oa Seismic Imaging beneath the Eucla Basin Limestones

Geoscience Australia in collaboration with the Geological Survey of Western Australia conducted a seismic testing program on the Eucla Basin carbonate sediments during May 2012. These data were collected as part of the Albany-Fraser Orogen Seismic Survey that consists of four lines in south-east Western Australia with a total length of 671 km. The major aim of this survey was to image the basement relationship between the Yilgarn craton, the Albany-Fraser zone, and basement rocks further east. Much of this eastern area is covered by the limestones of the Eucla Basin, and there has been little seismic data acquired in this area prior to the survey commencing. Tests were designed to optimise the acquisition parameters for collecting deep seismic data beneath the limestones through the region.

Several sets of recording parameters were tested, including 10 Hz geophones compared to lower frequency 4.5 Hz geophones as parallel spreads, and linear versus non-linear logarithmic sweeps.