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Diagenesis and Its Influence to Porosity Evolution of Tongbomiao Formation in Beier Sag, Hailaer Basin

ZHANG Xin-tao1，2，LIU Li2，WEI Wen-yan3   

  1. 1.Faculty of Energy Resources,China University of Geosciences, Beijing 102249, China;2.College of Earth Sciences ,Jilin Uiniversity,Changchun 130061, China;3.Institute of Geological Science， Shengli Petroleum Administration,Dongying,Shandong 257015,China
  • Received:2007-04-05 Revised:1900-01-01 Online:2008-01-26 Published:2008-01-26
  • Contact: ZHANG Xin-tao

Abstract: The Tongbomiao Formation consists of pyroclastic, volcanic-sedimentary and terrigenous clastic rocks in Beier sag, Hailaer Basin. Diagenesis is mainly controlled by volcanic clastic materials in pyroclastic rocks, volcanic-sedimentary rocks. The main diagenesis includes compaction, cementation, corrosion and dissolution, etc. which belongs to stage A of middle diagenesis phase. The study of porosity evolution shows the compaction is the main cause resulting in the disappearance of primary porosity, and the next one is cementation. The losing of primary porosity by the early compaction and cementation reach over 83% totally, the later dissolution of rock fragment and feldspar adds to 6.53% porosity which improved reservoir effectively. However, the different types of rock’s diagenesis influence porosity greatly.

Key words: Hailaer Basin, Tongbomiao Formation, diagenesis, porosity evolution

CLC Number: 

  • P618.13
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