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,
Lam Qua painter to settle in China – although Chinnery himself denied this. Lam Qua became well-known and skilled in Chinnery's style of portraiture. He developed a following among the international community, and undercut Chinnery's prices. From 1836 to 1855, Lam Qua produced a series of medical portraits of patients under treatment with physician Peter Parker, a medical missionary from the United States. Parker commissioned Lam Qua to paint pre-operative portraits of patients who had large tumors or other major deformities. Some of the paintings are now part of a collection of Lam Qua's work held by the Yale University in the