Abstract: In the light of identification of production decline type in actual production, the useful supplement to the chart of generalized decline curve were made based on the basic theory of production decline.New generalized decline curve equation and chart of standard decline curve type were established, and a simple method for determining initial decline rate from standard chart was presented.Case study shows that this method is more suitable for production decline analyses in oilfield development, and easily understood by reservoir engineers.

Key words: Production decline, Graphic solution, Standard, Chart, Decline rate