Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 23-31.doi: 10.12108/yxyqc.20240103

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Fluid phase and hydrocarbon reservoir types of Permian Upper Urho Formation in Shawan Sag，Junggar Basin

WANG Jinduo1, ZENG Zhiping1, XU Bingbing2,3, LI Chao2, LIU Dezhi1, FAN Jie1, LI Songtao1, ZHANG Zengbao4   

  1. 1. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, Shandong, China
  • Received:2023-07-03 Revised:2023-07-28 Online:2024-01-01 Published:2024-01-02

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Abstract: There are abundant oil and gas resources in the super-deep strata of Shawan Sag in the hinterland of Junggar Basin. Thermal evolution simulation of source rocks was carried out to analyze the types of hydrocarbon generation products of source rocks of Permian Upper Urho Formation in Shawan Sag. Based on the experimental data of the high-temperature and high-pressure physical properties of the formation fluid, the formation fluid phase of well Zheng10 in Shawan Sag was studied by using phase diagram discrimination method and empirical parameter method. The results show that:(1) The oil and gas of Upper Urho Formation of well Zheng 10 in Shawan Sag mainly came from the argillaceous source rocks of Lower Urho Formation, with an organic matter type of Ⅱ1, a vitrinite reflectance(Ro) of 1.05% to 1.46%, and a rock pyrolysis peak temperature(Tmax) of 433℃ to 446℃. It is in the mature to high mature evolution stage and currently in the stage of light oil generation.(2) The fluid composition of the Upper Urho Formation is conforming to the fluid composition of condensate gas reservoir, with a formation temperature of 166.0℃, which is between the critical temperature and the critical condensate temperature. The formation pressure is 155 MPa, much higher than the dew-point pressure, with a large surface and dew-point pressure difference, indicating that the fluid exhibits condensate gas phase characteristics under formation conditions, but there are certain differences between the underground oil and gas phase state and the surface produced fluid phase state. Both the phase diagram discrimination method and the empirical parameter method show that the gas reservoirs of Upper Urho Formation in well Zheng 10 are condensate gas reservoirs with a large oil-ring.(3) The Upper Urho Formation in Shawan Sag has superior hydrocarbon accumulation conditions, adjacent to the source rocks of Lower Urho Formation. Oil and gas are transported vertically near the source, migrating and accumulating towards local uplift areas. The thick Triassic and regional cap rocks of the upper part of Upper Urho Formation play an important sealing role, ultimately forming lithologic-structural condensate gas reservoirs in local uplift areas.

Key words: hydrocarbon phase, ultra-deep layer, condensate gas reservoirs, near-source accumulation, Upper Urho Formation, well Zheng 10, Permian, Shawan Sag, Junggar Basin

CLC Number: 

  • TE122.1
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