Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (2): 49-54.doi: 10.3969/j.issn.1673-8926.2013.02.008

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Reservoir characteristics and formation mechanism of Lower Permian Shan 2 member in northern Zizhou area, Ordos Basin

XU Xing 1，2， LI Wenhou 1，2   

  1. 1. Department of Geology， Northwest University， Xi’an 710069， China； 2. State Key Laboratory of Continental Dynamics，Northwest University， Xi’an 710069， China
  • Online:2013-04-20 Published:2013-04-20

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Abstract:

Based on the analysis of cast slices, scanning electron microscope, mercury injection test and well logging, this paper studied the physical properties and formation mechanism of Shan 2 member in northern Zizhou area, Ordos Basin. The result shows that the reservoir of Shan 2 member mainly developed quartz sandstone and lithic sandstone.The reservoir spaces are mainly intergranular pores and dissolved pores of P1sh23, and micropores of P1sh22 and P1sh21 reservoirs. The reservoir belongs to low porosity and low permeability reservoir. Delta front subaqueous distributary channel is the main facies belt for forming reservoirs. The reservoir properties are controlled by sedimentation, diagenesis, pore structure types and its combination patterns. The physical properties were mainly reduced by compaction press-solution and cementation.

Key words: statistical characteristics, non-Gaussian distribution, mixed phase, colored compensation, resolution

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