The major gap describing groundwater processes in the Gloucester subregion is the lack of knowledge of geological structures, particularly faults, including (i) their nature as carriers or barriers to flow, (ii) their location spatially and (iii) their extent vertically throughout the coal seam and shallower layers. Within the Assessment efforts have been made to understand the faulting and layering of the subregion using existing deep well and geophysical datasets. This work is summarised in Section 2.1.3 of companion product 2.1-2.2 for the Gloucester subregion (Frery et al., 2018).

The major faults and sub-seismic fault distribution estimates are used in numerical modelling of the deep strata with 10,000 random realisations of faults. The results are described in companion product 2.6.2 for the Gloucester subregion (Peeters et al., 2018). That work was done in a probabilistic manner and showed that at the regional scale there was a low chance of propagation of drawdown from mining and CSG operations (random well locations). No modelling was performed for specific locations with known or proposed wells for local effects only.

Last updated:
23 October 2018