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Volume 45 Issue 5
Sep.  2023
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2023  >  45(5): 952-962
LI Zhiming, JIN Yunyun, LI Chuxiong, HUANG Shuaibo, ZHOU Yuanyuan, JIA Mengyao, LENG Junying, YU Mengli, XU Ershe, LIU Yahui, LIU Peng, HE Jinyi. Discussion on shale oil enrichment pattern in the Ⅲ submember of the third member of Oligocene Hetaoyuan Formation, Biyang Sag, Nanxiang Basin: a case study of cored interval of well YYY1 in the central deep sag zone[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(5): 952-962. doi: 10.11781/sysydz202305952
Citation: LI Zhiming, JIN Yunyun, LI Chuxiong, HUANG Shuaibo, ZHOU Yuanyuan, JIA Mengyao, LENG Junying, YU Mengli, XU Ershe, LIU Yahui, LIU Peng, HE Jinyi. Discussion on shale oil enrichment pattern in the Ⅲ submember of the third member of Oligocene Hetaoyuan Formation, Biyang Sag, Nanxiang Basin: a case study of cored interval of well YYY1 in the central deep sag zone[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(5): 952-962. doi: 10.11781/sysydz202305952
shu

Discussion on shale oil enrichment pattern in the Ⅲ submember of the third member of Oligocene Hetaoyuan Formation, Biyang Sag, Nanxiang Basin: a case study of cored interval of well YYY1 in the central deep sag zone

doi: 10.11781/sysydz202305952
  • 1.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • 2.

    State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development, Wuxi, Jiangsu 214126, China

  • 3.

    SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China

  • 4.

    Research Institute of Exploration and Development, SINOPEC Henan Oilfield Company, Nanyang, Henan 473043, China

  • Received Date: 2023-06-05
  • Rev Recd Date: 2023-08-18
  • Publish Date: 2023-09-28
    Abstract
  • The third member of Oligocene Hetaoyuan Formation (Eh3) in Biyang Sag of Nanxiang Basin is the first strata in which a breakthrough for continental shale oil exploration is made, but scale development has not been realized due to a variety of factors. In order to reveal the target zone of shale oil exploration and development of the third member of Hetaoyuan Formation in the central deep sag zone of Biyang Sag, a case study on the cored interval of the Ⅲ submember of the third member of Hetaoyuan Formation (Eh33) from shale oil risk exploration well YYY1 is carried out. Systematic studies on the lithofacies types and the characteristics of shale oil enrichment intervals of the cored interval of Eh33 are carried out and the shale oil enrichment pattern and preferred target layers of shale oil exploration and development are defined by taking full advantage of the results of field analysis and combining with previous research results. The findings have shown that seven lithofacies types, i.e. organic laminar mixed shale, organic-rich laminar mixed shale, organic laminar felsic shale, organic-rich laminar felsic shale, organic layered felsic shale and organic massive argillaceous siltstone/siltstone, organic massive fine sandstone, are developed in the middle-lower interval of Eh33 of well YYY1. Eight shale oil enrichment intervals are identified according to two key parameters of free hydrocarbon (S1) and oil saturation index (OSI) and combining with the total porosity of nuclear magnetic logging. The thickness of a single shale oil enrichment interval is 5-20 m and the total thickness is 81 m. The shale oil enrichment intervals developed in the middle interval of Eh33 are all controlled by both in-situ retention hydrocarbon and migration hydrocarbon from the adjacent high TOC layer, with two enrichment patterns: source-reservoir integration and source-reservoir coexistence. The shale oil enrichment intervals developed in the lower interval of Eh33 are all controlled by in-situ retention hydrocarbon, with source-reservoir integration enrichment pattern. The shale oil enrichment interval in the middle interval is defined the preferred target interval for shale oil exploration and development in Eh33 in the central deep sag zone of Biyang Sag. This provides an important basis for shale oil exploration and development in Biyang Sag.

     

    • All authors disclose no relevant conflict of interests.
    LI Zhiming and JIN Yunyun drafted and revised the manuscript.LI Chuxiong, HUANG Shuaibo, ZHOU Yuanyuan, LENG Yunying, YU Mengli, LIU Yahui and LIU Peng participated in data collation and analysis.HUANG Shuaibo，JIA Mengyao, YU Mengli, XU Ershe and LIU Yahui drew the diagrams. JIA Mengyao and HE Jinyi participated in drafting the manuscript. All the authors have read the last version of paper and consented for submission.
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