Patent ID: 8175807
Filing Date: 2012-05-08
Classification: G01V

Abstract:
1. A method for determining properties of a subterranean formation, comprising: determining at least one characterization parameter based on wave velocity measurement data, wherein the at least one characterization parameter is a variable dependent on a rock type of the subterranean formation; measuring a first elastic coefficient of a plurality of elastic coefficients using a sonic measurement tool; determining a second elastic coefficient of the plurality of elastic coefficients as a function of at least the first elastic coefficient based on a parameterized approximation equation comprising at least one selected from a group consisting of C wherein the plurality of elastic coefficients comprise C 13 , C 33 , C 44 , and C 66 , and wherein the at least one characterization parameter comprises at least one selected from a group consisting of χ, χ′, ξ, ζ, A, and B; determining an anisotropic stress profile of the subterranean formations based on a stiffness matrix of the subterranean formation comprising the plurality of elastic coefficients; and displaying the anisotropic stress profile of the subterranean formations.