By Julia F. Gale, Robert M. Reed, Stephen P. Becker, and Walaa Ali, Bureau of Economic Geology, Jackson School of Geological Sciences, The University of Texas at Austin, Austin, TX.
This study describes several sets of natural fractures in a Barnett Shale core from Pecos County, including partly open fractures, fractures associated with chert layers, and early deformed fractures. These are compared with fractures previously described in the Barnett Shale in the Fort Worth Basin. The steep, narrow, calcite-sealed fractures that are present in many Barnett cores in the Fort Worth Basin are important because of their likely tendency to reactivate during hydraulic fracture treatments. In the core studied here
from the Delaware Basin there are many different fracture types, including open fractures with cement bridges. The importance of natural fractures for completions in the Delaware Basin is therefore different from that in the Fort Worth Basin.
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