Abstract: There are a lot of short comings,such as long period,high cost and harsh condition of test in evaluatiing damaged formations by the method of unstable well testing,or normal method in room,or particular core analysis.On the basis of combing with the data form drilling,well testing,core analysis and engineering,we evaluated and analysised the damages degree of formations according to the logging evaluation method in this paper.In the course of the study,we took full use of logging information.After evaluation the damaged formation quantittatively,we discussed the law concerned.

Key words: formation damage, skin coefficient, demage ratio, software system, electric logging