Estimating three-dimensional rock discontinuity orientation from digital images of fracture traces

Authors:
John Kemeny;Randy Post
Affiliations:
Department of Mining and Geological Engineering, University of Arizona, Building 12, Room 229, Tucson, AZ and Split Engineering, LLC, 110 S, Church Suite 8312, Tueson, AZ;URS Corporation, 4742 N. Oracle Rd, Suite 310, Tucson, AZ
Venue:
Computers & Geosciences
Year:
2003

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Abstract

This paper describes a computer approach that has been developed for estimating three-dimensional fracture orientations from two-dimensional fracture trace information gathered from digital images of exposed rock faces. The approach assumes that the fractures occur in sets, and that each set can be described by a mean orientation and a measure of the scatter about the mean. Mathematical relationships are developed that relate the 3D fracture properties with the trace angles that would be measured on one or more rock faces. These algorithms are used in conjunction with a genetic algorithm to invert the trace angles to estimate 3D joint orientation. A number of case studies have been conducted indicating a great potential for the technique.