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Figure 4.2. Location of core samples examined in the greater Wunger Ridge area. See also Figure 2.1c for
location relative to the Bowen Basin.
4.2. Geophysical data
Datasets available for the seismic interpretation are listed below.
• Reflection seismic data were available in printed format, mostly as final stacks with
occasional migrated stacks. The seismic data used was normal polarity (Australian standard,
reverse USA) producing a peak (right hand deflection) as the seismic wave moves from high
to low velocity material (e.g. sandstone/shale to coal). The data was provided by the
QDNRME in Brisbane as TIFF images. No data in the area were available in SEGY format
at the time of request. The data are generally poor-to-average in areas of high density
faulting and the resolution is low as all data used was recorded between 1979 and 1992.
Modern seismic surveys have a shorter shotpoint interval and hence show increased
resolution.
• A seismic line location file was provided by the QDNRME in ASCII format and was loaded
into the Petrosys TM mapping software as Australian Geodetic Datum 1966 (AGD66), later
converted to Geocentric Datum of Australia 1994 (GDA94).
• Synthetic seismograms were available for about 10 % of the wells used. The time needed to
make other synthetic seismograms was thought unwarranted in view of the objectives and
the overall time constraints on the project.
• Time-depth data from well completion reports were available for a large percentage of the
wells in various forms and at various levels of accuracy (e.g. time-depth plots and tables)
• Potential field (TIFF) images were available but were considered to have insufficient
resolution. Details for individual lines and surveys can be found in Appendix 10.6.6.
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