April 11 (Reuters) - Latin American oil and gas producer

GeoPark ( GPRK ) said on Thursday it had submitted a binding

offer to acquire a non-operated working interest in

unconventional blocks in the Neuquen Basin in Argentina from an

unnamed seller.

The company said the seller has accepted its offer of around

$200 million and an additional $110 million to $120 million over

a two year period for certain exploration activities.

GeoPark ( GPRK ) said the two companies were working on an exclusive

basis on the deal, which is expected to close in the third

quarter and immediately contribute more than 5,000 net barrels

of oil equivalent of production.

Reuters reported in February that oil major Exxon Mobil ( XOM )

, which has oil and gas assets in the Vaca Muerta shale

region of the Neuquen basin, was weighing offers to sell its

assets in Argentina.

The South American country is betting on the Neuquen basin,

which comprises one of the world's biggest shale gas and oil

reserves in Vaca Muerta, to turn the country into an energy

powerhouse and curb dependence on costly imports.