On the applicability of Persistent Scatterers Interferometry (PSI) analysis for long term CO2 storage monitoring

Abstract

To cite this version:Jérémy Rohmer, Daniel Raucoules. On the applicability of Persistent Scatterers interferometry (PSI) analysis for long term CO2 storage monitoring. Engineering Geology, Elsevier, 2012, 147-148, pp.137-148 injection into deep aquifers (of the order of 25 to 50 years). 10This technique was successfully utilized at the CO 2 storage site of In-Salah (Algeria). 11Nevertheless, this success may not be generalized to future onshore industrial-scale CO 2 12 storage sites, which are planned in far more complex contexts mostly presenting natural 13 terrains, either agricultural or vegetated areas, i.e. characterized by poor PS density, which 14 might locally drop to zero, hence hampering the deployment of the PSI technique. The 15 objective of the present paper is to discuss the constraints on the PSI application regarding the 16 specificities (magnitude, spatial or temporal scales and evolution) of the deformation 17 phenomenon associated with the CO 2 injection into storage aquifers. This discussion is 18 supported by the estimates of the expected spatio-temporal evolution of surface vertical 19 displacements caused by CO 2 injection in deep aquifers by combining the approximate 20 solutions for pressure build-up and for the associated vertical displacements in an elastic half-

Potential of diffuse scatterer interferometry for monitoring CO2 storage sites in European contexts (land cover types)

“…ground subsidence or uplift) must be detected and monitored for the entire activity period of the injection site (up to 50 years) and over a surface about 10-20 km in diameter. As shown in Rohmer and Raucoules (2012), the expected vertical displacements to be measured can be as small as a few tenths of one mm year −1 . Therefore, the precision needed to characterize the deformation to be monitored requires processing of a large amount of SAR data by means of PSI or interferogram stacking techniques.…”

Sizing a geodetic network for risk-oriented monitoring of surface deformations induced by CO 2 injection: Experience feedback with InSAR data collected at In-Salah, Algeria

“…For lower deformations (L-band interferometry is less sensitive than C or X-band to millimetric and sub-millimetric/year motions) and highly vegetated areas, the interpretation of the interferometric results might be compromised (e.g. Rohmer and Raucoules, 2012;Raucoules et al, 2015). Indeed, the technique lies on the fact that the ground surface is regularly imaged; through comparison of two subsequent images, it is then possible to deduce deformations.…”

“…a sector in the Paris basin of 3455 km 2 (cf. Rohmer and Raucoules, 2012 for precise location) or in Lorraine (Raucoules et al, 2015), where the potential implementation of CO 2 storage sites has been investigated, characterized by a land use composed of less than 5% of artificial or urban land cover and more than 95% of natural (mainly forests) and agricultural areas (Rohmer and Raucoules, 2012). In such vegetated terrains, the absence of stable man-made structures or rocky surfaces might lead to sparse PS network (with PS density to less than 1 PS/km 2 ).…”

“…In the following, the term "measurement point" (MP) is used to designate both existing measurement points as well as installed devices. As mentioned in Rohmer and Raucoules (2012), the InSAR technique should be applicable even for distant CR since the expected total deformation corresponds to less than one C-band sensor fringe (equivalent to ∼3 cm of vertical displacement). In this case, InSAR phase unwrapping difficulties could be neglected.…”

Remote sensing of CO2 leakage from geologic sequestration projects

“…The principle behind such detection is that as CO 2 is injected to the subsurface at a constant rate, the ground will displace and swell in a consistent fashion (Benson and Cook, 2005;Benson and Myer, 2002). In the event of a leak to the system, this swelling of the surface might change to occur at a different rate, or even become a reversal from ground swelling to deflation (Rohmer and Raucoules, 2012).…”