Patent ID: 7882745

Claim:
A method to invert boundary conditions for rock mass field in-situ stress computation for a geologic structure comprising: a. building a numerical model from a geological model of the geologic structure; b. inputting source data measured from the geologic structure into the numerical model; c. computing gravitational stress of the geologic structure by gravitational loading; d. computing at least one tectonic stress induced by unit tectonic effect; e. solving normal equations of penalized weighted least squares, wherein the penalized weighted least squares method is represented by: f(β)=δ′V −1 δ+ω·g(β), where δV −1 δ represents the sums of weighted square errors, g(β) represents the penalty function, and ω is the penalty parameter; f. determining whether the end criterion has been reached and if not return to step d, and if the end criterion has been reached, proceed to step g; and g. outputting boundary conditions and compute and output final in-situ stress field of the geologic structure.