Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 159-170.doi: 10.12108/yxyqc.20220415

• PETROLEUM ENGINEERING AND OILFIELD DEVELOPMENT • Previous Articles    

Reconstruction of 3D geological model of braided river sandstone reservoirs: A case study of Neogene Guantao Formation in Gaoshangpu block,Jidong Oilfield

LIU Yangping1, WU Boran1, YU Zhongliang1, YU Chenglin1, WANG Lixin2, YIN Yanshu2   

  1. 1. Research Institute of Exploration and Development, PetroChina Jidong Oilfield Company, Tangshan 063200, Hebei, China;
    2. School of Geosciences, Yangtze University, Wuhan 430100, China
  • Received:2021-08-09 Revised:2022-02-21 Online:2022-07-01 Published:2022-07-07

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Abstract: Taking two-dimensional plane facies and profile facies of oil group Ⅳ of Neogene Guantao Formation in Gaoshangpu block of Jidong Oilfield as training images, the multi-point geostatistics probability of three-dimensional sedimentary facies was obtained by linear pooling method,the sedimentary facies types of estimated points were determined by Monte Carlo sampling, the three-dimensional fine geological model of braided river was established,and its accuracy was verified by sparse well pattern method. The results show that:(1)The main production layer in the study area is the fifth member of Guantao Formation,and sublayers 12 and 13 mainly developed channel bar,braided channel and flood plain microfacies. The channel bar is characterized by flat bottom and convex top,and the braided channel is characterized by flat top and convex bottom. The scale of channel and channel bar is small,and the general width is less than 600 m. Flood plain developed at the top of braided channel, which is characterized by sand covered by mud as a whole. The width of braided channel belts is 650-1 300 m, the average length and width of channel bar are 480 m and 176 m respectively, and the average width of braided channel is 71 m.(2)The reservoir sand body shape and spatial distribution were accurately depicted by the geological model. On the plane,the position of the channel bar is consistent with geological analysis results,and the characteristics of the thick center and thin wings of the channel bar were shown. On profile,the channel bar has the characteristics of flat bottom and convex top. In the model,the error of mudstone proportion is 9.8%,the error of channel bar proportion is 3.4%,and the error of channel proportion is 6.4%. As a whole,the modeling error is less than 10.0%.

Key words: braided river, channel bar, multi-point geostatistics, 3D geological model, Guantao Formation, Gaoshangpu block, Nanpu Sag, Jidong Oilfield

CLC Number: 

  • TE122.1
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