Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 66-75.doi: 10.12108/yxyqc.20230306

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and genesis of Upper Triassic Chang 8 reservoir with low oil saturation in northern Pingliang area， Ordos Basin

BAI Yang1,2, ZHANG Xiaolei3, GANG Wenzhe1,2, ZHANG Zhongyi3, YANG Shangru4, PANG Jinlian3, CAO Jingjing1,2, HOU Yunchao3   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. Research Institute of Oil and Gas Technology, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2022-07-25 Revised:2022-08-15 Published:2023-04-25

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Abstract: Through core physical property analysis， constant pressure mercury injection and nuclear magnetic resonance testing，combined with oil source and structure，the characteristics and genesis of Upper Triassic Chang 8 reservoir with low oil saturation in northern Pingliang area of Ordos Basin were analyzed. The results show that： （1）The oil saturation of Upper Triassic Chang 8 reservoir is generally less than 20%， while the water saturation is generally greater than 50%. It is a typical low oil saturation reservoir with low single well production and poor oil-water difference. The reservoir is sporadically distributed at the top of Chang 8 member.（2）Insufficient hydrocarbon supply is the fundamental reason for the low oil saturation of the reservoirs in the study area. It is an allochthonous oil reservoir in well M53 well，and the long distance of hydrocarbon supply leads to insufficient hydrocarbon supply. It is in-situ hydrocarbon accumulation in well Y80， and the small amount of hydrocarbon expulsion from in-situ source rocks results in insufficient oil and gas filling.（3） Affected by low-amplitude structures，vertical and lateral migration power is insufficient in well M53 well. The strong physical heterogeneity of the reservoirs in the whole area， the relatively developed micro pore throats in the pore structure， and the high percentage of bound water，resulted in low saturation after oil and gas displacement of movable water，which indirectly led to scattered distribution and low oil saturation of the reservoirs in northern Pingliang area.（4）The reservoirs with good physical property at the structural high point in the southwestern Shangxinzhuang area in M53 well area are important targets for the next step of increasing reserves and production.

Key words: low oil saturation, oil and gas charging, hydrocarbon supply distance, bound water, movable water, Chang 8 reservoir, Upper Triassic, northern Pingliang area, Ordos Basin

CLC Number: 

  • TE122.2
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