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Zeewulf condensate discovery

Structure: Zeewulf, condensate recovered on RFT, non-commercial
Location: Carnarvon Basin
Pull-up: Minor
Top of HRDZ: 1650–1700 ms
Amplitude Anomalies: Moderate
Intensity: Low
Data Degradation: Very low
Distribution: Many small anomalies related to faulting

The seismic line passing through the Zeewulf–1 well in the Carnarvon Basin shows good quality seismic imaging (Fig. 19). The use of appropriate, deep water, deconvolution filters contributed to the quality of the shallow data. Duncan (1998) has described deepwater processing sequences tested in this region, and the importance of selecting the right deconvolution operators.

The observed shallow amplitude anomalies, with underlying time pull-up, are probably small HRDZs associated with minor faulting. The Zeewulf–1 well recovered condensate in a repeat formation test (RFT), but did not contain commercial volumes of hydrocarbons, perhaps because of fault leakage. The shallow location of the HRDZs supports a late leakage model.

Figure 19. Evidence of shallow HRDZs on the Zeewulf structure.