How to Establish CO2 Flow/Concentration Warning Levels Based on the Geochemical Monitoring Baseline: Specific Case of CO2 Storage at Claye-souilly (Paris Basin)

Abstract

An appropriate monitoring program proving CO 2 can be stored safely for a long time is a key factor in controlling long term storage efficiency of CCS projects. A site in the Paris basin near Claye-Souilly area was identified for a future CCS pilot project. Baseline acquisition is deeply complex due to the presence of multi CO 2 sources (biogas, vehicles, industrial operations, natural sources). Campaigns of measurement have demonstrated the feasibility of such strategy to detect gas transfers from subsurface equipment. Survey of CO 2 storage is greatly affected by site activity and requires the development of efficient sensors in deep boreholes.

The Importance of Baseline Surveys of Near-Surface Gas Geochemistry for CCS Monitoring, as Shown from Onshore Case Studies in Northern and Southern Europe

“…One of the challenges of the precise application of this technique is the need to separate a leakage signal from shallow, biogenic CO 2 background values or anomalies, which can vary as a function of water content, temperature, soil type, topography, etc (as reviewed in Beaubien et al, 2013). Baseline surveys, which measure the natural background concentration and flux values at a proposed CCS site prior to injection, have been proposed to help interpret monitoring results by defining the natural spatial and temporal variability of a site and the range of values that can typically be associated with local near-surface processes (Elı´o et al, 2013;Lescanne et al, 2011;Pironon et al, 2013).…”