Seismic stratigraphic interpretation of megasequence and sequence framework in the Upper Cambrian through Devonian formations in the central part of the Darling Basin, western New South Wales, Australia

摘要

Upper Cambrian through Devonian formations in the central part of the Darling Basin, western New South Wales were investigated using seismic data, complemented by well and outcrop information. Detailed seismic stratigraphic interpretation of four main second-order seismic megasequence buildups in the central-northern Blantyre and southern Pondie Range sub-basins, shows that they are constructed of seventeen principal third-order seismic sequences. The four seismic megasequences are characterized as follows: Seismic megasequence A corresponds to the Upper Cambrian through Middle Ordovician strata and is equivalent to the Scropes Range Formation or Mutawintji Group, Seismic megasequence B corresponds to uppermost Silurian through Lower Devonian strata and is equivalent to the Winduck Interval, Seismic megasequence C corresponds to upper Lower Devonian through lower Middle Devonian strata and is equivalent to the Snake Cave Interval and Seismic megasequence D corresponds to upper Middle Devonian through Upper Devonian strata and is equivalent to the Ravendale Interval. Five regional seismic-stratigraphic boundaries have been identified in the three seismic sections to show the continuity of the Upper Cambrian through Devonian formations throughout the central-northern Blantyre and southern Pondie Range sub-basins. All seismic-stratigraphic boundaries are based on good continuous markers, with strong amplitudes throughout the whole sub-basins.