Jurassic Sandstone Diagenesis and Porosity in the Eromanga Basin

Sandstone samples from the Jurassic and Lower Cretaceous periods in the Eromanga Basin of New South Wales are analyzed. The dataset compares quartzose and volcanolithic petrofacies, detailing diagenetic overprints, authigenic mineral sequences, and core porosity and permeability measurements. This geological study was published by the Australian Ocean Data Network and was last updated in April 2026.

Use Cases

• Classify sandstone petrofacies (quartzose vs. volcanolithic) based on described mineralogical and depositional environment characteristics.
• Model porosity-permeability relationships using the reported mean core porosity (29% and 35%) and permeability (676 md and 125 md) values for different sandstone types.
• Analyze the temporal sequence of authigenic minerals (e.g., glauconite, smectite, zeolite, quartz phases) to reconstruct diagenetic history.
• Correlate pore-type distribution (micropores, primary intergranular, secondary dissolution pores) with depositional environments and lithofacies.
• Investigate the impact of early diagenetic clay cutans and chlorite coatings on inhibiting quartz cementation and preserving primary porosity in quartzose sandstones.

Strengths

• Provides quantitative mean measurements for core porosity (29% and 35%) and permeability (676 md and 125 md) across two distinct sandstone petrofacies.
• Offers a detailed, process-oriented description of diagenetic sequences and authigenic mineralogy for both quartzose and volcanolithic sandstones.

Limitations

• The dataset scope is confined to a specific geological formation (Eromanga Basin in NSW), limiting broader geographical applicability.
• Sample size and exact row count for the physical measurements are not provided, making statistical robustness unclear.
• Data is presented in published document formats (HTML, PDF), which may require manual extraction for computational analysis.

Provenance

Source

Australian Ocean Data Network.

Collection Method

Analysis of geological samples and core measurements from the Eromanga Basin.

Time Range

Jurassic and Lower Cretaceous geological periods.

Freshness

Last updated in April 2026.

Geography

Eromanga Basin in New South Wales, Australia.