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Volume 43 Issue 6
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2021  >  43(6): 1031-1037
LÜ Yanping, LÜ Jing, XU Xiangdong, DENG Guangxiao, LIU Yongli, LIU Cunge, ZHANG Zhenzhe, HAN Yongqiang. Genetic mechanism of inner reservoirs of Yingshan Formation of Middle-Lower Ordovician in Tahe Oil Field, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(6): 1031-1037. doi: 10.11781/sysydz2021061031
Citation: LÜ Yanping, LÜ Jing, XU Xiangdong, DENG Guangxiao, LIU Yongli, LIU Cunge, ZHANG Zhenzhe, HAN Yongqiang. Genetic mechanism of inner reservoirs of Yingshan Formation of Middle-Lower Ordovician in Tahe Oil Field, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(6): 1031-1037. doi: 10.11781/sysydz2021061031
shu

Genetic mechanism of inner reservoirs of Yingshan Formation of Middle-Lower Ordovician in Tahe Oil Field, Tarim Basin

doi: 10.11781/sysydz2021061031
  • 1.

    Research Institute of Petroleum Exploration and Production, Northwest Oilfield Branch Company, SINOPEC, Urumqi, Xinjiang 830011, China

  • 2.

    CNOOC International Ltd., Beijing 100028, China

  • 3.

    Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China

  • 4.

    College of Petroleum Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China

  • 5.

    Xinjiang Bota Oilfield Technical Service Co., Ltd., Korla, Xinjiang 841000, China

  • Received Date: 2020-09-30
  • Rev Recd Date: 2021-10-11
  • Publish Date: 2021-11-28
    Abstract
  • The fracture-cave reservoirs of weathering crust on the top of Middle-Lower Ordovician in the Tahe Oil Field of Tarim Basin are the major production layer, and large scale reservoirs are also developed underneath the reservoirs. In order to discuss the genetic mechanism of formation of these reservoirs, carbon and oxygen isotope, strontium isotope, rare earth elements and cathodoluminescence were tested in the well A area. The δ18O and δ13C values of calcite in caves and structural fractures are obviously negative than those in limestone background. The mean value of δ18OPDB is -14.74‰, showing a trend of constant δ18O and variable δ13C, which are the calcite lines of atmospheric water formed by degassing. The 87Sr/86Sr ratios of calcites from caves and structures range from 0.709 622 to 0.709 968, which are obviously higher than the background values, and are mainly affected by crustal strontium. There are no positive anomalies in Ce and Eu elements, indicating that there is no hydrothermal fluid involved. The cathodoluminescence of calcites are mainly orange and dark brown, which represents weak oxidation-reduction environment. The results showed that the fracture-cave reservoirs of the Midde-Lower Ordovician Yingshan Formation in the well A area were formed in the deep slow flow zone of atmospheric water during the Early Hercynian, showing the characteristics of pressure bearing, slow flow and not controlled by the karst drainage base level.

     

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