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Structural Uncertainty Due to Fault Timing: A Multimodel Case Study from the Perth Basin
Kerry Bardot, Martin Lesueur1,2, Adam J Siade1,3
1School of Earth Sciences, University of Western Australia, Perth, Australia.
Ground Water
|June 20, 2024
Summary
Fault timing significantly impacts groundwater flow, more than conductivity. Understanding fault behavior is crucial for accurate groundwater modeling and management.
Area of Science:
- Hydrogeology
- Geological Modeling
- Geophysical Fluid Dynamics
Background:
- Faults are critical in groundwater studies, influencing flow and creating uncertainty.
- Research often overlooks fault timing and vertical termination, assuming recent, instantaneous faulting.
- Existing models may oversimplify fault behavior, impacting hydrological predictions.
Purpose of the Study:
- To investigate the impact of fault timing on groundwater flow regimes.
- To compare the influence of fault timing versus conductivity on groundwater flow.
- To assess the implications of fault behavior on aquitard integrity and contaminant transport.
Main Methods:
- Developed three geological interpretations for a Perth Basin transect with unknown fault timing.
- Utilized flow modeling to simulate groundwater patterns under different faulting scenarios.
- Performed multiple realizations with stochastic parameter sets for layers and fault zones.
Main Results:
- Recent faulting models showed distinct flow patterns due to aquifer juxtaposition.
- Fault timing had a greater influence on groundwater flow than layer or fault zone conductivity.
- Fault conduit behavior breaching aquitards significantly impacts transport; barrier behavior has minimal effect.
Conclusions:
- Fault timing is a critical factor in groundwater flow and transport modeling.
- Multiple geological models are essential for addressing structural uncertainty in faulted systems.
- Further data collection is recommended to understand fault impacts on aquitards and groundwater systems.
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