CSCD来源期刊

北大中文核心期刊

中国科技核心期刊

地学领域高质量科技期刊分级T2区（2023）

世界期刊影响力指数报告Q1区（2023）

Volume 43 Issue 4
Jul.  2024
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Article Contents
Article Navigation >  Bulletin of Geological Science and Technology  > 2024  >  43(4): 141-153
HUANG Jianhong, JIANG Wei, TAN Xianfeng, WU Songtao, CAI Xinyong, WU Kunyu, ZHANG Qinghui. Characteristics and exploration potential of shale oil reservoir in the Upper Member of the Xiaganchaigou Formation in the Ganchaigou area, western Qaidam Basin[J]. Bulletin of Geological Science and Technology, 2024, 43(4): 141-153. doi: 10.19509/j.cnki.dzkq.tb20230493
Citation: HUANG Jianhong, JIANG Wei, TAN Xianfeng, WU Songtao, CAI Xinyong, WU Kunyu, ZHANG Qinghui. Characteristics and exploration potential of shale oil reservoir in the Upper Member of the Xiaganchaigou Formation in the Ganchaigou area, western Qaidam Basin[J]. Bulletin of Geological Science and Technology, 2024, 43(4): 141-153. doi: 10.19509/j.cnki.dzkq.tb20230493
shu

Characteristics and exploration potential of shale oil reservoir in the Upper Member of the Xiaganchaigou Formation in the Ganchaigou area, western Qaidam Basin

doi: 10.19509/j.cnki.dzkq.tb20230493
  • 1a.

    Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang Gansu 736202, China

  • 1b.

    Plateau Saline Lacustrine Basin Oil-Gas Geology Key Laboratory of Qinghai Province, PetroChina, Dunhuang Gansu 736202, China

  • 2.

    Chongqing Key Laboratory of Complex Oil and Gas Exploration and Development, Chongqing 401331, China

More Information
  • Author Bio:

    HUANG Jianhong, E-mail: hjh1qh@petrochina.com.cn

  • Corresponding author: JIANG Wei, E-mail: weij2424@163.com
  • Received Date: 28 Aug 2023
  • Accepted Date: 12 Oct 2023
  • Rev Recd Date: 16 Sep 2023
    Abstract
  • Objective

    Well C902, located in the Ganchaigou area of the western Qaidam Basin, achieved a breakthrough in shale oil exploration as indicated by the high-production oil flow in the Ⅳ-Ⅵ layers of the Upper Member of the Palaeogene Xiaganchaigou Formation. However, ambiguities in evaluation criteria and resource potential limit the efficiency of shale oil development in the Upper Member of the Xiaganchaigou Formation in the Ganchaigou area.

    Methods

    Thus, the exploration potential of shale oil in the Ⅳ-Ⅵ layers of the Upper Member of the Xiaganchaigou Formation in the Ganchaigou area was comprehensively evaluated by comparing the lithology, physical properties, pore structure, and organic geochemistry between Well C902 and other wells.

    Results

    The complicated lithofacies of laminar/lamellar dolostone, laminar/lamellar limestone, laminar clay shale, and lamellar mudstone suggest the mixed carbonate and siliciclastic deposition of the Ⅳ-Ⅵ layers. The high brittleness index implies the good fracability of the Ⅳ-Ⅵ layers. The intergranular pores and laminar fractures, with a total proportion of 85% in the pore system, were dominant in the Ⅳ-Ⅵ layers that can be roughly classified as low-porosity and ultralow-permeability reservoirs. The organic matter, dominated by type Ⅰ-Ⅱ1, shows an average TOC content of more than 0.9% in the Ⅳ-Ⅵ layers. Both chloroform asphalt "A" and S1+S2 indicate a high hydrocarbon generation capacity.

    Conclusion

    Summarily, the widely deposited the Ⅳ-Ⅵ layers of the Upper Member of the Xiaganchaigou Formation have the characteristic of source-reservoir integration and show not only good quality of source rock but also strong fracability of the shale oil reservoir. The excellent source-reservoir-caprock assemblage is also widely developed, which ensures good sealing ability and favors improving oil and gas recovery after fracturing. This study can theoretically improve the development efficiency of shale oil in the Ganchaigou area.

     

    • The authors declare that no competing interests exist.
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