Lithologic Reservoirs ›› 2010, Vol. 22 ›› Issue (2): 32-36.doi: 10.3969/j.issn.1673-8926.2010.02.006

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Accumulation mechanism of composite reservoir of Upper Triassic Yanchang Formation in northwestern Ordos Basin

LI Yuanhao 1，2， ZHANGMingji3，WANG Xiujuan4， DU Yuguo 1，2   

  1. (1．ResearchInstitute ofExploration andDevelopment，ChangqingOi~ ldCompany，PetroChina，Xi’all 710018，China； 2．State Engineering Laboratory ofLow Permeability Oil and Gas Field Exploration and Development，Xi’an 7 1001 8，China； 3．ChangqingExploration Department，Bureau ofGeophysical Prospecting，China National Petroleum Corporation， Xi’an 710018，China；4 Reservoir Description Department，Changqing Oitfield Company，PetroChina，Xi’an 710018，China
  • Online:2010-06-15 Published:2010-06-15

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Abstract:

The Yanehang Formation in northwestern Ordos Basin is one of the most important exploration area which mainly developed lacustrine delta deposition．The Chang 7 oil shale is the source rock which produced high pressure during the main period of hydrocarbon generation．The overpressure is the main dynamic force for the oil migration to the low perm eability reservoirs through microfraetures faults and superposed sands．The Chang 7 sourae rock is characterized by continuous hydrocarbon-generation，episodic hydrocarbon expulsion and muhipoint injection．The source rocks firstly expeHed down to the lower reservoirs and then to the upper reservoirs according to the homogenization temperature and diagenesis and the secondary migration is mainly vertical and short lateral migration．The thickness of downward expulsion is 10 meter and the upper is 30 meter．The ratio of the upper and down hydrocarbon expulsion amount ofchang 7 is about 3:1．

Key words: coherence analysis, edge preserving smoothing, fault detection

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[1] ZHAO Yan，HE Zhenhua，HUANG Deji. Application of edge preserving smoothing to the calculation of seismic coherence cube [J]. Lithologic Reservoirs, 2010, 22(2): 95-98.
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