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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

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Abstract

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.

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Authors and Affiliations

  1. Key Laboratory for Continental Dynamics, Ministry of Education of China, Department of Geology, Northwest University, 710069, Xi’an, China

    Jinglan Luo & Xiaoli Zhang

  2. Department of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden

    S. Morad

  3. Yanchang Petroleum Administration Bureau, 717208, Yongping, China

    Shike Yan & Junmin Xue

Authors
  1. Jinglan Luo
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  2. S. Morad
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  3. Xiaoli Zhang
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  4. Shike Yan
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  5. Fuli Wu
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  6. Yuhong Li
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  7. Junmin Xue
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Correspondence to Jinglan Luo.

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Luo, J., Morad, S., Zhang, X. et al. Reconstruction of the diagenesis of the fluvial-lacustrinedeltaic sandstones and its influence on the reservoir quality evolution. Sci. China Ser. D-Earth Sci. 45, 616–634 (2002). https://doi.org/10.1360/02yd9063

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  • DOI: https://doi.org/10.1360/02yd9063

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