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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2018  >  40(2): 133-140
GAO Hui, HE Mengqing, ZHAO Pengyun, DOU Liangbin, WANG Chen. Comparison of geological characteristics of Chang 7 shale oil in Ordos Basin and typical shale oil in North America[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(2): 133-140. doi: 10.11781/sysydz201802133
Citation: GAO Hui, HE Mengqing, ZHAO Pengyun, DOU Liangbin, WANG Chen. Comparison of geological characteristics of Chang 7 shale oil in Ordos Basin and typical shale oil in North America[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(2): 133-140. doi: 10.11781/sysydz201802133
shu

Comparison of geological characteristics of Chang 7 shale oil in Ordos Basin and typical shale oil in North America

doi: 10.11781/sysydz201802133
  • 1.

    School of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

  • 2. Engineering Research Center of Developmentand Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

  • 3. No. 11 Oil Production Plant of Changqing Oilfield Company, PetroChina, Qingyang, Gansu 745000, China

  • 4. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

  • Received Date: 2017-10-13
  • Rev Recd Date: 2018-01-18
  • Publish Date: 2018-03-28
    Abstract
  • The Chang 7 shale oil in the Yanchang Formation of Ordos Basin was studied using X-ray diffraction, scanning electron microscopy, high pressure mercury penetration, and gas isothermal adsorption. The formation was compared with typical shale oil in North America from four aspects including geological conditions, source rock characteristics, mineral composition, and reservoir space types. The results showed that both the Chang 7 shale oil and the typical shale oil in North America were deposited in a low energy environment, and the stable sedimentary environment was beneficial to shale oil accumulation. The organic matter type and maturity of source rocks in Chang 7 and North America are similar. The TOC content of Chang 7 shale oil is 2% to 18%, which is higher than that of the Eagle Ford shale. Thus, the Chang 7 source rocks are considered to have a great potential for oil production. The brittle mineral content of Chang 7 shale oil is 69.73%, only 1.27% lower than the typical shale oil in North America, indicating that the shale of Chang 7 formation is amenable to fracturing. Compared with the typical shale oil in North America, the Chang 7 shale oil has poor porosity and permeability (0.5%-2.1% and (0.000 4-0.03)×10-3 μm2, respectively). Micro-cracks and organic pores were well developed in typical shale oil in North America, while the organic pores in Chang 7 shale oil are scattered, and the reservoir space is mainly composed of intergranular pores, intragranular pores and micro-cracks. It can be concluded that the Chang 7 shale oil has the same oil accumulation pattern and mineral composition as the typical shale oil in North America. However, the Chang 7 shale oil has poor physical properties and a dense reservoir. Therefore, it has great resource potential and high development difficulty.

     

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