CNOOC hits Miocene oil in second Beibu Gulf well

Oct 15, 2014

Block 22/12 location. Map from Horizon Oil CNOOC discovered oil in its second Beibu Gulf well, WZ12-10-2, in Block 22/12, off the southern Chinese coast.

The shallow-water (36m WD) location is about 1.6km (1mi.) east-northeast of the WZ12-8W platform and about 3.2km west-southwest of the previously drilled discovery well, WZ12-10-1.

The well was drilled to 5216ft TD, where it intersected granite basement, then plugged and abandoned on 12 October.

Rig manager China Oilfield Services Ltd. is moving the Hai Yang Shi You 935 (formerly COSL 935) jackup drilling rig from the site.

Wireline evaluation data confirmed 11m of “high-porosity net oil pay” in the targeted Jiaowei T42 formation, middle Miocene fine sandstones and mudstones.

Sydney-based Horizon Oil said CNOOC has run wireline evaluation logging programs, including pressure measurements, fluid sampling, formation imaging and sidewall coring, and confirm that the oil pay in the Jiaowei T42 reservoir has favorable reservoir porosity (about 31%) and oil gravity (about 29 degree API).

CNOOC Ltd. operates Block 22/12 with a 51% interest, on behalf of partners Horizon Oil Ltd. (26.95%), Roc Oil (China) (19.6%), and Korea's Majuko Corp. (2.45%). Map from Horizon Oil.

CNOOC begins drilling off China, 11 September 2014