Marble Falls yields Jack County's most productive well

James D. Henry Old Aulacogen LP Frisco, Tex. The early Pennsylvanian Marble Falls formation has recently been determined to be a fractured carbonate reservoir much like the famous Barnett shale. The Marble Falls lies a few hundred feet shallower than the Barnett and is sourced by it. In May 2010, Halek Energy of Southlake, Tex., drilled the 8 Johnson well as a horizontal borehole just north of Bartons Chapel in rural southwestern Jack County. This was the breakthrough well in the entire Fort Worth basin for the concept of directionally drilling the Marble Falls limestone. The Marble Falls formation has been a ubiquitous, albeit modest, reservoir in the Fort Worth basin for decades, and un...

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