PGS MegaSurveys: Enhanced Regional Imaging of Hydrocarbon Provinces

Edwards, Huw; Davidson, K.; Loader, Chris; Westlake, Shane; Maingarm, Suvimol

doi:10.1190/segj082006-001.116

Cited by 1 publication

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“…Seismic interpretation is based on the analysis of a seismic volume of ca. 11,000 km 2 extracted from the much broader PGS Carnarvon MegaSurvey (Edwards et al, 2006), and on the re-interpretation of the regional 2D seismic line s136-05, previously described in McCaffrey et al (2020) and Young et al (2001). The seismic volume has a spatial resolution of 50 × 50 m, and a vertical sampling rate of 4 ms. Seismic interpretation was performed in PaleoScan™ software, in two-way time (TWT), and hundreds of seismic horizons representing chronostratigraphic surfaces were generated following the workflow from Paumard et al (2019a).…”

Section: Methodsmentioning

confidence: 99%

Differentiating reefal ridges from relict coastal ridges: Lessons from the seismic geomorphologic study of buried Miocene buildups (North West Shelf, Australia)

et al. 2023

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Linear buildups formed in tropical carbonate environments are often interpreted as bioconstructed reefs. Nevertheless, coastal processes can also form extensive sedimentary ridges exhibiting buildup morphologies. This study investigates two Miocene ridges developed along the Australian North West Shelf using 3D seismic and well data. Ridge 1 is ca. 30 m thick and >60 km long, and it is made of foraminiferal pack‐grainstones. It protects a lagoon with pinnacle morphologies. Ridge 2 is ca. 150 m thick and >80 km long. It is composed of quartz sand forming lobes. Both ridges have a continuous curvilinear front and are in a mid‐shelf setting. They mimic the modern Australian coastline. It is then proposed that Ridge 1 is either: (1) a barrier reef developed on a drowned shoreline, or (2) stacked carbonate aeolianites and beachrocks acting as a barrier. Ridge 2 is interpreted as stacked deltaic sands. This study demonstrates that lithified and buried coastal features of carbonate and siliciclastic nature can form extensive ridges exhibiting buildup morphologies. It is proposed that ridges formed by stacked coastal features are overall continuous with a curvilinear front, while reefal ridges are more discontinuous and exhibit deeper and more stable passes.

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Section: Methodsmentioning

confidence: 99%