Jupiter

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Jupiter gas discovery

Structure: Jupiter gas discovery
Location: Carnarvon Basin
Pull-up: Minor
Top of HRDZ: 150–200 ms
Amplitude Anomalies: Moderate

The Jupiter gas accumulation is located in the deep water Exmouth Basin, Western Australia. The crest of the fault-bounded structure lies near shot-point 1410 at 2,100 ms TWT (Fig. 20). A highly seismically reflective layer is situated about 150 to 200 ms below the sea floor above the Jupiter fault. This amplitude anomaly is probably caused by gas leakage up the fault and into a shallow formation. Increased reflectivity is probably caused either by the gas itself, or by carbonate cementation caused by the gas. The presence of gas in a formation will reduce the acoustic impedance, whereas carbonate cement causes an increase. In this example, the amplitude anomaly appears to be caused by a positive impedance contrast (the same as the sea floor), thereby favouring the carbonate cementation model.

Figure 20. The Jupiter–1 gas accumulation showing a shallow amplitude anomaly.