Fractures with complex bitumen and calcite filling were recognized in cores from pilot wells at the micro and macroscales (micron to millimeter). ![]() ![]() Natural fracture intensity in the Boggess 5H and MIP-3H were interpreted based on wireline and logging while drilling (LWD) image logs showing that 1000's of calcite and bitumen cemented, but relatively weak, fractures are present along the laterals as swarms that are at an angle to the present-day stress regime. Sonic and microresistivity imaging show the presence of numerous preexisting cemented fracture swarms, which are evaluated in terms of their influence on the fracture stimulation. The Marcellus Shale Energy and Environmental Lab (MSEEL) provides a publicly available dataset and a hypothesis-driven field test of the significance of preexisting natural fractures at multiple scales on the effectiveness of the stimulation of an unconventional reservoir.
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