Africa was lower due to the decline of production in Libya and the effect of price and other factors on production sharing contracts.
Daily sales volumes increased from 699,000 BOE per day in the fourth quarter of 2010 to 749,000 BOE per day in the fourth quarter of 2011.
Oxy’s realized price for worldwide crude oil was $99.62 per barrel for the fourth quarter of 2011, compared with $79.96 per barrel for the fourth quarter of 2010. The fourth quarter of 2011 realized oil price represents 106 percent of the average WTI and 91 percent of the average Brent price for the quarter. Worldwide NGL prices were $55.25 per barrel in the fourth quarter of 2011, compared with $49.17 per barrel in the fourth quarter of 2010. Domestic gas prices decreased from $4.13 per MCF in the fourth quarter of 2010 to $3.59 per MCF for the fourth quarter of 2011.
Chemicals
Chemical segment earnings for the fourth quarter of 2011 were $144 million, compared to $111 million in the fourth quarter of 2010. The improvement in fourth quarter results on a year-over-year basis was primarily due to higher caustic soda pricing, which more than offset higher feedstock costs.
Midstream, Marketing and Other
Midstream segment earnings were $70 million for the fourth quarter of 2011, compared with $202 million for the fourth quarter of 2010. The decline in earnings for the fourth quarter of 2011 was primarily due to lower marketing and trading results.
TWELVE-MONTH RESULTS
Oil and Gas
Oil and gas segment earnings were $10.2 billion for the twelve months of 2011, compared with $7.2 billion for the same period of 2010. Oil and gas core earnings, after excluding asset impairments, were $10.3 billion for the twelve months of 2011, compared with $7.4 billion for the same period of 2010. The $2.9 billion increase in the 2011 results reflected higher crude oil and NGL prices and sales volumes, partially offset by higher operating costs and DD&A rates.
Oil and gas production volumes for twelve months were 733,000 BOE per day for 2011, compared with 706,000 BOE per day for 2010. Higher year-over-year average oil prices and other factors affecting production sharing and similar contracts lowered the Middle East/North Africa, Colombia and Long Beach production by 18,000 BOE per day.
Domestic volumes increased primarily due to new operations in South Texas, California and the Williston Basin. Middle East/North Africa production declined due to impacts of price and other factors on production sharing contracts and lower production in Libya, partially offset by higher production in Oman’s Mukhaizna field and Iraq.
Daily sales volumes were 731,000 BOE in 2011, compared with 701,000 BOE for 2010.
Oxy's realized prices improved for crude oil and NGLs but declined for natural gas on a year-over-year basis. Realizations for crude oil and NGLs rose 30 percent and 23 percent, respectively, and fell 10 percent for natural gas. Worldwide crude oil prices were $97.92 per barrel for the twelve months of 2011, compared with $75.16 per barrel for 2010. Worldwide NGL prices were $55.53 per barrel for the