Item talk:Q244653
From geokb
{
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"name": "Geochemical and isotopic variations in shallow groundwater in areas of the Fayetteville Shale development, north-central Arkansas",
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"abstract": "Exploration of unconventional natural gas reservoirs such as impermeable shale basins through the use of horizontal drilling and hydraulic fracturing has changed the energy landscape in the USA providing a vast new energy source. The accelerated production of natural gas has triggered a debate concerning the safety and possible environmental impacts of these operations. This study investigates one of the critical aspects of the environmental effects; the possible degradation of water quality in shallow aquifers overlying producing shale formations. The geochemistry of domestic groundwater wells was investigated in aquifers overlying the Fayetteville Shale in north-central Arkansas, where approximately 4000 wells have been drilled since 2004 to extract unconventional natural gas. Monitoring was performed on 127 drinking water wells and the geochemistry of major ions, trace metals, CH4\u00a0gas content and its C isotopes (\u03b413CCH4), and select isotope tracers (\u03b411B,\u00a087Sr/86Sr, \u03b42H, \u03b418O, \u03b413CDIC) compared to the composition of flowback-water samples directly from Fayetteville Shale gas wells. Dissolved CH4\u00a0was detected in 63% of the drinking-water wells (32 of 51 samples), but only six wells exceeded concentrations of 0.5\u00a0mg CH4/L. The \u03b413CCH4\u00a0of dissolved CH4\u00a0ranged from \u221242.3\u2030 to \u221274.7\u2030, with the most negative values characteristic of a biogenic source also associated with the highest observed CH4\u00a0concentrations, with a possible minor contribution of trace amounts of thermogenic CH4. The majority of these values are distinct from the reported thermogenic composition of the Fayetteville Shale gas (\u03b413CCH4\u00a0=\u00a0\u221235.4\u2030 to \u221241.9\u2030). Based on major element chemistry, four shallow groundwater types were identified: (1) low (<100\u00a0mg/L) total dissolved solids (TDS), (2) TDS\u00a0>\u00a0100\u00a0mg/L and Ca\u2013HCO3\u00a0dominated, (3) TDS\u00a0>\u00a0100\u00a0mg/L and Na\u2013HCO3dominated, and (4) slightly saline groundwater with TDS\u00a0>\u00a0100\u00a0mg/L and Cl\u00a0>\u00a020\u00a0mg/L with elevated Br/Cl ratios (>0.001). The Sr (87Sr/86Sr\u00a0=\u00a00.7097\u20130.7166), C (\u03b413CDIC\u00a0=\u00a0\u221221.3\u2030 to \u22124.7\u2030), and B (\u03b411B\u00a0=\u00a03.9\u201332.9\u2030) isotopes clearly reflect water\u2013rock interactions within the aquifer rocks, while the stable O and H isotopic composition mimics the local meteoric water composition. Overall, there was a geochemical gradient from low-mineralized recharge water to more evolved Ca\u2013HCO3, and higher-mineralized Na\u2013HCO3\u00a0composition generated by a combination of carbonate dissolution, silicate weathering, and reverse base-exchange reactions. The chemical and isotopic compositions of the bulk shallow groundwater samples were distinct from the Na\u2013Cl type Fayetteville flowback/produced waters (TDS \u223c10,000\u201320,000\u00a0mg/L). Yet, the high Br/Cl variations in a small subset of saline shallow groundwater suggest that they were derived from dilution of saline water similar to the brine in the Fayetteville Shale. Nonetheless, no spatial relationship was found between CH4\u00a0and salinity occurrences in shallow drinking water wells with proximity to shale-gas drilling sites. The integration of multiple geochemical and isotopic proxies shows no direct evidence of contamination in shallow drinking-water aquifers associated with natural gas extraction from the Fayetteville Shale.",
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