Abstract
Seismic refraction recordings along a line extending from Mt Howitt No. 1 well to Eromanga in southwest Queensland, over the Eromanga and Cooper basin sediments, revealed two intra-basement refractors not recorded by coincident reflection profiling. These refractors were recorded at 3.5 km and 5.0 km depth between the basin/basement unconformity at 2.4 km depth and a low velocity zone at about 8.0 km depth. Precise modelling of the refracted first-arrival times showed that the basin structure and faults seen on the reflection profile extended into basement to at least 5.5 km depth, with increasing displacement on the faults with depth, causing lateral variation of structure and velocity. A feature of the seismic refraction data in this region is a series of up to five multiples which can be observed from 10 km to at least 40 km distance. Travel-time characteristics indicate that these multiples are waves refracted within basement and multiply reflected at the surface. Travel-time modelling of the refracted first-arrivals, multiples and two-way reflection times provides a tight constraint on velocity and structure to a depth of about 5.5 km.
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