Anomalous pore pressures in Mississippi delta sediments: Gas and electrochemical effects

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Abstract
Observed differences between the pore pressures in gassy Mississippi Delta sediments, indicated by transducers equipped with coarse filters and those equipped with fine filters, are demonstrated unlikely to be due to one transducer responding to the pore water pressure and the other to the pore gas pressure. Laboratory experiments suggest that part of the observed differences in indicated pore pressure may be due to electrochemical effects, either electroosmosis or electrolytic hydrogen generation.