[ Up ] [ Introduction ] [ Seismic Expressions ] [ Results ] [ Bayu-Undan ] [ Tahbilk ] [ Skua ] [ Jabiru ] [ Cornea ] [ Anomaly1 ] [ Anomaly2 ] [ Anomaly3 ] [ North Rankin ] [ Enfield ] [ Macedon ] [ Chinook ] [ Carnarvon ] [ Novara NW ] [ Zeewulf ] [ Jupiter ] [ Scarborough ] [ Otway ] [ Kingfish ] [ Exploration ] [ Skua Detail ] [ Macedon Detail ] [ Implications ] [ Summary ] [ Acknowledgements ] [ References ] [ Authors ] [ Update ]
North
Rankin gas field, Carnarvon Basin
Field:
North Rankin Gas Field
Location: North West Shelf
Top of HRDZ: 850 ms
Pull-up: Moderate
Intensity: Weak
Amplitude Anomalies: Moderate
The
amplitude anomalies between 800 and 900 ms near, and to the northwest of, the
North Rankin wells in the Carnarvon Basin may represent low intensity HRDZs
(Fig. 12). The seismic travel-time pull-up beneath the anomalies shows that they
consist of high velocity material, though the anomalies are not of sufficient
intensity to cause attendant degradation of the stack response.
The
low intensity of the zones suggests that leakage has been minor and that the
field has high top and fault seal integrity. Different initial gas-water
contacts encountered within individual reservoir units within the field may have
been caused by a combination of compartmentalisation and localised leakage. The
anomaly to the north west of North Rankin–6 may be caused by leakage from the
Perseus Field, which is trapped stratigraphically.
Figure 12. Possible HRDZs over
the North Rankin Gas Field, Dampier Sub-basin, Carnarvon Basin.
The APPEA Journal 2000. © This collection APPEA Limited
2000. Authors retain © in respect of their own contribution.
