BELLMONT, Australia -- Spectrum and Australian Seismic Brokers (ASB) are currently reprocessing 15,800 km (9,817 mi) of 2D data from the North West Shelf of Australia (NWSR-09 project). The survey extends from the Exmouth Plateau to the Northern Browse basin and incorporates key well ties, according to the companies.
Preliminary results show significant improvements on the original data that could help petroleum geologists to better understand the effects of deep structures and basin architecture on the development of petroleum accumulations of the North West Shelf, the companies say.
The current data processing sequence is focused on accurate and detailed velocity analysis and preserving amplitudes for subsequent Amplitude Variation with Offset (AVO) information, as well as providing improved structural and stratigraphic imaging.
The survey was originally recorded in the 1980s and 1990s by the Australian Geological Survey Organisation (AGSO) as a regional crustal study. Because deep imaging was required, the seismic data was recorded to 16 seconds using a 5,000-m (16,404-ft) streamer.
The new dataset will be completed by September and will comprise pre-stack time migration (PSTM) stacks, gathers, angle stacks, velocities, and navigation data. The first reprocessed lines available will be those related to the upcoming acreage release by the Australian Government in the Exmouth and Southern Browse areas, to be announced at Australian Petroleum Production & Exploration Association (APPEA) Conference & Exhibition.