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<br />w <br />Ul <br />W <br />0) <br /> <br />CONTENTS <br /> <br />Abstract .............................................................................................................................. ............................. <br />I nt roduction .............................................................................................................................. ....................... <br />Purpose and scope.......................................................................................................................... ........ <br />Previous investigations..... ...... ... ...... ..................... ....... ......... ..... .... .... ........................ ...... ......... ........ ..... <br />Ac know ledgment s .............................................................................................................................. ... <br />Description of study area............. .................................................. ............... .................. ...... ......... .............. ..... <br />Geographic selling .... .... .......................... ................... .... .... ....... .... ..................... ...... ............. ................. <br />Geologic set ti ng .............................................................................................................................. ....... <br />History of oil-field development ......................... ........ ....................................... ... ........................... ..... <br />Water use in the study area .............................................................:...................................................... <br /> <br />Hydrologic selli ng .............................................................................................................................. .............. <br />Surface water .............................................................................................................................. .......... <br />Ground water ...... ..... ...... ...... ...... ........... ................ ..................... ............................. ..... .......................... <br />The Navajo aquifer ...................... ............ ...... ............................................... ......... .................... <br /> <br />Recharge ........................................................................................................................... <br />Discharge..................................................................................................................... ..... <br />Water-level declines ....... ........... ........................ ............. ............. ...................................... <br />Potential for venical movement ................................................................................................... <br />Potential avenues of ground-water movement ............................................................................. <br />Sampling, analytical methods, and quality assurance ...................................................................................... <br />Chemical quality of ground water ................................................................................................................... <br />Variations in salinity of water in the Navajo aquifer ............................................................................. <br />Sources of salinity to the Navajo aquifer .............................................................................................. <br />Geochemical characterization of salinity in the Navajo aquifer ........................................................... <br />Bromide-to-chloride ratios ... ................... ..... ........ ............................................. ............ ....... ....... <br />Iodide-to-ch loride ratios ............... ................................. ............ .... ......... ........ ..................... ........ <br />Oxygen and hydrogen isotopes...... ................... ............... ......... .......... .... .................................... <br /> <br />Strontium isotopes...... ............ ........ ..... ........ ........ ...... ................ ......................................... ......... <br />Statistical similarity between ground-water samples.... ''''''..'' .......... ............................... ...................... <br />Results and need for additional data ................................................................................................................ <br /> <br />Summary ...... ... ....... ......... ... ... ....................... .... .... ........ ........ ... ....... .... ......... ... ..... ............. ................ ...... ...... .... <br /> <br />References.................................................................................................................... .................................... <br /> <br />PLATE <br /> <br />IPlate in pocket] <br /> <br />I. Map showing quality of water from selected wells and springs in the Navajo and other aquifers in <br />and near the Greater Aneth Oil Field, San Juan County, Utah <br /> <br />FIGURES <br /> <br />I. Map showing location of study area, physiographic features, and Greater Aneth and satellite oil <br />fields, southeastern San Juan County, Utah ...................................................................................... 3 <br />2. Diagram showing numbering system for geohydrologic-data sites in Utah ...................................... 6 <br />3. Schematic cross section of hydrogeologic units in the vicinity of the Greater Aneth Oil Field, <br />southeastern San Juan County, Utah .................................................................................................. 8 <br /> <br />I <br />2 <br />2 <br />4 <br />5 <br />5 <br />5 <br />7 <br />9 <br />10 <br />II <br />11 <br />13 <br />14 <br />\5 <br />15 <br />18 <br />21 <br />29 <br />30 <br />34 <br />58 <br />60 <br />62 <br />62 <br />67 <br />67 <br />73 <br />80 <br />84 <br />86 <br />87 <br /> <br />iiI <br />