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Enfield oil and gas discovery, Carnarvon Basin

Location: Carnarvon Basin
Top of HRDZ: 1300 ms
Pull-up: Strong
Intensity: High
Amplitude Anomalies: Strong
Area: Small
Data Degradation: High

Two HRDZs were identified in WA-271-P, prior to the drilling of the Enfield–1 well by Woodside in 1999. Their significance was highlighted when the Enfield–1 well discovered hydrocarbons in a stratigraphic trap to the east of these anomalies. These HRDZs are small in extent but have high intensity.

The anomaly shown in Figure 13 is seen on only two closely spaced 2D lines—on a wider grid spacing, the anomaly would be missed altogether. The presence of this anomaly provides high confidence of hydrocarbon charge in this region.

Figure 13. An HRDZ lies to the west of the Enfield discovery in the Carnarvon Basin. Left panel is by courtesy of Schlumberger Geco-Prakla.

Field: West of the Enfield oil and gas discovery
Location: Carnarvon Basin
Top of HRDZ: 1450 ms
Pull-up: Moderate
Intensity: Moderate
Amplitude Anomalies: Strong
Area: Small
Data Degradation: Moderate

Figure 14. A second HRDZ to the west of the Enfield Discovery in the Carnarvon Basin.