Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 258-266.doi: 10.12108/yxyqc.20210124

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Lithology identification of Carboniferous volcanic rocks in Xiquan area, eastern Junggar Basin

LI Shubo, GUO Xuguang, ZHENG Menglin, WANG Zesheng, LIU Xinlong   

  1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2020-08-07 Revised:2020-10-28 Online:2021-02-01 Published:2021-01-25

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Abstract: Effective and accurate lithology identification is one of the most important foundations for volcanic reservoir exploration. Aiming at the Carboniferous volcanic rocks in Xiquan area of the eastern Junggar Basin, based on a large amount of coring data and micro-slice data,six well logging curves which were sensitive to lithology were selected,and each of them were standardized to establish a random sample by principal component analysis,and two comprehensive variables Y1 and Y2 with a cumulative variance contribution rate of 86.798% were constructed to improve the sensitivity of logging response characteristics between different lithologies. The typical discriminant analysis method was used to establish discriminant models for nine different lithologies of Carboniferous volcanic rocks in the study area to identify volcanic rocks. The back-judgmental inspection and cross-validation of the original samples show that the accuracy of lithology identification was improved by using this method,its comprehensive accuracy of lithology identification was over 91%. The correlation and overlap of lithologic information carried by logging curves were effectively eliminated,and the accuracy of this method is higher than that of conventional lithology identification methods in thin interbedded volcanic rocks identification. The study provides a reference for accurate lithology identification of volcanic rocks in the study area.

Key words: volcanic rocks, lithology identification, data mining method, Xiquan area, Junggar Basin

CLC Number: 

  • P618.13
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