Special Oil & Gas Reservoirs ›› 2025, Vol. 32 ›› Issue (4): 58-67.DOI: 10.3969/j.issn.1006-6535.2025.04.007

• Geologic Exploration • Previous Articles     Next Articles

Lithology logging identification method and application to carbonate reservoirs based on improved Stacking algorithm

LUO Shuiliang1, QI Yingqiang1, TANG Song2, RUAN Jifu2, GAO Da1, LIU Qianqian1, LI Sheng1   

  1. 1. Yangtze University, Wuhan, Hubei 430100, China;
    2. PetroChina Southwest Oil & Gas Field Company, Suining, Sichuan 629001, China
  • Received:2024-11-14 Revised:2025-05-06 Online:2025-08-25 Published:2025-09-03

Abstract: Conventional lithology identification methods for carbonate reservoirs in the Central Sichuan Area have low accuracy and weak model generalization. To address this, a lithology identification method in well logging based on an improved Stacking algorithm is proposed. This method integrates the advantages of multiple machine learning models, optimizes feature weighting strategies, and enhances the extraction of key information from logging curves, improving the accuracy and stability of complex lithology identification. Compared to traditional methods, it better captures the nonlinear relationships in logging data and reduces prediction confusion between lithology categories. The study results show that the accuracy of this method in identifying lithologies in central Sichuan carbonate reservoirs reaches 96%, an improvement of over 6 percentage point compared to traditional models. It also has lower average relative errors and better prediction performance. Combined with an efficient computing framework, the improved Stacking algorithm significantly enhances training and prediction efficiency, making lithology identification both efficient and reliable. This method effectively identifies complex lithologies and provides a valuable reference for carbonate reservoir lithology identification.

Key words: Stacking, ensemble learning, feature weighting, carbonate, lithology identification

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