Santos Gladstone Analytical Regional groundwater model Model not calibrated Limited deterministic uncertainty analysis: LNG Project, model (Roma Model domain limited to project Dual-phase flow, coal dual porosity and anisotropy, and Sensitivity analysis (four cases) for Australia (Santos, field), area Geomechanical effects not included specific aquifer parameters and recharge 2009) MODFLOW for the MODFLOW model, and for Time-varying constant head Coal seams not modelled independently of coal measures storativity for the analytical model (Comet boundary condition used to Vertical movement of groundwater not well constrained Ridge field) represent well field (rather than Coal seam gas well fields were modelled Aquifer confinement and interconnection simplified pumping/flow rates) for separately and cumulative impacts Effects of geological faults assumed insignificant MODFLOW model; associated with other developments Analytical modelling did not account for size of well assessed on a qualitative basis constant pumping rate used to Apparently no accounting of groundwater–surface water represent well field in analytical interaction model Surat Basin (QGC, MODFLOW Regional groundwater model Dual-phase flow, coal dual porosity and anisotropy, and None – 2009) coal seam gas region divided into geomechanical effects not included three subdomains (hydraulic Coal seams not modelled independently of coal measures compartmentalisation assumed) No consideration of rainfall recharge Time-varying constant head Simplified geology, homogeneous isotropic conditions boundary condition used to Cumulative impacts not assessed represent well field (rather than Apparently no accounting of groundwater–surface water pumping/flow rates) interaction Queensland MODFLOW Regional groundwater model Modelling of historical coal seam gas operation, included Uncertainty analysis was carried out Resources (CWC, (300,000 km2 model domain) simulation of multiple coal seam gas operations, was used to multiple simulations incorporating 2012) develop and assess cumulative impacts and aggregate changes to the model. The results of this groundwater extraction associated with coal seam gas analysis were used to assess uncertainty extraction in the predicted impacts
Santos Gladstone LNG Project, Australia (Santos, 2009) Analytical model (Roma field), MODFLOW (Comet Ridge field) Regional groundwater model Model domain limited to project area Time-varying constant head boundary condition used to represent well field (rather than pumping/flow rates) for MODFLOW model; constant pumping rate used to represent well field in analytical model Model not calibrated Dual-phase flow, coal dual porosity and anisotropy, and Geomechanical effects not included Coal seams not modelled independently of coal measures Vertical movement of groundwater not well constrained Aquifer confinement and interconnection simplified Effects of geological faults assumed insignificant Analytical modelling did not account for size of well Apparently no accounting of groundwater–surface water interaction Limited deterministic uncertainty analysis: Sensitivity analysis (four cases) for specific aquifer parameters and recharge for the MODFLOW model, and for storativity for the analytical model Coal seam gas well fields were modelled separately and cumulative impacts associated with other developments assessed on a qualitative basis Surat Basin (QGC, 2009) MODFLOW Regional groundwater model – coal seam gas region divided into three subdomains (hydraulic compartmentalisation assumed) Time-varying constant head boundary condition used to represent well field (rather than pumping/flow rates) Dual-phase flow, coal dual porosity and anisotropy, and geomechanical effects not included Coal seams not modelled independently of coal measures No consideration of rainfall recharge Simplified geology, homogeneous isotropic conditions Cumulative impacts not assessed Apparently no accounting of groundwater–surface water interaction None Queensland Resources (CWC, 2012) MODFLOW Regional groundwater model (300,000 km2 model domain) Modelling of historical coal seam gas operation, included simulation of multiple coal seam gas operations, was used to develop and assess cumulative impacts and aggregate groundwater extraction associated with coal seam gas extraction Uncertainty analysis was carried out multiple simulations incorporating changes to the model. The results of this analysis were used to assess uncertainty in the predicted impacts