Abstract
SUMMARY An accurate seismic velocity model is essential for depth conversion and rock property determination in the context of fluid flow modelling for secure storage of carbon dioxide in the study area. Three types of seismic velocity measurements are available within the study area: velocities derived from stacking of multi-channel reflection seismic data; velocities determined in the process of ray tracing modelling of large offset refraction data acquired by ocean bottom seismographs (OBSs) along the coincident reflection/refraction transect, and velocities from well log measurements. Generally, the OBS derived velocities are faster than the stacking derived velocities in the shallow section down to 2 km depth, with particularly large (exceeding 15 %) discrepancies in the NE part of the study area. High velocities in the OBS model are consistent with well log measurements in the Newby 1 and Flat Top 1 exploration wells. Integration of OBS refraction velocities with stacking velocities through the calibration of both of them against well logs is the best way to construct a reliable velocity model for the whole section. Refraction seismic data coverage offshore Australia is expected to significantly improve as in 2013 Australia will obtain a National Pool of OBSs suitable for multi-scale experiments.
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