Diagenesis and diagenetic facies of reservoir rocks of Majiagou Formation in southern Jingbian tableland, Ordos Basin

  • WEI Qinlian ,
  • ZHENG Rongcai ,
  • XIAO Ling ,
  • MA Guofu ,
  • DOU Shijie ,
  • TIAN Baozhong
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  • 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Jingzhou 434023, China; 2. School of Geophysics and Oil Resources, Yangtze University, Jingzhou 434023, China

Online published: 2009-03-16

Abstract

Majiagou Formation is an important Ordovician gas-bearing formation in Ordos Basin. The diagenesis types and the petrogenetic conditions of carbonate rocks of Majiagou Formation in southern Jingbian tableland are studied. The result shows that dolomitisation, ancient karstification and cemented metasomatism are dominated factors for the reservoir. According to various diagenesis characteristics and paragenetic sequence relations, it is concluded that this set of carbonate rocks mainly experienced four diagenetic stages: penecontemporaneous diagenetic stage, epidiagenetic stage, early diagenetic stage and anadiagenetic stage, and at present, it reached the later period of anadiagenetic stage. Based on the research of the diagenesis and combinatory sequence, the diagenetic facies is studied, and it is roughly divided into three diagenetic facies, including hypergene ancient karst-early filling cementation diagenetic facies, hypergene ancient karst-buried ancient karst diagenetic facies and buried cementation diagenetic facies. Hypergene ancient karst-buried ancient karst diagenetic facies has the best reservoir quality. Based on the studies on the influencing factors, the plane distribution of the diagenetic facies is definited, which provides foundations for reservoir evaluation and prediction.

Cite this article

WEI Qinlian , ZHENG Rongcai , XIAO Ling , MA Guofu , DOU Shijie , TIAN Baozhong . Diagenesis and diagenetic facies of reservoir rocks of Majiagou Formation in southern Jingbian tableland, Ordos Basin[J]. Lithologic Reservoirs, 2009 , 21(1) : 27 -33 . DOI: 10.3969/j.issn.1673-8926.2009.01.006

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