CSCD来源期刊

北大中文核心期刊

中国科技核心期刊

地学领域高质量科技期刊分级T2区（2023）

世界期刊影响力指数报告Q1区（2023）

Volume 42 Issue 6
Nov.  2023
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Article Contents
Article Navigation >  Bulletin of Geological Science and Technology  > 2023  >  42(6): 281-296
Tan Yuhan, Zhang Fengsheng, Yao Yabin, Wu Heng, Nian Tao. Logging evaluation of shale laminae: A case study from the Wufeng-Longmaxi formations in the southern Sichuan Basin[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 281-296. doi: 10.19509/j.cnki.dzkq.tb20220385
Citation: Tan Yuhan, Zhang Fengsheng, Yao Yabin, Wu Heng, Nian Tao. Logging evaluation of shale laminae: A case study from the Wufeng-Longmaxi formations in the southern Sichuan Basin[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 281-296. doi: 10.19509/j.cnki.dzkq.tb20220385
shu

Logging evaluation of shale laminae: A case study from the Wufeng-Longmaxi formations in the southern Sichuan Basin

doi: 10.19509/j.cnki.dzkq.tb20220385
  • 1.

    Geological Research Institute, CNPC Logging Company Limited, Xi'an 710000, China

  • 2.

    Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China

  • 3.

    School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China

  • Received Date: 19 Jul 2022
  • Accepted Date: 13 Sep 2022
  • Rev Recd Date: 07 Sep 2022
    Abstract
  • <p>Shale laminae influence shale reservoir quality and fracturing, whereas previous studies are simply based on geological materials. Taking full advantage of geophysical logging data could provide novel insights for shale laminae evaluation in drilled boreholes.</p></sec><sec><title>Methods

    Cored boreholes in the Wufeng-Longmaxi formations in the southern Sichuan Basin are utilized in this study. Shale cores, CT scanning based on full-diameter cores, large-sized thin sections, X-ray diffraction, and TOC content are first integrated to clarify shale laminae fabrics. Elemental scanning, microresistivity electrical imaging, multipole array acoustic, conventional and nuclear magnetic resonance logging techniques are interpreted to characterize shale laminae by geological calibration, and the methodology of logging evaluation on shale laminae has been set out.

    Results

    It is concluded that the target formation has developed four types of bed, includingthe silicic bed (lamina poorly developed), silicic lamina, calcareous lamina, and argillaceous lamina. Elemental scanning is implemented to determine laminae minerals and TOC content. Electrical imaging and the anisotropy index derived from multipole array acoustic and conventional logs are used to evaluate lamina density or development degree. Besides, electrical imaging is able to reflect the lamina thickness. Nuclear magnetic resonance is performed to analyze the variation in lamina pore structure.

    Conclusion

    Although logging resolution and response complexity can significantly affect the accuracy of logging interpretation of shale laminae, logging techniques rooted in petrophysical properties are valuable supplements for the evaluation of shale laminae and lamina associations.

     

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