Abstract:

Based on the geological characteristics of Tianfu anticlinal structure，this article puts forward the problem oft deformation geometry of high angle underthrust. It quite systematically expounds the concepts of infinitesimal and finite decimal，continuity and uniformity involved in the deformatiom geometry analysing the oil geological structures, discusses Coulomb-Mohr theoretical expression, and analyses the variable range of shear angle(A)in deformation ellipsoid. Therefore，the theoretical basis is presented to demonstrate the high angle underthrust.

Key words: Anticline, High angle underthrust, Geologic structure, Geometry deformation