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Natural and drilling induced tensile fractures are routinely interpreted from borehole images; they provide a unique, high-resolution, borehole centric indication of the distribution and orientation of fractures for use in reservoir characterization, fracture modelling, geomechanics and comprehensive stress analysis. In shale gas wells in particular, the correct determination of in-situ stress direction is critical and misinterpretation can lead to serious errors, not only in the stress analysis, but in the overall characterization and development of the reservoir. Unfortunately, drilling enhanced natural fractures and drilling induced tensile fractures can have similar appearances on the borehole images. This paper concentrates on demonstrating a number of criteria that can be used to differentiate natural from drilling induced fractures.

Differentiation of Natural vs. Drilling Induced Fractures in Shale Gas Wells Using Borehole Images– Critical for Determination of In-situ Stress