LUANDA, Feb. 19 (Xinhua) -- Brazil's state-owned oil and gas giant Petrobras has started production tests after new oil discoveries were made in deep-water wells of Nzanza-1 and Cinguvu- 1, which are located in Block 15/06, some 350 km northwest of Angola's capital city Luanda, sources in the oil industry said here on Friday.

Petrobras announced the new oil discoveries in Block 15/06 in a water depth of some 1,400 meters earlier this week. The company owns 5 percent stakes in Block 15/06 and Eni, which is the operator, holds 35 percent of the working interest in it.

During the production test, the Nzanza-1 well produced oil with a density of 18 API gravity at rates above 1,600 barrels/day. At Cinguvu-1, the production test reached a maximum flow of 6,400 barrels/day of oil with a density of 23 API gravity.

The other partners in the consortium are Angola's oil giant Sonangol P&P (15 percent), SSI Fifteen Limited (20 percent), Total (15 percent), Falcon Oil Holding Angola AS (5 percent), and Statoil Angola Block 15/06 AS (5 percent).

Currently, Angola rivals Nigeria as the largest oil producer on the African continent.