Lithologic Reservoirs ›› 2010, Vol. 22 ›› Issue (1): 30-36.doi: 10.3969/j.issn.1673-8926.2010.01.006

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Diagenesis and porosity evolution of Xujiahe Formation in central Sichuan Basin

ZHANG Fugui， LIU Jiaduo，MENG Wanbin   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China
  • Online:2010-03-15 Published:2010-03-15

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Abstract:

The reservoir of Xujiahe Formation in central Sichuan Basin is a set of braided river deltaic sediments, which is comprised of feldspathic quartz sandstone, feldspathic Iitharenitc sandstone and lithic feldspathic sandstone. Based on core observation, combining with thin section observation, scanning transmission electron microscope and physical property, it is believed that the sandstone in the study area experienced four diageneses: compaction, cemcntation, mctasomasis and solution. The diagenetis stage can be divided into early diagenetic A and B stage and middle diagenetic A and B stage, and nowit is in the middle diagcnetic A-B stage, The diagenesis is a key factor for controlling the physical property in this area. Most primary pores were destructed after the diagenetic evolution, so it is mainly secondary pore.

Key words: fracture characteristic, conventional logging, fracture identification, Mahuangshan area

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