Productivity Prediction Approach of Complex Tight Gas Reservoir in Yingtai Area

Productivity is the core of evaluation of undeveloped reserves. Productivity prediction is the significant content of oilfield plan deploying, development plan, dynamical analysis, oil and gas wells allocation and development plan regulation. As an example of tight gas reservoir in Yingtai area of Jilin Oilfield, according to internal factors in productivity prediction and the lithologic character of this region which consists of volcanic rock and clastic rock, this paper proposes two combination parameters to predict productivity. The different prediction results of these two methods are compared and analyzed. Based on the verification of two wells, “quasi-formation coefficient” has higher precision, the average relative error being 4%. It has reference meaning in the productivity prediction to other gas reservoirs with the same type and similar geologic conditions. Key words: Tight gas reservoir; Quasi-formation coefficient; Gas well; New well productivity; Prediction