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On Baseline Determination and Gas Saturation Derivation from Downhole Electrical Monitoring of Shallow Biogenic Gas Production

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Authors
Pezard, P.
Abdoulghafour, Halidi
Denchik, N.
Perroud, H.
Lofi, J.
Brondolo, F.
Henry, G.
Neyens, D.
Date
2015
Type
Conference Paper

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Pezard, P. and Abdoulghafour, H. and Denchik, N. and Perroud, H. and Lofi, J. and Brondolo, F. and Henry, G. et al. 2015. On Baseline Determination and Gas Saturation Derivation from Downhole Electrical Monitoring of Shallow Biogenic Gas Production. Energy Procedia. 76: pp. 555-564.
Source Title
Energy Procedia
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Department of Petroleum Engineering
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Abstract

© 2015 The Authors. 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.