Simple evaluation of the fold axis, axial plane, and interlimb angle from a borehole image log

Abstract. Folds and fractures are important structures that preserve information on the past stress evolution; however, folds remain largely unexplored. Studying remains challenging, as no simple unified method can be used to evaluate fold parameters, which include axis, axial plane, interlimb angle with depth. In this study, we propose a calculate parameters of cylindrical concentric by considering point at bedding trend changes an inflexion fold. The is identified from analysis orientation, obtained borehole image log. orientation axis plane were geometrically calculated based surfaces both ends folds. application illustrated using simulated model. It shown these depth reliable certain extent, despite uncertainty points. Although extraction assumes folds, it applied symmetric estimate planes. developed in study expected have wide range applications structural geology each traversed borehole.