Mineral characteristics and their geological significance of black shales in southeastern Ordos Basin by X-ray diffraction analysis

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• 作者：Zhigang Yao (1)
  Yang Yang (1)
  Huawei Ying (1)
  Yunpeng Dong (1)
  
• 关键词：mineral composition ; shale gas/oil ; southeastern Ordos Basin
• 刊名：Chinese Journal of Geochemistry
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：33
• 期：1
• 页码：119-124
• 全文大小：402 KB
• 作者单位：Zhigang Yao (1)
  Yang Yang (1)
  Huawei Ying (1)
  Yunpeng Dong (1)
  
  1. School of Earth Sciences and Engineering, Xi鈥檃n Petroleum University, Xi鈥檃n, 710065, China
  
• ISSN：1993-0364

文摘

X-ray diffraction analysis of black shale of Upper Triassic Member Chang 7 of the Yanchang Formation in southeastern Ordos Basin showed that black shales were deposited in brackish, strongly reducing, semi-deep-deep lacustrine facies, and mainly composed of quartz, feldspar, carbonate (dolomite), clay minerals (illite and illite/smectite) and a certain amount of pyrite. The mineral composition characteristics of this set of black shales are similar to those of highly productive shale gas in North America, for example shallow burial, low clay mineral and abundant brittle mineral, so the strata are conducive to the development of cracks and fractures. Thus, this area is favorable for shale oil/gas exploration and development.