Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (6): 40-45.doi: 10.3969/j.issn.1673-8926.2014.06.007

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Sedimentary characteristics and genesis of thick layer sand body of Chang 8 2 sublayer in Ordos Basin

YAO Jingli1，2，CHU Meijuan1，2，BAI Chang’er1，2，YUAN Xiaoming3，GUO Zhengquan1，2
  

  1.  1. Research Institute of Exploration and Development ， PetroChina Changqing Oilfield Company ， Xi ’ an 710018 ， China ； 2. National Laboratory of Low Permeability Oil and Gas Fields Exploration and Development ， Xi ’ an 710018 ， China ； 3. Department of Exploration ， PetroChina Changqing Oilfield Company ， Xi ’ an 710018 ， China
  • Online:2014-11-20 Published:2014-11-20

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Abstract:

Based on core observation, combining with data analysis of well log and laboratory test, this paper analyzed the sedimentary characteristics of Chang 8 2 sublayer, and restored the sedimentary environment and sedimentary evolution. The result shows that Chang 8 2 sublayer belongs to regressive system tract, and experienced a complete MSC （ from lake ingress to lake retreat ） . In the early-middle period, lake district expanded with relatively deeper water, and the sedimentary environment is mainly delta front subfacies, with mouth bar developed. In late period, it is plain and swamping deposition, and mainly developed distributary channel microfacies, the thickness of the sand body is thin, and physical properties are poor. Rapid accumulation of the mouth bar controlled by lake shoreline is the main cause of the growth of Chang 8 2 thick sand body.

Key words:  reservoir characteristics , controllingfactors, Tagi Formattion, Hamra Formation, Triassic Basin, North Africa

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