Diagenesis of braided fluvial sandstones and its implications for prediction of reservoir quality: a case study on the Neogene Shawan Formation, Junggar Basin, NW China

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• 作者：Penghui Zhang (1) (2)
  Jinliang Zhang (1)
  Yong Il Lee (2)
  Mingshui Song (3)
  Ming Zhang (1)
  Jingzhe Li (1)
  Fang Ding (1)
  Sainan Cheng (4)
  
  1. College of Resources Science & Technology ; Beijing Normal University ; Beijing ; 100875 ; China
  2. School of Earth and Environment Sciences ; Seoul National University ; Seoul ; 151-747 ; South Korea
  3. SINOPEC Shengli Oilfield Company ; Dongying ; 257100 ; China
  4. College of Geology and Prospecting Engineering ; Xinjiang University ; Urumqi ; 830049 ; China
  
• 关键词：Sandstone diagenesis ; Reservoir quality ; Depositional facies ; Chepaizi Uplift ; Junggar Basin
• 刊名：Arabian Journal of Geosciences
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：8
• 期：1
• 页码：29-37
• 全文大小：2,140 KB
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• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

This study states the spatial and temporal distribution of diagenetic alterations and their influence on reservoir quality in the lower member of Shawan sandstones of the Chepaizi Uplift in the Junggar Basin, NW China. Sandstones in this unit, which contains heavy oil, are composed of mostly lithic arkose deposited in a braided fluvial environment. The diagenetic processes that have affected the sandstones include mechanical compaction, cementation by carbonates, quartz, and clay minerals, and dissolution of framework grains and cements. Relatively good reservoir quality of the studied arkosic heavy oil reservoir rocks deposited in the braided fluvial environment occurs when feldspar, lithic fragments, and calcite cement experience dissolution in channel lag sandstones. However, the pervasive distribution of early carbonate cements mainly concentrated in braid bar deposits has resulted in a great reduction of reservoir quality. This study reveals that understanding of diagenetic evolution of braided fluvial sediments is helpful for providing a better elucidation and prediction of reservoir quality, and the results of this study can be applied to guide the direction for exploration and production of heavy oil.