By Elisha Bala-Gbogbo

ABUJA (Reuters) -Global demand for all forms of energy is forecast to rise by 23% through 2045, OPEC Secretary General Haitham Al Ghais told a Nigerian oil and gas conference on Tuesday.

Oil executives and officials from the Organization of the Petroleum Exporting Countries (OPEC) have repeatedly made the case for continued investment in oil, warning that prices will otherwise spike higher.

Al Ghais also said calls to limit or stop funding new oil projects were unrealistic and unwise. He acknowledged, however, the need for technology to tackle continued fossil fuel emissions.

"Global primary energy demand is forecast to increase by a significant 23% in the period up to 2045, which means we will need all forms of energy," he said.

"We will require innovative solutions such as carbon capture utilisation and storage, and hydrogen projects in addition to a circular carbon economy, which has received a positive endorsement from the G20."

The global oil industry needs $12.1 trillion in investment during the same period, Al Ghais said, adding the industry was not on track to reach that level of investment yet.

Sources close to OPEC have said it will likely maintain an upbeat view on oil demand growth for next year when it publishes its first outlook later this month, predicting a slowdown from this year but still an above-average increase.

OPEC's forecast for 2024 will likely be lower than the growth it expects for this year of 2.35 million barrels per day, or 2.4%, an abnormally high rate as the world moves out of the COVID-19 pandemic.

(Reporting by Elisha Bala-Gbogbo; Writing by Bhargav Acharya and MacDonald Dzirutwe; Editing by Alexander Winning and Barbara Lewis)