Science in China Series D: Earth Sciences

, Volume 45, Issue 7, pp 616–634 | Cite as

Reconstruction of the diagenesis of the fluvial-lacustrinedeltaic sandstones and its influence on the reservoir quality evolution

—Evidence from Jurassic and Triassic sandstones, Yanchang Oil Field, Ordos Basin
  • Jinglan Luo
  • S. Morad
  • Xiaoli Zhang
  • Shike Yan
  • Fuli Wu
  • Yuhong Li
  • Junmin Xue


The reservoir quality of Jurassic and Triassic fluvial and lacustrine-deltaic sandstones of the Yanchang Oil Field in the Ordos Basin is strongly influenced by the burial history and facies-related diagenetic events. The fluvial sandstones have a higher average porosity (14.8%) and a higher permeability (12.7 × 10−3 μm2) than those of the deltaic sandstones (9.8% and 5.8 ×10−3) μm2, respectively). The burial compaction, which resulted in 15% and 20% porosity loss for Jurassic and Triassic sandstones, respectively, is the main factor causing the loss of porosity both for the Jurassic and Triassic sandstones. Among the cements, carbonate is the main one that reduced the reservoir quality of the sandstones. The organic acidic fluid derived from organic matter in the source rocks, the inorganic fluid from rock-water reaction during the late diagenesis, and meteoric waters during the epidiagenesis resulted in the formation of dissolution porosity, which is the main reason for the enhancement of reservoir-quality.


Yanchang Oil Field Jurassic and Triassic fluvial lacustrine-deltaic sandstone diagenesis reservoir-quality evolution 


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Copyright information

© Science in China Press 2002

Authors and Affiliations

  • Jinglan Luo
    • 1
  • S. Morad
    • 2
  • Xiaoli Zhang
    • 1
  • Shike Yan
    • 3
  • Fuli Wu
  • Yuhong Li
  • Junmin Xue
    • 3
  1. 1.Key Laboratory for Continental Dynamics, Ministry of Education of ChinaDepartment of Geology, Northwest UniversityXi’anChina
  2. 2.Department of Earth SciencesUppsala UniversitySweden
  3. 3.Yanchang Petroleum Administration BureauYongpingChina

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