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Volume 47 Issue 4
Jul.  2025
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2025  >  47(4): 895-903
ZHANG Hongfei, JIAO Kun, WANG Jiayu, XU Ning, MA Lijun, LIU Lanfeng, WU Yunjun, DENG Bin, WU Juan, YE Yuehao, GUAN Quanzhong, WANGZHOU Xiangxin, ZHANG Congke. Influence of non-thermal maturity factors on laser Raman spectroscopy of highly to overmature shale: a case study of Lower Paleozoic marine shale in southern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(4): 895-903. doi: 10.11781/sysydz2025040895
Citation: ZHANG Hongfei, JIAO Kun, WANG Jiayu, XU Ning, MA Lijun, LIU Lanfeng, WU Yunjun, DENG Bin, WU Juan, YE Yuehao, GUAN Quanzhong, WANGZHOU Xiangxin, ZHANG Congke. Influence of non-thermal maturity factors on laser Raman spectroscopy of highly to overmature shale: a case study of Lower Paleozoic marine shale in southern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(4): 895-903. doi: 10.11781/sysydz2025040895
shu

Influence of non-thermal maturity factors on laser Raman spectroscopy of highly to overmature shale: a case study of Lower Paleozoic marine shale in southern Sichuan Basin

doi: 10.11781/sysydz2025040895
  • 1.

    College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology), Chengdu, Sichuan 610059, China

  • Received Date: 2024-11-29
  • Rev Recd Date: 2025-06-04
  • Publish Date: 2025-07-28
    Abstract
  • Laser Raman spectroscopy has become increasingly prevalent in assessing the thermal maturity of ancient marine shale due to its advantages of simple sample preparation, easy operation, and non-destructive analysis. Current studies primarily focus on the response of Raman spectral parameters to thermal maturity variations, while research on the influence of non-thermal maturity factors, such as spectrum processing methods, sample pretreatment, and laser wavelength settings, on experimental accuracy remains relatively scarce and inconsistent. Using laser Raman spectroscopy, this study conducted a systematic comparative analysis of highly to overmature black shale samples from the Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation and Lower Cambrian Qiongzhusi Formation in the Sichuan Basin, with a particular focus on the impact of non-thermal maturity factors on parameters such as Raman band separation (RBS), full width at half maximum (FWHM), and the intensity ratio of D peak to G peak (ID/IG). The findings are as follows: (1) Spectrum processing methods: Two-peak fitting demonstrated lower uncertainty and higher efficiency than five-peak fitting, making it more suitable for thermal maturity assessment of highly to overmature shale, especially for the processing of Raman spectra of shale in Qiongzhusi Formation. (2) Parameter selection: Positional parameters (WD, WG, and RBS) showed thermal maturity differences of less than 2% after peak fitting, indicating high stability. Conversely, among the peak shape parameters (ID/IG, FWHM-D, FWHM-G), ID/IG was less affected by peak fitting and demonstrated better sample discrimination. Therefore, RBS and ID/IG are recommended as priority parameters in thermal maturity correlation studies. (3) Sample pretreatment: Polishing treatment has an overall impact of less than 3% on the Raman parameters of highly to overmature black shale from the Wufeng Formation and Longmaxi Formation. However, to accurately locate the dispersed organic matter within the black shale, polishing prior to Raman analysis is recommended.

     

    • All authors declare no relevant conflict of interests.
    The experiment was designed by JIAO Kun and ZHANG Hongfei. The experimental operation was completed by ZHANG Hongfei and WANG Jiayu. The manuscript was drafted and revised by JIAO Kun, ZHANG Hongfei, MA Lijun, LIU Lanfeng, WANG Jiayu, XU Ning, WU Yunjun, DENG Bin, WU Juan, YE Yuehao, GUAN Quanzhong, WANGZHOU Xiangxin, and ZHANG Congke. All authors have read the final version of the paper and consented to its submission.
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