Economy of Nigeria imports a significant amount of food to sustain itself. However, efforts are being made towards making the country food sufficient again. Nigeria's proven oil reserves are estimated to be ; natural gas reserves are well over . Nigeria is a member of the Organization of Petroleum Exporting Countries (OPEC). The types of crude oil exported by Nigeria are Bonny light oil, Forcados crude oil, Qua Ibo crude oil and Brass River crude oil. Poor corporate relations with indigenous communities, vandalism of oil infrastructure, severe ecological damage, and personal security problems throughout the Niger Delta oil-producing region continue to plague Nigeria's
Nigerian Civil War of 250,000 pounds. The news of this payment reached the Federal government, which immediately extended the shipping embargo to oil tankers The Nigerian government also made it clear to Shell-BP that it expected the company to pay all outstanding oil royalty immediately. With the stalling on the payment for Biafra government ask Shell-BP to stop operations in Biafra and took over from the company. Towards the end of July 1967, Nigerian federal troops and marines captured Bonny Island in the Niger Delta, thereby taking control of vital Shell-BP facilities. Operations began again in May 1968, when Nigeria captured Port Harcourt.