* OPEC, non-OPEC ministers to meet on July 24 in Russia
* Nigerian minister unable to attend - Kuwait
* Nigeria, Libya may participate in technical meeting
* Libya's humanitarian needs must be considered -NOC chief (Adds Kuwait oil minister comments in paragraph 5)
ISTANBUL/LONDON, July 10 (Reuters) - Libyan and Nigerian officials may attend a joint meeting between OPEC and non-OPEC nations later this month as oil producers look for ways to cap rising production to help support oil prices.
Both countries have boosted production since they were exempted from an OPEC-led deal to cut output, weighing on global prices. This has prompted more talk among producers about including them in the pact.
"We have spoken to (OPEC Secretary General Mohammad) Barkindo and in the next two weeks there will be conversations with them (Libya and Nigeria) and possibly we will invite them to the technical summit," Russian Energy Minister Alexander Novak told reporters on the sidelines of an industry conference in Istanbul.
Six ministers from OPEC and non-OPEC nations including Kuwait, Venezuela, Algeria, Saudi Arabia, Russia and Oman will meet on July 24 in St Petersburg, Russia, to discuss the current situation in the oil market.
Nigeria's oil minister, Emmanuel Ibe Kachikwu, was invited to the meeting but is unable to attend due to another commitment, Kuwaiti Oil Minister Essam al-Marzouq told reporters at the same Istanbul event.
Instead, the group will probably ask a technical committee involving the six OPEC and non-OPEC members, which is due to convene before the ministers hold their talks, to meet Nigerian and Libyan representatives to discuss their production plans, he said.
"We extended the invitation but unfortunately there is a previous commitment for the Nigerian oil minister," the minister said. "We did not talk about capping, at least we can talk about production plans right now," he added.
The monitoring panel, called the Joint Ministerial Monitoring Committee which Kuwait chairs, could recommend expanding the pact to the wider group, which holds its next meeting in November.
Both Nigeria and Libya were given exemptions to the supply cut, under which OPEC, Russia and other non-OPEC producers are reducing their output by about 1.8 million barrels per day because their output has been curbed by conflict.
OPEC delegates have said bringing Nigeria or Libya into the production pact would likely focus on capping their output, rather than asking them to cut their supply so soon after it had recovered from involuntary curbs.
Kachikwu has said that Nigeria was not opposed in principle to joining OPEC's production cap, but would have to wait and see if production returned to acceptable levels.
OPEC has not been in touch with Libya on the issue of capping the country's output, an OPEC delegate said. The Libyan government has not received an invitation to attend the ministerial meeting in Russia, he added.
In comments to Reuters on Monday, the head of Libya's National Oil Corporation did not indicate any willingness to cap output yet, saying Libya's humanitarian problems must be considered in any talks on the subject.
NOC Chairman Mustafa Sanalla added Libya could assist with efforts to stabilize the market by informing OPEC about its plans to restore production. (Additional reporting by Ahmad Ghaddar in London; editing by Louise Heavens and David Evans)