Project Summary

This research project aims to improve knowledge of the nature of the Yalgorup Member and test their reactivity and transmissivity to CO2-rich fluids, via a comprehensive multi-scale and multi-physics analysis, evaluating the petrographic, petrophysical and mechanical properties of the palaeosols and interbedded sand sequence, before and after sample ageing. The results will constrain a conceptual model to study the hydrodynamic and geochemical feedback between the palaeosols and sand bodies. To directly assess the intrinsic sealing capacity of the Yalgorup Member, the research team will investigate the past and current existence of independent fluid compartments by estimating current and palaeo-formation water salinities in the sand beds. Finally, both facies-derived seismic attributes inversion and stochastic modelling calibrated using the multiscale petrophysical characterisation are designed to provide a facies and properties 3D geomodel of the Yalgorup Member to carry out initial connectivity assessment and investigate baffle distribution for ranking the Yalgorup Member to act as an effective multi-barrier system.

Available Reports

Core characterisation from the main facies in the Yalgorup Mbr

The Yalgorup, in the South Perth Basin, is a possible multi-barrier unit for mobile CO2. It is made up of sedimentary units of low permeability clay-rich beds, interpreted as floodplain over bank deposits such as swamps, paleosols or crevasse splay environments and high permeability interbedded fluvial sands. This report presents the results of petrography and laboratory-based measurements that characterise microstructural properties, and the porosity and permeability, on 10 Yalgorup Member samples in the South West Hub area of the Perth Basis. Among the main conclusions drawn by researchers is that swamp facies have the best potential for barriers, containing high abundance of kaolinite, low porosity and permeability, small pore throats, and low density of micro-cracks.

Project Name:
Assessment of multi-barrier systems for CO2 containment in the Yalgorup Member

Research Organisation:
CSIRO

Status:
In Progress

Reference:
7-1215-0262

Research Program: Carbon Transport + Storage
Demonstration: South West Hub, Southern Perth Basin
Research Focus: Geochemistry, Containment, Dynamic seal capacity

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