CNOOC has discovered oil and gas in Paleozoic granite buried hills in the Beibu Gulf in the South China Sea.
Exploration well WZ10-5-1Sa was drilled on the Weizhou 10-5 oil and gas field in 37 m water depth. It encountered a 283-m oil and gas pay zone with a total drilled depth of about 4,840 m.
Results suggest the well can produce 13.2 MMcf/d of gas and 800 bbl/d of crude.
Xu Changgui, CNOOC’s chief geologist, said, “The Weixinan Sag in the Beibu Gulf basin is one of the most explored sags offshore China. In recent years, the company has been researching on the reservoir formation theories of the complex buried hills and the relevant technologies needed.
“The breakthrough in the exploration of Paleozoic granite buried hills reveals the vast exploration prospects of the buried hills in the…basin. It will also provide guidance for exploration in similar fields offshore China.”
