A new method for logging identification of fluid properties in tight sandstone gas reservoirs based on gray correlation weight analysis — A case study of the Middle Jurassic Shaximiao Formation on the eastern slope of the Western Sichuan Depression, China

• DOI: 10.1190/int-2020-0247.1
• Publication Date: 2021-08-19T14:35:06Z
• Authors: Shaoke Feng; Runcheng Xie; Wen Zhou; Shuai Yin; Meizhou Deng; Jun Chen; Zhentao Zhang; Mingliang Xiang; Ziwei Luo
• Keywords: Gray (unit); Natural gas field; Tight gas; Fracturing fluid

Energy exploration is becoming increasingly complex worldwide, and tight sandstone gas an important field for the future development of oil industry. For reservoir properties Shaximiao Gas Reservoir on eastern slope Western Sichuan Depression in Basin, western China, it was found that low-resistance characteristics complicate gray among fluid property parameters. Some commonly used identification techniques, such as flow zone index method, correlation analysis method logging parameters, traditional mathematical statistical methods, have poor evaluation results. Therefore, how to eliminate influence features parameters accurately identify are urgent problems need be solved. In this paper, we developed a new identifying reservoirs by combining system theory multivariate theory. This can perform weight (combined parameters) closely related properties; furthermore, based properties. The results indicate characterize comprehensive good agreement with production status studied reservoir. We target layer 58 wells study area, discrimination rate model 86.5%. addition, predict 12 newly drilled area accuracy prediction 91.67%.