Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (1): 69-74.doi: 10.3969/j.issn.1673-8926.2013.01.014

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Diagenesis of Chang 6 reservoir of Upper Triassic in Jiyuan area,Ordos Basin

CHENG Jun1， LI Hong2， LEI Chuan2   

  1. 1. Shaanxi Institute of Regional Geological Survey and Mineral Resources， Xianyang 712000， China； 2. State Key Laboratory of Continental Dynamics， Northwest University， Xi’an 710069， China
  • Online:2013-02-20 Published:2013-02-20

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Abstract:

The Chang 6 reservoir of Upper Jurassic in Jiyuan area is characterized by poor physical properties, complicated diagenesis, strong heterogeneity and low permeability. Based on the analysis of cast thin section, cathode luminescence and scanning electronic microscope, the diagenesis of Chang 6 reservoir was studied. The result shows that sandstone reservoirs in this area are mainly composed of fine lithic arkose and feldspathic sandstone, mainly developed intergranular pores and intragranular dissolved pores, mainly experienced compaction, cementation, dissolution and metasomatism, and the diagenetic evolution reached the middle diagenetic stage A. The diagenesis of Chang 6 reservoir is the main controlling factor for reservoir properties. This study can provide basic data and guidance for the oil and gas exploration and development in this area.

Key words: velocity potential, square inverted nine-spot well pattern, threshold pressure gradient, water flooding reserves

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