MARINE HYDROCARBON CALIBRATION STUDY:
PETREL AND TERN FIELDS, CENTRAL BONAPARTE BASIN, AUSTRALIA
A 160 kilometer marine hydrocarbon study was completed over the Petrel and Tern Fields in the Central Bonaparte Basin, offshore Australia. This study was completed to provide a calibration data set over known reservoirs for comparison with regional data sets collected over lease Blocks WA-89-1, WA-89-2, and WA-89-3. Field operations were completed in June, 1989.
Results map a large, high magnitude, light hydrocarbon seepage plume over the Petrel Field. Ethane, propane, and butane anomalies correlate with methane results, showing an equivalent seepage distribution. This plume appears to originate in the vicinity of the Petrel #1 Well and may indicate a leaky well casing or underwater vent at this site. A second, lower magnitude anomaly is located to the west of the larger plume and represents a subsurface seep, suggesting a northwest extension of the existing field. The composition of the Petrel Field seeps indicates a gas to gas condensate signature which matches the composition of the reservoir gases at this site.
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