Sakhalin-1 update boosts oil reserves 4.3 mln tonnes, cuts gas 14.3 bcm at Arukutun-Dagi, Odoptu
MOSCOW. Nov 8 (Interfax) - The updated technological scheme for development of the Sakhalin-1 project approved by the State Reserves Commission in August stipulates increases oil reserves by 4.3 million tonnes and decreases gas reserves by 15.5 billion cubic meters, the Natural Resources and Environment Ministry reported.
"Exxon Neftegaz presented materials in connection with a state expert review concerning recalculation of oil and gas reserves and new project documents on development of the Odoptu and Arkutun-Dagi fields," it said.
"A revaluation of initial recoverable oil reserves (category AB1) for the entire Odoptu field, increased by 2.026 million tonnes to 62.46 million tonnes and reserves of free gas and gas cap (category B1) decreased by 9.94 bcm to 72.86 bcm. The reduction in recoverable gas reserves is due to the gas recovery ratio - 0.815 - used by the project development document. "According to the new project document, cumulative oil production at the Odoptu field in the 2018-2051 period is forecast at 45.7 million tonnes, compared with the cumulative production for the period agreed in the previous documents, 44 million tonnes," the materials said.
"Initial recoverable oil reserves (AB1) at the Arkutun-Dagi field increased by 2.256 million tonnes to 131.36 million tonnes and initial recoverable reserves of dissolved gas increased by 1.281 bcm to 13.7 bcm, while initial recoverable reserves of associated petroleum gas and gas cap decreased by 5.6 bcm to 38.7 bcm. The decline in APG and gas caps is due to the recovery ratio of 0.745," it said.
"In accordance with the project document approved in 2015, cumulative oil production in the 2018-2051 period was to total 113.6 million tonnes; under the new supplement to the technological scheme - 107.5 million tonnes."
Rosnedra approved the updated technological schemes for Odoptu and Arkutun-Dagi on August 31, 2018.