Fracture patterns and their origin in the Upper Devonian Antrim Shale gas reservoir of the Michigan basin: A review

Robert T. Ryder

Open-File Report 96-23

Figure 5 Borehole map of the Rachow B3-31 well, Otsego County, Michigan (Caramanica, 1993) showing fracture intensity in the Antrim Shale. See fig. 3 for location

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U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/1996/of96-023/figure5.htm
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