LONDON--Oil production from the Organization of Petroleum Exporting Countries fell for the third month in a row in July, on a Saudi output cut and an embargo on Iran, according to a Dow Jones Newswires survey.

Crude-oil production from the group averaged 31.45 million barrels a day in July, down about 150,000 barrels a day from 31.60 million barrels a day in June, according to the Dow Jones survey of industry sources and analysts.

The largest drop in production of 105,000 barrels a day came from Saudi Arabia. According to JBC Energy GmbH, OPEC's largest producer has finally started cutting production due to lower oil prices and overproduction.

Iran, subject to tightening sanctions against its oil exports culminating in a total European Union embargo on Iranian crude from July 1, has continued its production decline.

Its output lost 100,000 barrels a day and reached 2.9 million barrels a day, its lowest level in more than 20 years.

TABLE OF OPEC OUTPUT - DOW JONES NEWSWIRES SURVEY (a)

(in millions of barrels a day)

             July   June   May    April  Ceiling (b) 
   Saudi     9.900  10.050 10.050 9.950 
   Iran      2.900  3.000  3.150  3.200 
   UAE       2.575  2.550  2.600  2.600 
   Kuwait    2.850  2.780  2.800  2.800 

Venezuela 2.420 2.410 2.420 2.430

   Nigeria   2.200  2.140  2.100  2.050 
   Angola    1.800  1.800  1.700  1.750 
   Libya     1.450  1.425  1.450  1.500 
   Algeria   1.150  1.210  1.150  1.150 
   Qatar     0.800  0.800  0.800  0.800 
   Ecuador   0.450  0.480  0.480  0.480 
   Iraq      2.950  2.953  2.950  3.060 
   TOTAL    31.445  31.598 31.650 31.820 30.000 (b) 

a. Dow Jones Newswires assesses OPEC output from data supplied by primary sources, traders and analysts. Totals may not add due to independent rounding of numbers.

b. At its Dec. 14, 2011, meeting in Vienna, OPEC agreed to a new production ceiling of 30 million barrels a day applying to all members, but without individual quotas for each country.

-Summer Said in Dubai contributed to this article