Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 52-62.doi: 10.12108/yxyqc.20210406

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir characteristics and diagenetic traps of the first member of Permian Xiashihezi Formation in Daniudi gas field,Ordos Basin

XU Ningning1,2, WANG Yongshi3, ZHANG Shoupeng2, QIU Longwei4, ZHANG Xiangjin5, LIN Ru6   

  1. 1. Postdoctoral Scientic Research Working Station of Sinopec Shengli Oilfield Company, Dongying 257000, Shandong, China;
    2. Research Institute of Petroleum Exploration and Development, Sinopec Shengli Oilfield Company, Dongying 257022, Shandong, China;
    3. Sinopec Shengli Oilfield Company, Dongying 257022, Shandong, China;
    4. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    5. Tianjin Fanglian Technology Development Co., Ltd, Tianjin 300280, China;
    6. Lu Sheng Petroleum Development Co., Ltd, Dongying 257077, Shandong, China
  • Received:2020-07-27 Revised:2020-12-07 Online:2021-08-01 Published:2021-08-06

Abstract: In order to clarify the characteristics of tight clastic reservoirs and the development mechanism of diagenetic traps of the first member of Permian Xiashihezi Formation(P1x1)in Daniudi gas field,Ordos Basin,gasbearing property analysis,casting thin section identification and carbon-oxygen isotope analysis were carried out. Through the analysis of diagenetic microscopic characteristics and quantitative statistics,the petrological characteristics and diagenetic porosity evolution of P1x1 in the study area were determined,and the development mechanism of diagenetic traps was explained. The results show that: (1)The content of quartz particles in the dry interval of P1x1 is about 15% lower than that in the gas-bearing interval,and the interstitial-filling materials are mainly calcite cements and compacted dense pseudomatrix. The dry intervals are mainly distributed in the transitional zone between the two sand bodies along the main channel,the edge of the transverse channel and the relatively isolated lenticular sand bodies.(2)The diagenetic traps in the study area can be divided into calcite-cementationreplacement and compaction-silica-cementation according to their genetic differences. The former was characterized by obvious calcite cementation and reached densification before the gas accumulation stage(Middle and Late Jurassic to Cretaceous). Particles in latter were in close contact with each other,with obvious pseudomatrix,which was characterized by "reservoir-forming and densification". The densification of reservoirs and hydrocarbon charging occured at the same time.(3)On the one hand,there is a good coupling relationship between reservoir densification and gas accumulation,and on the other hand,the large-scale calcite cementation in the A1 stage of middle diagenesis and the continuous compaction and pore reduction effect caused by high content of plastic debris. The research results can be used for reference to the exploration of diagenetic traps with similar geological conditions.

Key words: tight sandstone, diagenetic trap, diagenetic facies, the first member of Xiashihezi Formation, Permian, Daniudi gas field, Ordos Basin

CLC Number: 

  • TE122.2
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