Lessons Learned from Practical Application of Geochemical Monitoring Methodology to CO2 Storage Site: Specific Case of Claye-Souilly project, Paris Basin, France

Abstract

This paper presents the lessons learned from practical application of CO 2 storage site monitoring methodology developed to address geochemical aspects of future CO 2 storage site. It covers a detailed description of the methodology and tools applied for the extremely complex industrial site that main technical challenge is the presence of the multi sources of CO 2 at the surface and in the soil.On the basis of previous research programs conducted on natural CO 2 storage sites, a specific geochemical monitoring program was developed that combine both a localized and continuous geochemical monitoring.The paper focuses on the surface gases monitoring techniques spread on specific site to quantify CO 2 flux and concentration at different levels from soil-atmosphere-interface : -1m to +1m. The geochemical monitoring was based on the combined use of conventional accumulation chambers and dynamic flow chambers systems equipped with high resolution IR sensors, Fourier Transform infrared sensors equipped with specific gas cell and a CO 2 mobile infrared sensor. This first step has lead to the location and discrimination of CO 2 sources and the analysis of the carbon cycle involving the influence of anthropogenic events and of the natural seasonal variations. Combined methodology matrix for a geochemical surface survey adapted to CO 2 storage in Paris basin depth saline aquifer is argued and the measurement results are discussed. 13 C isotopic analyses to insure gas traceability have been also applied. Results are not shown in the paper. On the basis of such combined surface and subsurface gas measurements, seasonal variations of the natural CO 2 cycle were identified. As results, sensitivity and variability were considered to suggest the CO 2 warning levels adapted to detect CO 2 abnormal emissions on the surface.Finally, advanced complementary technologies for both soil and atmospheric gas investigations are also detailled as a part of the survey strategy. For soil gases, a specific completion in a shallow well has been developped to perform the continuous acquisition of CO 2 concentrations at a depth of 10 m. For atmospheric gases, a scanning imaging infrared remote sensing system was tested to support atmospheric dynamic survey strategy.This site study applied to Claye Souilly waste disposal represents the real "hand on" experience and could be considered as a valuable experience to improve part of the geochemical monitoring program of CO 2 storage site.

In situ continuous monitoring of dissolved gases (N2, O2, CO2, H2) prior to H2 injection in an aquifer (Catenoy, France) by on-site Raman and infrared spectroscopies: instrumental assessment and geochemical baseline establishment

“…[46][47][48][49][50][51] The successive developments have aimed to optimize all measurement systems, to simplify experimental protocols, and to establish gas calibration curves for accurate prediction and simulation of gas dissolution, diffusion and transfer in the surrounding geological medias. [52][53][54][55][56][57][58][59][60][61] The most commonly adopted analytical setups for the purpose of in situ, long-term and continuous gas monitoring comprise three modules: specic completion, gas circulation tubing and sensor(s) compartment, installed in a dedicated borehole from the shallow surface down to À600 m deep. 32,50,53,56,57,60,62 Raman and infrared spectrometers have proven to be suitable sensors: these techniques have been constantly developed from the laboratory measurement scale to the continuous eld measurement scale for soil and underground gas monitoring.…”

“…[52][53][54][55][56][57][58][59][60][61] The most commonly adopted analytical setups for the purpose of in situ, long-term and continuous gas monitoring comprise three modules: specic completion, gas circulation tubing and sensor(s) compartment, installed in a dedicated borehole from the shallow surface down to À600 m deep. 32,50,53,56,57,60,62 Raman and infrared spectrometers have proven to be suitable sensors: these techniques have been constantly developed from the laboratory measurement scale to the continuous eld measurement scale for soil and underground gas monitoring. 32,50,60 The two techniques are complementary (at similar cost) as Raman spectroscopy can detect a lot of gases (e.g.…”