Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (4): 957-967.doi: 10.13278/j.cnki.jjuese.20180260

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Mechanism of Strong Calcium Cementation in Tight Sandstone and Its Significance:A Case Study on Triassic Chang 7 Oil Formation of Yanchang Formation in Ordos Basin

Cui Jingwei, Zhu Rukai   

  1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2018-10-11 Published:2020-07-29
  • Supported by:
    Supported by National Science and Technology Major Project (2017ZX05001-001)

Abstract: Based on core and thin section observation, fluorescence microscope, cathode luminescence microscope, isotope mass spectrometer, and heating/freezing stage, the strong calcareous cementation sandstone and its nearby oil-bearing sandstone of Chang 7 oil formation in Ordos basin were studied. Thin section observation indicates that calcite cementation is the main factor that causes oil-bearing heterogeneity in tight sandstone reservoir, and the majority of cementation occurs at the same period. The result of clumped isotope of the calcite shows that the formation temperature is from 18 to 42 ℃. The corresponding geological period is from the Middle and Late Triassic to Middle Jurassic, a product of early diagenesis related to the early small scale tectonic movement of the basin. The homogenization temperature of the saltwater inclusions associated with oil and gas inclusions is from 90 to 120 ℃, which means that the time of oil filling is Early Cretaceous. In Chang 7 oil Formation, the formation time of the calcareous cement in the non oil tight sandstone is earlier than the oil filling time in the oil-bearing sandstone.

Key words: tight sandstone, heterogeneity, calcite cementation, clumped isotope, Ordos basin

CLC Number: 

  • TE122
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