Effect of anisotropy (lamination) on rock fracability for Vertical Transverse Isotropic (VTI) unconventional reservoirs, a comparison between upper (Highstand System Tract - HST) and middle (Transgressive System Tract - TST) Woodford Shale

摘要

The Woodford Shale like many other self-source unconventional rocks is evidently anisotropic. However, anisotropy (lamination/bedding) is not commonly included when defining "fracability". Micro-resistivity logs, Core (Wyche-1) and thin section inspection illustrates that middle and lower Woodford Shale brittle intervals are characterized by more frequent and visible laminae, in comparison with the upper Woodford.