On baseline determination and gas saturation derivation from downhole electrical monitoring of shallow biogenic gas production

Abstract : Adequate hydrogeophysical monitoring of CO2 geological storage remains a challenge as different parameters might be modified during storage. That implies to compare real-time measurements to an adequate baseline. At the Maguelone shallow experimental site a representative baseline for electrical resistivity was built from a large number of downhole geophysical measurements. At this coastal site this issue is particularly important due to the production of biogenic gas from the subsurface sediments. For this, a modified petrophysical model based on the Waxman-Smits model is proposed to estimate gas saturation found to vary from 2 to 7% within shallow sand layers.
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Philippe Pezard, Halidi Abdoulghafour, Nataliya Denchik, Herve Perroud, Johanna Lofi, et al.. On baseline determination and gas saturation derivation from downhole electrical monitoring of shallow biogenic gas production. Energy Procedia, Elsevier, 2015, 76, pp.555-564. ⟨10.1016/j.egypro.2015.07.910⟩. ⟨hal-01412685⟩

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