LONDON (Reuters) - OPEC oil output has risen this month by 90,000 barrels per day (bpd) to a 2017 high, a Reuters survey found, led by a further recovery in supply from Libya, one of the countries exempt from a production-cutting deal.
A dip in supply from Saudi Arabia and lower Angolan exports helped to boost OPEC's adherence to its supply curbs to 84 percent. While this is up from a revised 77 percent in June, compliance in both months has fallen from levels above 90 percent earlier in the year.
The extra oil from Libya means supply by the 13 OPEC members originally part of the deal has risen far above their implied production target. Libya and Nigeria were exempt from the cuts because conflict had curbed their production.
A gain in Libyan and Nigerian output has added to the challenge the OPEC-led effort is facing to get rid of excess supply on world markets. To address this, ministers at a July 24 meeting moved to cap Nigerian output and officials are holding talks next week on improving compliance.
"There is a need to align all countries to achieve full compliance," a source close to OPEC said of the compliance talks, which will be held on Aug. 7-8 in Abu Dhabi.
As part of a deal with Russia and other non-members, the Organization of the Petroleum Exporting Countries is reducing output by about 1.2 million bpd from Jan. 1, 2017 until March next year.
High compliance with the deal, and much-reduced output in the exempt countries, pushed supply lower earlier in the year. But extra Libya and Nigerian production has prompted output to rise since May, and adherence has slipped in some other countries.
July's biggest rise came from Libya, where output, curbed by years of conflict and unrest, rose to an average of more than 1 million bpd. Production remains short of the 1.6 million bpd Libya pumped before its 2011 civil war.
Iraqi supply was revised up for June and in July output has edged higher, the survey found. Supply also increased slightly in the United Arab Emirates, Gabon and Ecuador - which said it planned to pump more, citing its lack of funds.
Among countries with lower output, the biggest decline was in Angola, which exported 50 cargoes, two less than in June. August volumes are expected to increase.
Nigeria pumped slightly less in July after an increase in June, partly due to a force majeure on Bonny crude exports. Growth could resume next month if exports reach the planned rate of at least 2 million bpd.
Top exporter Saudi Arabia pumped 50,000 bpd less, the survey found, although output in June was revised higher to just above its OPEC target. The reduction achieved by OPEC's biggest producer in July is back above the target cut of 486,000 bpd.
OPEC announced a production target of 32.50 million bpd last year, which was based on low figures for Libya and Nigeria. The target includes Indonesia, which has since left OPEC, and does not include Equatorial Guinea, the latest country to join OPEC.
The Libyan and Nigerian increases mean OPEC output in July averaged 32.85 million bpd, about 1.1 million bpd above its supply target, adjusted to remove Indonesia and not including Equatorial Guinea.
With Equatorial Guinea added, total OPEC production in July has reached 33.0 million bpd.
The Reuters survey is based on shipping data provided by external sources, Thomson Reuters flows data, and information provided by sources at oil companies, OPEC and consulting firms.
(Reporting by Alex Lawler, with additional reporting by Rania El Gamal; Editing by Jane Merriman)