RIO DE JANEIRO, Nov 10 (Reuters) - Brazilian oil and gas company OGX (OGXP3.SA: Quote, Profile, Research) has boosted its estimated crude resources to 6.7 billion barrels from 4.8 billion barrels, the company said late Monday.

It said the reserves had been certified through a study by consulting company DeGolyer and MacNaughton, which reviewed seismic data from five blocks in the offshore Campos basin and in the Espirito Santo basin.

The study also included preliminary seismic data from recently acquired blocks of the Parnaiba basin off Brazil's northern coast.

"OGX is reviewing its business plan to reflect the scope of the additional activities to support the process of transforming resources into proven reserves," the company said.

As a result of the greater resource base, OGX in 2010 will increase the number of wells it drills to 27 from the previously planned 19. (Reporting by Denise Luna, writing by Brian Ellsworth; Editing by John Picinich)