Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 138-145.doi: 10.3969/j.issn.1673-8926.2017.04.017

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Reservoir modeling of tight sandstone gas reservoir based on geological knowledge database:a case from Su X block in Sulige Gas Field

YANG Tebo1,2, WANG Jiping1,2, WANG Yi1,2, FU Bin1,2, XUE Wen1,2, HAO Qian1,2   

  1. 1. Sulige Gas Field Research Center, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. State Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi'an 710018, China
  • Received:2016-07-24 Revised:2016-09-19 Online:2017-07-21 Published:2017-07-21

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Abstract: The tight sandstone gas reservoirs in Sulige Gas Field are characterized by unclear understanding of effective reservoir, lack of suitable modeling methods and low effective reservoir drilling rate of horizontal wells. Based on logging curves correlation of 169 wells in Su X block and geological understanding of braided river, the reservoir geological knowledge database was established, and combined with 3D image training, a new 3D multiplepoint geostatistics modeling method was put forward. The results show that the width, thickness, length and width-thickness ratio of braided river point bar are 200-450 m, 3-10 m, 450-1 000 m, 45:1-55:1,respectively, and the width of single braided river is 1 000-2 500 m. By using the geological knowledge database in the process of 3D image training, the geological model is more suitable to display the proportion between braided river and point bar, and reflects the overlap and migration characteristics of braided river sedimentary systems. Multi-point geostatistics method could apply 3D training image to 3D geological modeling of braided river, and presents a structure of"sand pack sand"in effective reservoir. Horizontal well drilling results confirm that the geological model could accurately predict the effective sandbodies and guide the geo-steering of the horizontal well in tight sandstone gas reservoir. This study will play a certain reference role to tight sandstone gas reservoir modeling.

Key words: dolomitic rocks, reservoir space, physical properties, diagenesis, A'ershan Formation, Bayindulan Sag

CLC Number: 

  • TE122.2
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