Abstract: An incomplete mirror-image reflection method was presented for solving the well testing interpretation of non-closed fault. The distance between testing well and fault and flow conductivity of fault can be determined by applying this method. This paper presented new concepts about fault effective conductive thickness and fault connectivity. The study results will be of great value in oil/gas reservoir description, numeric simulation and oil/gas field development.

Key words: Pressure drawdown test, Well testing interpretation, Flow conductivity, Fault, Fault throw