UPDATE 1-Under shadow of OPEC cuts, Angola to launch big oil block

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LONDON, March 8 (Reuters) - The first vessel that will pump and store oil for Angola's 230,000 barrels per day (bpd) Kaombo project is en route to the West African nation, operator Total said on Thursday.

The Kaombo oil block will produce its first oil this summer, Total said. Once it is fully up and running, it will add roughly 14 percent to the OPEC member nation's average 2017 output of 1.632 million bpd.

The Kaombo Norte floating production, storage and offloading (FPSO) vessel left Singapore earlier this week, Total said. The vessel has a capacity to pump 115,000 bpd, half the oil block's eventual production. The second FPSO, Kaombo Sul, is still in Singapore.

The $16 billion offshore project will add a significant amount of oil to Africa's number two exporter at a time when the nation is bound by output limits under a deal orchestrated by the Organization of the Petroleum Exporting Countries.

OPEC is reducing output by roughly 1.2 million bpd as part of a deal with Russia and other producers that began in January 2017 and was extended until the end of 2018.

So far, Angola has complied comfortably with the deal, pumping even less than the maximum agreed. Last month, its output of 1.6 million bpd amounted to 194 percent of compliance with promised cuts of 78,000 bpd.

Declining production at mature fields has cut into Angola's output, but the Kaombo addition could complicate efforts to maintain compliance. Angola's state oil company Sonangol has said production will be roughly steady this year. (Reporting by Libby George; Editing by Susan Fenton and Mark Potter)