Abstract:

The Zhu-3 depression in Pearl River Mouth Basin is a typical dustpan-shaped basin faulted in its south and overlapping to the north.It belongs to a marginal sea basin abundant in oil and gas resources.Three petroleum systems,namely the Wenchang A,Wenchang B,and Wenchang C,can be recognized in accordance with the strong controlling effect of the major faults.Different types of reservoirs had been developed in different structural zones:buried-hill or buried hill drape anticline hydrocarbon reservoirs and local stratigraphic overlap reservoirs in the gentle slope zone and its peripheral uplift zone,lithological-structural reservoir near the major faults,slump subtle reservoirs of fan delta front in the steep slope zone,and lenticular distal turbidite fan reservoirs in central basin.It is suggested that the unconformity-lithological reservoirs in the gentle slope zone and lenticular reservoirs in the central basin be favorable near-term exploration targets.

Key words: reservoir profile, hydrocarbon pooling pattern, subtle reservoir type, Zhu-3 Depression, Pearl River Mouth Basin