Abstract：The logging interpretation software SHIVA of six-arm dipmeter which developed in American Ilallibuton Logging Service Company uses calculation method for stratigraphic attitulle based on spherical projection technology,which comes from mapping of apparent dip vector on spherical plane and projection plane and transforms the definition of stratigraphie attitude to definition of coordinate of points in mapping plane according to the basic principle that the two incorrelate apparent dip vectors in a same plane can uniquely define a plane.The method is suitable for character of six-arm dipmeter.The paper deeply and in detail approached the basic principle of stratigraphic attitude definition based on spherical prajection and analyzed the application of the technology to logging data processing of six arm dipmeter.
