Gas Storage Monitoring

RTK analysis showing cross-correlation coefficient (R),
time-lag coefficient (T) and scale factor (K)

TRE has developed RTK analysis: an algorithm used to analyse the relationship between fluid extraction/injection volumes and the permeability of the subsurface.  Monitoring subtle changes on the  ground surface allows interpretation of three key subsurface parameters. 
These variables are:

• R - Cross-correlation map (similarity measurement) - high values highlight where, and if, ground displacement strongly resembles gas volumes stored in the reservoir.
• T -Time lag (propagation delay) – where R values are high it is possible to estimate a map showing the propagation delay (T) between injection/extraction rates and the ground deformation response.  Recent studies have shown that this map can be used successfully to obtain insights into reservoir permeability.
• K - Scale factor – where R values are not negligible, it is possible to identify the area affected by injection/extraction activities and, based on geo-mechanical models, estimate how the area will respond to higher injection/extraction rates.

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