Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 23-32.doi: 10.12108/yxyqc.20250303

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics and main controlling factors of Triassic Chang 8 tight sandstone reservoir in Huanqing area，Ordos Basin

XIAO Wenhua, YANG Jun, YAN Baonian, WANG Jianguo, LI Shaoyong, MA Qilin, LI Zonglin, XUE Huanzhao   

  1. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China
  • Received:2024-07-22 Revised:2025-02-19 Published:2025-05-10

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Abstract: Based on the data of drilling，logging and core，the characteristics and formation mechanism of Triassic Chang 8 tight sandstone reservoir in Huanqing area of Ordos Basin were analyzed by thin section observation，mercury intrusion experiment，nuclear magnetic resonance，then the main controlling factors for enrichment of tight oil were clarified. The results show that：（1）Chang 8 tight sandstone reservoir in Huanqing area is mainly composed of lithic feldspar sandstone and feldspar lithic sandstone，with low compositional maturity （average 0.97）. The main reservoir space types are secondary pores，and intragranular pores and kaolinite intergranular pores can be seen . The porosity ranges from 5.50% to 12.60%，with an average value of 9.50%. The permeability ranges from 0.09 mD to 3.43 mD，with an average value of 0.79 mD. The reservoir is commonly of small pore throat radius，with an average pore throat radius of 0.12-0.16 um and the maximum pore throat radius of 0.49-0.62 μm. The high permeability is mainly contributed by the large pore throat.（2）The evolution about diagenetic and reservoir of Chang 8 reservoir in the study area are as follow. In the early diagenetic stage A，calcareous cemented tight sandstone was formed by injection of calcareous carbonate supersaturated pressure release water into sandy sediments，and the cementation was mainly calcite. In the middle diagenetic stage A，the organic acid fluid was injected into the tight sandstone along the hydrocarbon generation pressurized fracture to dissolve calcite cementation and feldspar detrital particles，and some of the reservoir space were formed.（3）The formation of Chang 8 tight oil reservoirs are controlled by slope background，high-quality source rocks，largescale distribution of river sand bodies and good source-reservoir configuration.The oil and gas are concentrated in the tight sandstone reservoirs close to the source rocks，and the sandstone with large thickness has a better oily content.

Key words: calcite cement, secondary pores, tight sandstone, near-source accumulation, Chang 8, Triassic, Huanqing area, Ordos Basin

CLC Number: 

  • TE122.2
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