Applying the theory of the cut edge and connectivity concerning non directed graph in the graph theory,this paper deals with the concept of the principal cut edge and secondary connectivity,derives several related properties,and puts forward an effective method to seek systematically a Eulers path from the non directed praph the method of non principal cut edge.

Based on FMT pressure analysis of this oilfield, the net thickness, reservoir type, fluid interface and reservoir communication are confirmed, coming to advisably divide the calculation units and improve the accuracy of reserves calculation.

After a number of application examples of Wireline Formation Test are collected and compiled in Bohai region,an analysis is conducted,focusing on its responses to reservoir communication,fluid properties,reservoir petrophysics,etc.