Method and system to determine the geo-stresses regime factor Q from borehole sonic measurement modeling

摘要

Methods and systems for analyzing subterranean formations in-situ stress are disclosed. A method for extracting geological horizon on-demand from a 3D seismic data set, comprises receiving sonic log data; computing the anisotropic shear moduli C₄₄, C₅₅ and C₆₆; determining in-situ stress type and selecting an in-situ stress expression corresponding to the in-situ stress type; computing stress regime factor Q of the formation interval; and computing and outputting the maximum stress σ_H by using the stress regime factor Q, Vertical stress σ_v and Minimum horizontal stress σ_h.