(Bloomberg) -- Occidental Petroleum Corp., the second largest oil producer in the Permian Basin of West Texas and New Mexico, told buyers that it will be forced to curtail oil deliveries due to complications from the historic freeze in the region.

The company said that weather disrupted transportation facilities and forced delays in the receipt and delivery oil by carries, according to a force majeure notice to customers seen by Bloomberg. Oxy also expects curtailments of shipments downstream because of limited deliveries into Midland, Houston and Corpus Christi in Texas.

The force majeure is the first to surface among the oil giants of Texas’s Permian Basin and underscores the deepening crisis across America’s energy complex as a result of an unprecedented cold blast that began Thursday. More than two million barrels oil production a day has been halted due to well freeze-ups, icy roads and power losses.

The company said it is unsure how long the volume reductions would last.

The Houston-based company is the single largest oil driller in the Permian Basin, the nation’s most prolific oil field. The prolific shale field is expected to bear the brunt of the production loss.

Texas produced 4.65 million barrels a day of oil on average in November, according to the most recent data from the U.S. Energy Information Administration.

Media officials with then company didn’t respond to email seeking comment.

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