| Citation: | FAN Yujie，MENG Xiangzhen，PU Renhai，et al. Provenance Analysis of Benxi Formation in Yanchang Exploration Area of Ordos Basin[J]. Bulletin of Geological Science and Technology，2025，44（3）：1-15 doi: 10.19509/j.cnki.dzkq.tb20240191
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The provenance of detritus is a crucial factor in controlling the development and distribution of the Benxi Formation sandstone reservoir in the Yanchang exploration area.
Based on previous research, this study employed four methods for the provenance study of the Benxi Formation, including detrital zircon U-Pb ages, heavy mineral assemblages, trace elements, and sandstone gravel size statistical analysis, on sand and mudstone samples from 37 wells in the Yanchang exploration area.
The results show that zircon age populations with peaks at
Comprehensive analysis concludes that the Benxi Formation in the Yanchang exploration area can be categorized into three prmary source areas: northeast, southwest, and southeast. These sources correspond to erosion areas along the northern margin of the basin, the southern margin of the Qilian Mountains, and the eastern section of the North Qinling Mountains, respectively. The southeast source area is closest to the Yanchang exploration area and contributes more sediments than other source terranes. This study illustrates the three provenance areas of the Benxi For Mation 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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