Abstract: MDT log, compared with conventional log tools, has played a much more important part in petroleum exploration due to its technical advantages except for its higher testing cost. It is undoubted that for different objects and purposes of evaluation, to perform well field operation, minimize ineffective test spots and enhance the successful rate to test are necessary for realizing minimum well log costs and maximum geologic effectiveness, in other words, using a part of high investrnent to get high efficiency of whole explorative project in return. Therefore, for application of this approach, the suitable geologic condition,designing nethods prior to test and relevant notices for testing are studied systematically, developing a set of feasible field operations and interpretation methods in this paper.

Key words: well log, formation test, log interpretation, application