Mid-Tertiary Permeability Barriers in the Murray Basin Subsurface, Australia

A geological study from Geoscience Australia analyzing subsurface permeability barriers in the Murray Basin. The description details stratigraphic units like the Ettrick Formation, Winnambool Formation, and Geera Clay, which influence groundwater flow. It includes specific porosity measurements from a cored borehole section.

Use Cases

• Modeling groundwater flow paths based on described subsurface permeability barriers.
• Stratigraphic correlation and mapping using the described mid-Tertiary geological units.
• Assessing aquifer connectivity and confinement based on the geometry of low-permeability layers.
• Estimating historical porosity and permeability changes from the provided core sample analysis.

Strengths

• Includes specific porosity measurements (0-7% effective, 5-10% original) from a cored borehole section.
• Describes detailed stratigraphy and geometry of multiple geological formations (e.g., Ettrick Formation, Geera Clay).
• Provides a temporal framework for marine incursions, including a 20-million-year event starting about 32 Ma ago.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data is presented in PDF/HTML formats, which may require extraction for computational analysis.

Provenance

Source

Geoscience Australia Data

Collection Method

Subsurface facies analysis of borelogs and palaeogeographic reconstructions, as described.

Time Range

Mid-Tertiary (Oligocene to Miocene), with specific references to events from about 32 million years ago.

Freshness

Last updated 2026-04-20 02:32:46.550418; freshness should be verified.

Geography

Subsurface of the Murray Basin, southeastern Australia.