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Volume 44 Issue 3
May  2025
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Article Navigation >  Bulletin of Geological Science and Technology  > 2025  >  44(3): 197-211
FAN Yujie，MENG Xiangzhen，PU Renhai，et al. Provenance analysis of Benxi Formation in the Yanchang exploration area of the Ordos Basin[J]. Bulletin of Geological Science and Technology，2025，44（3）：197-211 doi: 10.19509/j.cnki.dzkq.tb20240191
Citation: FAN Yujie，MENG Xiangzhen，PU Renhai，et al. Provenance analysis of Benxi Formation in the Yanchang exploration area of the Ordos Basin[J]. Bulletin of Geological Science and Technology，2025，44（3）：197-211 doi: 10.19509/j.cnki.dzkq.tb20240191
shu

Provenance analysis of Benxi Formation in the Yanchang exploration area of the Ordos Basin

doi: 10.19509/j.cnki.dzkq.tb20240191
  • 1.

    State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

  • 2.

    Natural Gas Research Institute Branch, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, 710061, China

  • 3.

    Gas Field Company, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Yan'an Shaanxi 716000, China

More Information
  • Author Bio:

    E-mail：2772451055@qq.com

  • Corresponding author: E-mail：purenhai@126.com
  • Received Date: 25 Apr 2024
  • Accepted Date: 07 Aug 2024
  • Rev Recd Date: 07 Aug 2024
    • Available Online: 07 Aug 2024
    Abstract
  • Objective

    The provenance of detritus plays a vital role in controlling the development and spatial distribution of the Benxi Formation sandstone reservoir within the Yanchang exploration area.

    Methods

    Based on previous research, this study employed four provenance analysis methods, including detrital zircon U-Pb ages, heavy mineral assemblages, trace elements, and statistical analysis of sandstone gravel size, applied to sand and mudstone samples from 37 wells in the Yanchang exploration area.

    Results

    The zircon U-Pb age populations exhibited peaks at approximately 1912 Ma and 2425 Ma, corresponding to the northern edge of the North China Craton. Additionally, peaks at 435−447 Ma and 952−976 Ma from five wells are linked to the North Qinling Mountains. Based on these findings, the provenance of sedimentary rocks can be divided into two primary directions: north and south. Furthermore, heavy mineral assemblage analysis showed higher zircon and tourmaline contents in the southwest region. At the same time, rutile was more abundant in the southeast, indicating that the southern source area can be subdivided into the southwest and southeast. Corresponding trace element analysis, notably the Zr/Nb values, supported these divisions, indicating two provenance directions of southwest Longdong and southeast Yuxi. Additionally, the spatial distribution of sandstone gravel diameters indicated a southeast source within the study area.

    Conclusion

    Comprehensive analysis reveals that the provenance of the Benxi Formation in the Yanchang exploration area stems from three main source regions: northeast (northern basin margin), southwest (Qilian Mountains), and southeast (North Qinling Mountains). The southeastern source is the closest and contributes the most sediments. This study illustrates the three provenance areas of the Benxi Formation and their influence zones, which are significant for predicting the distribution of sand bodies and delineating sedimentary facies in the Yanchang exploration area.

     

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