Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 133-144.doi: 10.12108/yxyqc.20240513

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and reservoir control of source rocks of Triassic Chang 7 member in Qingcheng area，Ordos Basin

WANG Zixin1,2,3, LIU Guangdi3, YUAN Guangjie1,2, YANG Henglin1,2, FU Li1,2, WANG Yuan1,2, CHEN Gang1,2, ZHANG Heng1,2   

  1. 1. CNPC Engineering Technology R & D Company Limited, Beijing 102206, China;
    2. National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Beijing 102206, China;
    3. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2023-04-19 Revised:2023-05-22 Online:2024-09-01 Published:2024-09-04

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Abstract: The Chang 7 member of Triassic in Ordos Basin is a key research area for shale oil. Through the determination of total organic carbon，chloroform extraction，rock pyrolysis，XRD whole rock mineral analysis，and scanning electron microscopy observation，the characteristics of source rocks of Triassic Chang 7 member in Qingcheng area of Ordos Basin were analyzed. A three-dimensional electrical logging model of organic carbon and logging curves was established by using multiple regression linear method，clarifying the spatial distribution characteristics of the source rocks and their reservoir control effects. The results show that：（1）The average TOC values of shale samples from Chang 71，Chang 72 and Chang 73 submembers in Qingcheng area of Ordos Basin are 5.01%， 6.04% and 6.76%，respectively，and the average values of chloroform bitumen “A” are 0.63%，0.67% and 0.73%，respectively. The overall organic matter types are mainly type Ⅱ1 and type Ⅱ2，which are in mature to high-mature stage. The oil content and mobility are good，reaching a good to excellent source rock level.（2）The shale samples are mainly composed of quartz feldspar and clay minerals. The pore types are mainly primary intergranular pores，intercrystalline pores and constricted fissures in organic matters，but the pore size distribution of each sample is different.（3）The lower limit of TOC in source rocks in the study area is 1.50%. The 72 submember near Qingcheng area and the 73 submember near Qingcheng and Huanxian areas are the main effective source rock development areas.（4）The TOC content and spatial distribution characteristics of effective source rocks affect the oil content of shale reservoirs，and the TOC content directly determines the level of oil production.

Key words: shale oil, multiple regression, organic carbon prediction, source rock distribution, mature to high-mature stage, Chang 7 member, Triassic, Qingcheng area, Ordos Basin

CLC Number: 

  • TE122.2
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