Geochemical Analysis of Four Australian Petroleum Source Rocks

A study compares the geochemical characteristics of four Australian petroleum systems, ranging from the Ordovician to Early Cretaceous periods. The analysis focuses on source rocks deposited in marine environments with varying contributions of terrestrial organic matter, using petrological, palynological, and molecular evidence.

Use Cases

• Analyze terrestrial organic matter contributions using biomarker data like hopane and sterane distributions from Ordovician to Cretaceous source rocks.
• Model petroleum system generation potential by correlating source rock composition, indicated by terrestrial versus marine organic matter, with hydrocarbon fluid maturity.
• Investigate paleoenvironmental conditions, such as photic zone euxinic (PZE) environments, using molecular evidence like perylene and methyltrimethyltridecylchroman abundances.
• Assess the preservation and detection of terrestrial geochemical signals in generated hydrocarbon accumulations across different geological periods.

Strengths

• Analysis spans four distinct Australian petroleum systems covering a significant geological time range from the Ordovician to the Early Cretaceous.
• Incorporates multiple lines of evidence including petrological, palynological, and molecular geochemical data for cross-validation.
• Focuses on a classic and topical problem in marine biogeochemistry with direct implications for petroleum systems analysis.

Limitations

• Primary data and specific sample measurements are not provided in a structured, machine-readable format; the source is a PDF document.
• The study's conclusions note that terrestrial geochemical signatures are not always obvious in generated hydrocarbon accumulations, indicating potential detection limitations.
• Geographic coverage is limited to specific Australian basins (Canning Basin, North West Shelf).

Provenance

Source

Geoscience Australia Data

Collection Method

Comparative geochemical study of source rock samples using classical biomarker analysis and other molecular compounds.

Time Range

Ordovician to Early Cretaceous periods.

Freshness

Last updated March 2026.

Geography

Australian basins, including the Canning Basin in Western Australia and the North West Shelf.