Saudi Arabia's Energy Minister Khalid al-Falih will not attend meetings on Oct. 12 between OPEC and non-OPEC countries in Istanbul but told Reuters he saw signs that countries outside OPEC were willing to contribute to balancing the oil market.

"Tomorrow's meeting is a very informal consultative meeting between the countries that happened to be here," Falih told Reuters at the World Energy Congress in Istanbul.

"Unfortunately due to prior commitments I am leaving now so I will not be in the meeting but I will be following it from afar and I will be getting indications about what countries have agreed to," he said.

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OPEC officials are embarking on a flurry of meetings to nail down details of an agreement reached in Algiers last month on modest oil output cuts, the first such deal since 2008.

Falih said he had met with Russian Energy Minister Alexander Novak in Istanbul, and described the energy conference in the Turkish city as a "great step forward".

"From the meetings I have had on the sidelines of this conference today and yesterday ... it is quite clear that many countries are not only supportive of the OPEC decision in Algiers but are enthusiastically willing to join," he said.

"We are not talking about support, we are talking about contribution in the direction we are seeking which is basically that we are going to attempt to speed up the balancing process that is already underway."

Falih said those efforts were not about the oil price itself, but about sending a signal to the oil industry to start investing again.