Oil production in Kansas jumped by about 3.1 million barrels, or 7 percent, in 2013, according to the Kansas Geological Survey.

Production rose from 43.7 million barrels in 2012 to 46.8 million in 2013, an increase that represents an additional $400 million in value.

The value of the state’s natural gas production also rose, by about $310 million, even though gas production in Kansas declined by 1.5 percent in 2013.

Driven by high prices, the increased oil production has been largely focused in the Mississippian limestone play, an area 5,000 feet underground in southern and western Kansas, the survey said. Harper County, in south central Kansas, saw oil production rise 98.5 percent and gas production rise 84.3 percent during the year.

Companies have largely used a combination of horizontal drilling and hydraulic fracturing techniques, or “fracking,” to reach the oil in that area.

At 3.5 million barrels in 2013, Ellis County, in the northwest part of the state, is still the top producer in Kansas.

Douglas County produced 64,135 barrels of oil last year, up from 51,718 in 2012.