Exxon Mobil PLC has warned that it won't be able to meet its production forecast for Qua Iboe crude oil pumped from Nigeria due to pipeline repair work.

It said in a statement late Thursday that it has declared a "force majeure" warning for shipments of its Qua Iboe crude oil -- meaning the company cannot cover the promised supply from the field.

The company said it was working to repair a section of a major pipeline and that production continues in fields which aren't affected by the damaged pipeline.

The statement did not say when the lines would be running at full capacity again.