ASTANA, March 26 (Reuters) - The cost of the giant Tengiz oilfield expansion project in Kazakhstan has increased by about 5% from the previous $47 billion estimate, Kazakh Energy Minister Almasadam Satkaliyev told Reuters on Tuesday.

Satkaliyev said the additional spending on the project, led by Chevron, is aimed at ensuring the quality and safety of work.

The Future Growth Project and Wellhead Pressure Management Project (FGP-WPMP) is set to increase Tengiz output by 12 million metric tons a year, but expansion has been delayed by six months and is now expected by the end of this year.

Chevron holds a 50% stake in Tengizchevroil (TCO), the company developing Tengiz, Exxon Mobil owns 25%, Kazakh state firm Kazmunaigas holds 20% and 5% belongs to Russia's Lukoil.

Chevron expects TCO's expanded operations to deliver more than 1 million barrels of oil equivalent per day in 2025, compared with around 630,000 boed in 2023. (Reporting by Tamara Vaal; Writing by Olzhas Auyezov; Editing by Muralikumar Anantharaman and Eileen Soreng)