Abstract: Formation and development of fractal geometry provides an effective tool for describing the property of non-Euclid geometry system (i.e. fractal system). This tool can be applied for re-understanding of oil-gas flow regularities, and improvement of traditional mathematic models for describing oil-gas movement, as well as application of it into well test analysis. The fractal derivative chart is made by the mapping principle of traditional model chart and seems to be well matched with actual data simulated with traditional model, each parameter given by it is closer to in-situ complicated conditions. The chart can be applied for development of oil-gas fields.

Key words: well test analysis, fractal mathematic model, chart