AKPO OIL PLATFORM (AFP) -- French Prime Minister Francois Fillon travelled to the Niger Delta, the restive heart of Nigeria's oil industry, Saturday amid tight security.

His journey, part of a two-day visit to Nigeria, included a brief trip by helicopter to a facility on Total's (TOT) Akpo oil and gas field, accompanied by Total chairman Christophe de Margerie.

Before visiting Akpo, Fillon, accompanied by a police and army escort of several dozen heavily armed men equipped with light armored vehicles, visited a French-owned shipyard in Onne, the nearest seaport to Nigeria's major oil town Port Harcourt.

"The Niger Delta is a strategic region" and a "major economic zone", said Fillon, who on Friday told the Nigerian armed forces that France could help pacify this region where Total pumps 15 percent of its production in Africa.

The visit went ahead despite a warning from the Movement for the Emancipation of the Niger Delta that it was declaring the whole Niger Delta a no-fly zone in protest at army raids on militant camps.

There has been an escalation of fighting in the Niger Delta over the past week and the waterways of this region of creeks and swamps are frequently the scene of pirate attacks.

The Akpo field, 70 miles from the Nigerian coast, pumps oil from depths of between 3,000 and 3,800 meters.

"This is a chance for me to come and pay homage to a very great French company," Fillon said, dismissing suggestions that the trip was a "public relations operation for Total."

Fillon, who started his Africa trip by a two-day visit to Cameroon, will return to France on Saturday night.