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Permeability determination of cores based on their apparent attributes in the Persian Gulf region using navie bayesian and Random forest algorithms

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JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 2017年 37卷 52-68页

作者： Far, Pouria Behnoud Hosseini, Pantea Azizi, Ali Amirkabir Univ Technol Dept Petr Engn Tehran Iran Islamic Azad Univ Dept Software Engn Esfahan Iran

To properly study a reservoir, one needs to consider permeability as one of the most important parameters. Regions of sufficiently high permeability are good production candidates. Several permeability determination methods have been suggested which mostly employ evaluations through well testing as well as laboratory core experiments. Nevertheless, these methods are costly and time consuming. Among them exists the air permeability determination using an Ultra-permeameter with regard to the Darcy's law which requires properly set up apparatus and takes time for each core. This paper presents a new method for estimating the air permeability in the Persian Gulf region with regard to the appearance of a core. Appearance attributes are divided into several groups enjoying the Archie's classification method while keeping in mind other parameters such as porosity, depth at which cores were taken and density. Air permeability values obtained for 718 cores are subdivided into four classes. Direct and indirect relations of the studied parameters on permeability are distinguished. For instance, porosity influences permeability. Having a crystalline matrix affects porosity, then has an indirect effect on permeability. The next step involves employing navie bayesian and a designed Random forest algorithm to develop a model for permeability estimation. It is observed that the model based on navie bayesian gives acceptably precise results whereas the model obtained using Random forest algorithm offers permeability estimations of higher accuracy especially in case of higher permeabilities. The models are applied on a second reservoir in the Persian Gulf. Two models predict the permeability with a decent confidence. This new approach has the privilege of being fast and convincingly accurate. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Persian Gulf Permeability Archie's classification navie bayesian algorithm Random forest algorithm Apparent attributes

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