Volume 43 Issue 1
Jan.  2024
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ZHANG Xinle, PING Hongwei, YANG Xin, CHEN Honghan, LI Chuanquan, HE Faqi, QI Rong. Comparison of hydrocarbon generation, expulsion periods, and accumulation periods of source rocks in Member 7 of the Yanchang Formation in the Jinghe Oilfield, southern Ordos Basin[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 108-121. doi: 10.19509/j.cnki.dzkq.tb20220409
Citation: ZHANG Xinle, PING Hongwei, YANG Xin, CHEN Honghan, LI Chuanquan, HE Faqi, QI Rong. Comparison of hydrocarbon generation, expulsion periods, and accumulation periods of source rocks in Member 7 of the Yanchang Formation in the Jinghe Oilfield, southern Ordos Basin[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 108-121. doi: 10.19509/j.cnki.dzkq.tb20220409

Comparison of hydrocarbon generation, expulsion periods, and accumulation periods of source rocks in Member 7 of the Yanchang Formation in the Jinghe Oilfield, southern Ordos Basin

doi: 10.19509/j.cnki.dzkq.tb20220409
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  • Author Bio:

    ZHANG Xinle, E-mail: xinle.zhang@qq.com

  • Corresponding author: PING Hongwei, E-mail: howping@qq.com
  • Received Date: 26 Jul 2022
  • Accepted Date: 30 Nov 2022
  • Rev Recd Date: 25 Nov 2022
  • Objective

    Commercial oil accumulation in the Jinghe Oilfield of the Southwest Ordos Basin was primarily found in the Northeast area. Previous studies have shown that oil mainly sourced from the oil shale in Member 7 of the Yanchang Formation. However, whether the oil comes from the source rocks spatially located in the Jinghe Oilfield or the basin center has not been determined, which inhibits further exploration of the Jinghe Oilfield.

    Methods

    In this paper, the hydrocarbon generation and expulsion history of source rocks in Member 7 of the Yanchang Formation in different tectonic parts of the Jinghe Oilfield and in the basin center have been reconstructed through basin simulation. Then, the accumulation periods of oil in the Yanchang Formation reservoir have been identified using fluid inclusion technology.

    Results

    The time window comparison of the oil accumulation in reservoir and the hydrocarbon generation and expulsion of source rocks show that oil in the Jinghe Oilfield limitedly came from the source rocks beneath the Jinghe Oilfield but more widely came from source rocks in the basin center. The oil in the Jinghe Oilfield generally shows the migration direction from Northeast to Southwest.

    Conclusion

    Therefore, unlike the traditional model of short-distance vertical migration, a new model can be established as that, the oil in the Jinghe Oilfield mainly laterally migrated from the hydrocarbon kitchen in the basin center along the strike-slip fault belt. The research results can provide an important reference for the prediction of hydrocarbon accumulation zones in the Jinghe Oilfield.

     

  • The authors declare that no competing interests exist.
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