Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (1): 71-80.doi: 10.3969/j.issn.1673-8926.2017.01.009

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Reservoir characteristics and pore evolution of the second member of the Lower Cretaceous Bayingebi Formation in Chagan Depression

WU-CHEN Bingjie1,2, ZHU Xiaomin1,2, WEI Wei1,2, JIANG Feihu3, TAN Mingxuan1,2, PAN Rong1,2   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Exploration and Development, Sinopec Zhongyuan Oilfield Company, Puyang 457001, Henan, China
  • Received:2016-08-10 Revised:2016-10-15 Online:2017-01-21 Published:2017-01-21

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Abstract: In order to study the characteristics of clastic reservoir and the effects of diagenesis on porosity of the second member of the Lower Cretaceous Bayingebi Formation(K1 b2)in Chagan Depression,a pore evolution model was established based on the data of core,thin section observation,X-ray diffraction and SEM. The reservoir rock of K1 b2 is mainly composed of feldspar lithic sandstone. The reservoir properties are poor,with ultralow porosity and ultra-low permeability. The porosity ranges from 0.17% to 15.32% with an average of 5.7%, and the permeability ranges from 0.003 7 mD to 162.300 0 mD,with an average of 3.4 mD. Intergranular dissolved pores are the main reservoir space. The reservoir of K1 b2 underwent mainly mechanical compaction,early carbonate cementation,carbonate dissolution and late carbonate cementation. Dissolution of carbonate cements, feldspar and rock debris created a secondary pore zone among 2 100-2 800 m,which improves the reservoir properties. The K1 b2 reservoir is mainly at the middle diagenetic A2 stage. The results show that the original porosity of K1 b2 is 30.5% in the Wuliji tectonic zone,compaction reduced the porosity of 19.8%,while the cementation reduced porosity of 9.7%,and the dissolution increased porosity by 3.7%,which improves the reservoir properties( the current porosity is approximately 4.8%). This result matches well with actual porosity,which has a contribution to cognize pore evolution process and predict high quality reservoirs.

CLC Number: 

  • TE343
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