LOG PROCESSING AND FRACTURE CHARACTERIZATION IN BIAXIALLY ANISOTROPIC FORMATIONS

摘要

Evaluation of formation and fracture characteristics based on multicomponent induction (MCI) log data includes automated calculation of inverted biaxial anisotropy (BA) parameters for the formation by performing an iterative BA inversion operation based on the MCI log data and using a BA formation model that accounts for transfers by axial formation anisotropy to resistivity. The BA inversion operation can be combined with a transversely anisotropic (TI) inversion based on the MCI log data and using a TI formation model, to calculate inverted TI parameters for the formation. The inverted BA parameters and the inverted TI parameters can be used, in combination, to calculate a quantified value for an identification function, to indicate estimated presence or absence of a fracture in the formation.

主权项

1. A method comprising:
accessing multicomponent induction (MCI) measurement data indicative of resistivity measurements captured by a measurement tool in a borehole extending through a subsurface formation; in an automated procedure using one or more computer processors, calculating inverted biaxial anisotropy (BA) parameters by performing an iterative BA inversion operation based on the MCI measurement data using a BA formation model that represents simulated formation resistivity characteristics that account for transverse biaxial formation anisotropy to resistivity; and operating a controlled device based at least in part on the inverted BA parameters.