Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 77-86.doi: 10.3969/j.issn.1673-8926.2017.02.010

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Tight reservoir characteristics and diagenesis of A'ershan Formation in Erennao'er Sag, Erlian Basin

HE Mingwei1,2, ZHU Xiaomin1,2, ZHU Shifa1,2, WEIWei1,2, WU Jianping3, WANG Mingwei3   

  1. 1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
  • Received:2016-11-18 Revised:2016-12-18 Online:2017-03-21 Published:2017-03-21

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Abstract: The Lower Cretaceous reservoirs are characterized by tight and complex types of rocks and good oil shows in the sags of Erlian Basin. Based on the data of cores,thin sections,cathodeluminescence,X-ray diffraction and scanning electron microscope,the tight reservoir characteristics and diagenesis of the Lower Cretaceous A'ershan Formation in Erennao'er Sag were studied. The results show that the reservoirs are composed of dolomitic(calcareous)mudstone,dolomitic(calcareous)tuffite,dolomitic(calcareous)siltstone and calcareous sandstone. The reservoir properties are poor,with the average porosity and permeability of 7.44% and 1.11 mD, respectively. The dolomitic(calcareous)mudstone and dolomitic(calcareous)tuffite are mainly developed in semi-deep lacustrine and shore-shallow lacustrine,and the pore types are mainly intercrystal pores and fractures.Dolomitic(calcareous)siltstone and calcareous sandstone are mainly developed in sheet sand and subaqueous distributary channel in fan delta,and the reservoir spaces are mainly intergranular pores,intragranular pores and cracks. The tight reservoir properties are mainly controlled by diagenesis and sedimentation. Although compaction leads to the decrease of original pores,and calcareous and dolomitic cementation make reservoir properties significantly deteriorated,dissolution improves the reservoir properties.

CLC Number: 

  • TE122.2
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