Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (5): 94-103.doi: 10.12108/yxyqc.20260509

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Reservoir characteristics and main controlling factors of interlayered shale oil in Triassic Chang 7 member of Tiebiancheng area， Ordos Basin

ZHANG Weigang1(), LIU Guanglin2(), WANG Yong1, NING Fan1, MA Shaohui2, YAN Baiquan2   

  1. 1 No. 8 Oil Production Plant， Changqing Oilfield Company， PetroChina， Xi’an 710021， China
    2 NEPU Sanya Offshore Oil & Gas Research Institute， Hainan 572025， Sanya， China
  • Received:2026-03-22 Revised:2026-05-06 Online:2026-09-01 Published:2026-09-04
  • Contact: LIU Guanglin E-mail:2957617668@qq.com;89409960@qq.com

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Abstract:

Taking interlayered shale oil reservoirs of Triassic Chang 7 member in Tiebiancheng area of Ordos Basin as the research object， reservoir sedimentary characteristics， petrology features and pore characteristics were analyzed based on core observation， thin section and scanning electron microscope analysis， physical property testing， CT scanning， mercury injection capillary pressure measurement. By discussing the differential control effects of diagenesis on reservoir densification under different sedimentary settings and the influence of physical properties on oil-bearing capacity， the main controlling factors of reservoir “sweet spots”were clarified. The results show that：（1） Chang 7 member reservoirs in Tiebiancheng area are mainly developed sedimentary microfacies such as delta front subaqueous distributary channel， mouth bar and interdistributary bay. Reservoir lothologies are mainly feldspathic sandstone and lithic feldspathic sandstone, with feldspar and quartz as the dominant mineral components， accounting for 64.99% of the total mineral composition. The content of interstitial materials is high， dominated by carbonate cements and clay minerals， and the total volume fraction of matrix and cements is 16.15%. （2） The total areal porosity of reservoir in the study area is 2.55%， indicating an overall low development degree. Intergranular pores and feldspar dissolved pores serve as the dominant pore types， with areal porosities of 1.11% and 1.10%， respectively. The pore radii mainly range from 3 μm to 18 μm， and throat radii are mostly 0.3-15.0 μm， dominated by fine throats， and connected pores volume fraction is 81.88%. Reservoirs have an average porosity of 7.5% and an average permeability of 0.15 mD， belonging to tight reservoirs. （3） The densification degree of Chang 7 reservoirs in the study area is jointly controlled by sedimentation and diagenesis. Sedimentary environments govern the primary mineral composition， grain texture and initial physical properties of reservoirs， while diagenesis determines reservoir densification degree and reservoir capacity. Oil-bearing capacity is controlled by physical properties. The central parts of thick sandbodies formed by superimposed subaqueous distributary channels and mouth bars are favorable “sweet spot” intervals.

Key words: interlayered shale oil, reservoir characteristics, diagenesis, sweet spot, Chang 7 member, Yanchang Formation, Tiebiancheng area, Ordos Basin

CLC Number: 

  • TE122.23

Fig. 1

Tectonic location of Tiebiancheng area （a） and comprehensive stratigraphic column of Middle Triassic Yanchang Formation （b）， Ordos Basin"

Fig. 2

Typical sedimentary structures of the interlayered shale oil reservoir in Middle Triassic Chang 7 member of Tiebiancheng area， Ordos Basin"

Fig. 3

Ternary diagram of rock mineral composition of Middle Triassic Chang 7 member inTiebiancheng area，Ordos Basin"

Fig. 4

Histogram of interstitial material content of Middle Triassic Chang 7 member in Tiebiancheng area， Ordos Basin"

Fig. 5

Microscopic characteristics of reservoirs in Middle Triassic Chang 7 member of Tiebiancheng area，Ordos Basin"

Fig. 6

Histogram of different pore types of Middle Triassic Chang 7 member in Tiebiancheng area, Ordos Basin"

Fig. 7

Mercury intrusion curves characteristics of 3 types of reservoirs in Middle Triassic Chang 7 member of Tiebiancheng area， Ordos Basin"

Fig. 8

Pore connectivity model （a） and pore-throat ball-and-stick model （b） of Middle Triassic Chang 7 member in Tiebiancheng area， Ordos Basin"

Fig. 9

Pore-throat radii distribution of Middle Triassic Chang 7 member in Tiebiancheng area， Ordos Basin"

Fig. 10

Contour maps of porosity （a） and permeability （b） of Middle Triassic Chang 72 submember in Tiebiancheng area， Ordos Basin"

Fig. 11

Characteristics of sandbodies of different genesis of Triassic Chang 72 submember in well Y264 of Tiebiancheng area， Ordos Basin"

Fig. 12

Scatter regression plots of oil saturation with porosity （a） and permeability （b） of Middle Triassic Chang 7 member in Tiebiancheng area， Ordos Basin"

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