Abstract

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Title:: Application of Fuzzy Comprehensive Evaluation Method in the Production Dividing of Multi-layered Gas Reservoirs of Testing Wells

Author(s):: YUE Chong-wang; YANG Xiao-ming; ZHONG Xiao-qin; PAN Bao-zhi; WANG Fei; 1. School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, China; 3. School of Geoexploration Science and Technology, Jilin University, Changchun 130026, Jilin, China

Keywords:: production dividing; fuzzy comprehensive evaluation method; analytic hierarchy process; well logging; reservoir parameter; membership; Sulige gasfield

Abstract:: Production dividing is a key issue in exploration and development of multi-layered oil and gas reservoirs of testing wells. There are many factors affecting the productivity of reservoir productivity, and the influences of physical parameters are different. The qualitative problem of comprehensive evaluation was transformed into quantitative problem by fuzzy system theory, and the weights of different factors were calculated by analytic hierarchy process according to different correlations. Small layers in multi-layered gas testing well were evaluated comprehensively and selected optimally based on comprehensive evaluation coefficient, and then the productivity of multi-layered gas reservoir was reasonably divided. The method of calculating membership of evaluation factors to grade intervals was given, and the calculation method of relative weight between different factors was put forward. Furthermore, principle and concrete steps of fuzzy comprehensive evaluation method for production dividing were proposed with the example. It is verified that the application of the method in Sulige oilfield of Ordos Basin is good.