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Carnarvon Basin Hydrocarbon Related Diagenetic Zone (HRDZ) Study Summary Hydrocarbon leakage indicators are documented over a study area in the Carnarvon Basin. The area spans about 100km west to east and 50km north to south. The region contains the Zeewulf structure, the Griffin, Novara, Vincent Enfield and Laverda Oil Fields and the Macedon Gas Field. The leakage indicators provide valuable clues to the prospectivity of the region. All the indicators documented here are believed to be hydrocarbon related diagenetic zones (HRDZs). While leakage indicators show where a petroleum system is working or the location of an accumulation, their absence may be due to good seal rather than a lack of hydrocarbons. This is the case over the Novara and Vincent Oil Fields. Five regions showing leakage are found in the study area: Zeewulf-1, Novara NW, Griffin, Laverda and Macedon. The Zeewulf indicators support a petroleum system in the region. The Griffin indicators are subtle and may not be leakage related. The Laverda indicators are isolated but strong and provide a good indication of the local prospectivity. The HRDZs above the Macedon Gas Field are intense, extensive and accurately define the area of the field. The possible HRDZs NW of Novara may lie above an undiscovered field. An early understanding of the Laverda and Macedon HRDZs would have led to much earlier discovery dates for these fields.
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