Bremer Sub-basin Seismic Survey Data for Crustal and Hydrocarbon Analysis

2700 km of industry-standard seismic data were acquired in late 2004 as part of Geoscience Australia's Southwest Frontiers Survey. The refraction study revealed basement velocities of 5.2-5.6 km/s, indicating a non-granitic composition, and identified sediment thickness exceeding 9 km in the Bremer Sub-basin. Results were correlated with findings from the 50th Russian Antarctic Expedition, suggesting a ~400km wide low-velocity zone in the pre-breakup Gondwana crust.

Use Cases

• Modeling tectonic evolution based on estimates of crustal thickness underneath sediment deposition centers.
• Improving depth conversion of reflection seismic data based on accurate seismic velocity information.
• Constraining hydrocarbon maturation scenarios based on the low heat production of metasediment basement.
• Analyzing basement composition and structure based on refraction seismic velocity ranges.

Strengths

• Includes 2700 km of 106-fold seismic data recorded to 12 seconds two-way time.
• Refraction data supplemented old coverage, providing velocity information down to 3 seconds two-way time.
• Findings are correlated with conjugate Antarctic data from a Russian expedition, supporting broader tectonic interpretations.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-06-04 06:20:37.709778; freshness should be verified.

Provenance

Source

Geoscience Australia, Australian Ocean Data Network

Collection Method

Marine reflection and refraction seismic survey using a digital streamer, gun array, and sonobuoys.

Time Range

Survey conducted in late 2004; Antarctic counterpart data from December 2004 - April 2005.

Freshness

Data from 2004 survey; metadata last updated 2026-06-04.

Geography

South-western Australian continental margin (Bremer Sub-basin) and its Antarctic conjugate counterpart.