استفاده از شبکه عصبی مرکب (Committee Machine) نظارت شده جهت بهبود الگوریتم شبکه های عصبی در تخمین تراوایی مخازن نفتی
نویسندگان
1صادق کریم پولی؛ 2نادر فتحیان پور ؛ 2جابر روحی
1دانشگاه صنعتی امیرکبیر
2دانشگاه صنعتی اصفهان
چکیده
Reservoir permeability is a critical parameter for the evaluation of hydrocarbon reservoirs. There are a lot of well log data related with this parameter. In this study, permeability is predicted using them and a supervised committee machine neural network (SCMNN) which is combined of 30 estimators. All of data were divided in two low and high permeability populations using statistical study. Each estimator of SCMNN was combined of two simple networks to predict permeability in both low and high classes and one gating network, considered as a classifier, classified data to these two classes. Thus, each low and/or high input data would predict in related network. This SCMNN was used to predict permeability on the data of one of petroleum reservoirs of south-west of Iran. 210 samples of this reservoir were available. Because of the fewness of data 80% of them were used as training data and 20% of them were used as validation and testing data. The overall fitting between predicted permeability versus measured ones was qualified through R2 (R=correlation coefficient) to be 97.72% which is considered appropriate. Whereas, R2 in the simple network in the best stat was 84.14%. The high power and efficiency of SCMNN are indicated by lower bias and better R2 in results.
کلیدواژگان
Neural Network – Supervised Committee Machine Neural Networks (SCMNN) - Permeability prediction - Petroleum Reservoir
______________________________________
http://www.mediafire.com/view/hf6raauozksmz92/502.pdf
