Formation stress magnitude and orientation calculated accurarely have not only close relation to drilling project problem,such as the borehole stability, but also have important significance for developing gas一oii field. Presently, the application study that calculate the formation stress by using image well logging data does not make a thorough investigation and study, the paper presents the method calculated formation stress using image well logging data, and summarizes the method of the formalion stress orientation determined by using image well logging data. The method is applied to interpret the formation stress of Zi2’swell on east of Sichuan using the image well logging data,and the result show that the method can accurately determinate formation stress magnitude and orientation, and can meet the
necessaries of practice product in the field.
