As Western banks leave, China adds Brunei to new silk road

* Chinese firm building $15 billion refinery complex offshore

* China is by far Brunei's largest foreign investor

* Brunei, China have competing claims in South China Sea

* Sultan trying to diversify economy with unemployment rising

* Reshuffles Cabinet after three yeas of recession

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By Praveen Menon

BANDAR SERI BEGAWAN, March 5 (Reuters) - On a tiny island off Brunei's northern tip on the South China Sea, thousands of Chinese workers are building a refinery and petrochemical complex, along with a bridge connecting it to the capital, Bandar Seri Begawan.

When completed, the first phase of the $3.4 billion complex on Muara Besar island, run by China's Hengyi Group, will be Brunei's largest-ever foreign investment project, and comes at a time when the oil-dependent country needs it the most.

Brunei’s oil and gas reserves are expected to run out within two decades. As production falls, oil firms won't be investing much into existing facilities, further hampering output, oil analysts say. As a result, the country’s oil revenues, which provide virtually all of Brunei’s government spending, are in steady decline.

With youth unemployment rising, Brunei's ruler, Sultan Hassanal Bolkiah, is trying to quickly reform the economy and diversify its sources of income, while fighting graft and cracking down on dissent.

Brunei's changing fortunes have been reflected its financial industry. HSBC pulled out of Brunei last year, while Citibank exited in 2014 after 41 years. Bank of China, meanwhile, opened its first branch in the sultanate in December 2016.

The Muara Besar project is promising over 10,000 jobs, at least half of which would go to fresh graduates, media reports in Brunei said. But claims that thousands of Chinese workers have been shipped in to build the complex has angered some local residents.

"There are no jobs for us, so why create some for the Chinese?" asked one shopkeeper in the capital city.

'MARITIME SILK ROAD'

Hengyi Industries, the local company building the refinery, did not respond to requests for comment. The company, founded in 2011 and based in Bandar Seri Begawan, expects to complete the first phase of the refinery and petrochemical complex on Muara Besar by the end of the year, according to its website.

A $12 billion second phase will expand the refinery capacity to 281,150 barrels per day, and build units to produce 1.5 million tonnes per year (tpy) of ethylene and 2 million tpy of paraxylene, the company said last month.

Total Chinese investment in Brunei is now estimated at $4.1 billion, according to the American Enterprise Institute's China Global investment tracker.