Multiple cracks in VTI rocks : Effective properties and fracture characterization

摘要: The existing fracture-characterization techniques are based on assuming the unfractured host rock either to be isotropic or magnitudes of both background and crack-induced anisotropies small. I relax assumptions examine effective media caused by fractures with realistic (not small) crack densities in a strongly anisotropic, primarily transversely (TI) rock. analysis penny-shaped cracks noninteraction approximation (NIA) reveals dependence their excess fracture compliance tensors orientation symmetry axis. As result this dependence, tensor generally becomes rotationally noninvariant even when circular. One consequences complication (compared isotropy) is reduction from TI monoclinic resulting presence single oriented set. Verti–cal dry vertically (VTI) consti...