The effects of a gas well blow out on groundwater chemistry |
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Authors: | Walton Ross Kelly Gerald Matisoff J Berton Fisher |
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Institution: | (1) Department of Geological Sciences, Case Western Reserve University, 44106 Cleveland, Ohio;(2) Amoco Production Company, P O Box 591, 74102 Tulsa, Oklahoma;(3) Present address: U S Nuclear Regulatory Commission, Mail Stop 623 SS, 20555 Washington, DC |
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Abstract: | Water wells were sampled near North Madison, Ohio, following a gas well blow out that injected large amounts of CH4 into near-surface groundwater Chemical analyses showed elevated levels of Fe+2, Mn+2, Ca+2, sulfide, alkalinity, and pH, and low levels of dissolved oxygen, SO4
−2, and NO3
− in CH4-affected wells compared to unaffected wells. Sulfate reduction is quantitatively the most important vehicle for CH4 oxidation Equilibrium thermodynamic computer models were used to simulate groundwaters from the North Madison area Model
results showed that CH4 is oxidized to HCO3
−, SO4
−2 is reduced, iron and manganese oxides are reduced and dissolved, and pH increases These simulations are in excellent agreement
with trends observed in the field data A laboratory experiment was designed to simulate CH4
− perturbed groundwater in the methane-perturbed system, sulfide increased significantly, providing direct evidence for methane
oxidation by sulfate reduction
Although suitable anaerobic methane-oxidizing bacteria have not been isolated from groundwater aquifers, the combination of
field data, laboratory experiment, and computer simulation form a convincing argument that CH4 perturbation of aquifers can and does affect groundwater chemistry |
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