FORT WORTH, Texas (AP) — Production from the natural gas-rich Barnett Shale in North Texas has risen even as drilling activity and natural gas prices have fallen, according to a study commissioned by the Fort Worth Chamber of Commerce released Wednesday.

The Waco, Texas-based Perryman Group analysis shows that oil and gas drilling in the Barnett Shale is contributing $11.8 billion annually to the North Texas economy, up from $11.1 billion per year in 2011. Drilling adds $480.6 million in taxes to local cities, counties and school districts, the study says.

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