A fast method to infer Nuclear Magnetic Resonance based effective porosity in carbonate rocks using machine learning techniques
Name:
JPSE_Fast_Method_to_Infer_NMR_based_Effective_Porosity.pdf
Size:
15.16Mb
Format:
PDF
Description:
Accepted Manuscript
Embargo End Date:
2025-01-11
Name:
1-s2.0-S2949891022000215-ga1_lrg.jpg
Size:
211.3Kb
Format:
JPEG image
Description:
Graphical abstract
Type
ArticleKAUST Department
Energy Resources and Petroleum Engineering Program, Physical Science and Engineering (PSE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi ArabiaComputational Transport Phenomena Laboratory (CTPL), Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Earth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Energy Resources and Petroleum Engineering Program
Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
KAUST Grant Number
BAS/1/1351-01-01BAS/1/1423-01-01
URF/1/4074-01-01
Date
2023-01-11Embargo End Date
2025-01-11Permanent link to this record
http://hdl.handle.net/10754/687007
Metadata
Show full item recordAbstract
A better estimation of the effective porosity of the reservoir rock is a critical task for petrophysicist and well logs analyst. A majority of the current approaches to estimate the effective porosity of the reservoir rocks from well logs are based on the information of the Density-Neutron logs. These approaches usually resulted in the inaccurate estimation of the rock porosity particularly in the naturally fractured carbonates or dolomite rocks. The Nuclear Magnetic Resonance (NMR) based effective porosity is independent of the rock matrix and mineralogy, on contrary it depends on the number of hydrogen nuclei in the pore spaces of the rock. In this study, we have used six machine learning (ML) techniques to predict the NMR based effective porosity in carbonate rocks. The ML models to predict the effective porosity includes deep neural networks (DNN), random forest regressor (RF), decision trees (DT), K-Nearest Neighbors algorithm (KNN), extreme gradient boosting (XGB), and adaptive gradient boosting (AdaBoost). These models were trained on the geophysical well logs such as Gamma ray log (GR), caliper log (Cali), neutron porosity log (NPHI), photoelectric factor log (PE), and bulk density log (RHOB). A total of 4002 data points were obtained from the five wells located in the carbonate field. The tuning of ML models hyperparameters were conducted using a ‘GridSearchCv’ method. Furthermore, the K-fold cross-validation criterion was implemented to improve the accuracy of the ML models. The ML models performances were evaluated using multiple graphical and goodness of fit tests including prediction cross-plots, average absolute percentage error (AAPE), root means square error (RMSE), and coefficient of determination (R) methods. The prediction results showed that the DNN, RF, and XGB models performed better than the other implemented ML techniques. These methods resulted in a significantly low error and high (R). The achieved accuracy was above 85% when validated on a blind dataset. This study also offered an empirical model that can be used to quickly estimate the NMR based effective porosity using afore-mentioned well logs. The model can also be used as a standalone package that can be coupled with any logging software for quick evaluation of NMR based effective porosity.Citation
Tariq, Z., Gudala, M., Yan, B., Sun, S., & Mahmoud, M. (2023). A fast method to infer Nuclear Magnetic Resonance based effective porosity in carbonate rocks using machine learning techniques. Geoenergy Science and Engineering, 211333. https://doi.org/10.1016/j.geoen.2022.211333Sponsors
Zeeshan Tariq and Bicheng yan thanks King Abdullah University of Science and Technology (KAUST), Saudi Arabia for the Research Funding through the grants BAS/1/1423-01-01, and Zeeshan Tariq and Shuyu Sun thanks for the Research Funding from King Abdullah University of Science and Technology (KAUST), Saudi Arabia through the grants BAS/1/1351-01-01 and URF/1/4074-01-01.Publisher
Elsevier BVAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S2949891022000215ae974a485f413a2113503eed53cd6c53
10.1016/j.geoen.2022.211333