Summary

Data will be presented to show that Jurassic and Cretaceous reservoirs in the Papuan Basin over a strike distance of 300 km received oil charge at the same time. Four hydrocarbon charge events (H1 to H4) and two formation water flow events (W1 & W2) can be recognised. Regional oil charge (H3) was preceded by a localised gas charge event (H1), a regional hypersaline brine flow event (W1) and a second gas charge event (H2). regional oil charge (H3) was a regional meteoric water flow event (W2). Finally, in the northwest Foldbelt there was a large gas charge event (H4). Water flowing at the time of oil charge may represent dilution of W1 brine by W2 meteoric water or dispersion in diagenetically evolved pore waters.

AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah