Improving Persistent Scatterers Interferometry (PSI) analysis in highly vegetal / agricultural areas for long term CO2 storage monitoring (original) (raw)

Energy Procedia, 2014

Abstract

ABSTRACT In the present study, we applied two strategies for improving the use of InSAR/PSI techniques for long-term monitoring ground surface deformation induced by CO2 injection areas presenting a large cover of vegetation (agricultural fields, forests, etc.). The first approach relies on advanced processing techniques using the Diffuse-Scatterers-like (DS) technique. Our test case is a potential French test site presenting a vegetated cover not very adapted for the application of InSAR techniques. Though our algorithm remains under development, its application to the test-case revealed the limitations of DS-like techniques in areas presenting extended forest cover (i.e. of very low coherence). A second strategy relies on the optimization of the number and positions of Corner Reflectors (CR) regarding risk-oriented monitoring objectives: regional-scale surveillance, local anomaly (e.g. abandoned well) with known or unknown spatial locations. Using the deformation rate at KB-501 well at In-Salah as a reference solution, we showed that a network of moderate number of CR (density of 0.5 CR/km2) was sufficient to reveal the deformation information for both the regional-scale surveillance and the local anomaly with known location. Yet, detecting an anomaly with unknown location remains very difficult unless installing a very dense CR network (100 CR over an area defined by a radius of 4 km).

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