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Anomaly, Otway Basin

Location: Otway Basin
Pull-up: Moderate
Top of HRDZ: 300 ms
Amplitude Anomalies: Low
Intensity: Medium
Data Degradation: High

Seismic Line OP80-53A, from the Otway Basin in southeastern Australia, shows prominent gas chimneys extending from about 1,600 ms to the near surface (Fig. 22). Zones of pull-up within the chimneys suggest significant HRDZ formation. Degradation of the seismic data makes structural interpretation difficult within and below the chimneys.

Figure 22. Example of an HRDZ and gas chimneys in the Otway Basin, south-eastern Australia. Anomalies located ~20 km north-east of Bridgewater Bay–1 well. Example from Geary and Reid (1998). Seismic line provided courtesy of Geco-Prakla.