Petroleum industry in Nigeria to transport the crude oil. Also because of the lack of highly productive fields, money from the jointly operated (with the federal government) companies is constantly directed towards petroleum exploration and production. Nigeria's petroleum is classified mostly as "light" and "sweet", as the oil is largely free of sulphur. Nigeria is the largest producer of sweet oil in OPEC. This sweet oil is similar in composition to petroleum extracted from the North Sea. This crude oil is known as "Bonny light". Names of other Nigerian crudes, all of which are named according to export terminal, are Qua Ibo, Escravos blend,
Nigerian Ports Authority and Port Harcourt ports, the initial law also gave it the responsibility of managing harbours and approaches to all ports in the country. By 1963 the firm had grown successfully, it was operating a cargo ship from Lagos to Port Harcourt and also began dredging the Bonny terminal for oil operations. In the same year, the firm issued a £4.3 million loan stock in London. From 1962 - 1968, under the Nigerian Development plan, the length of the quays was expanded and additional warehouses and cargo handling equipment were added. During the Nigerian Civil War that lasted from 1967-1969, only