calculated specific.yield log and related caliper, gamma, resistivity, and <br />porosity logs lor a 2DO.loot interval in well USGS. <br /> <br />SPECIFIC-YIELD ESTIMATES FROM GEOPHYSICAL LOGS 17 <br />