Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 133-142.doi: 10.12108/yxyqc.20180315

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Logging fracturing evaluation for tight clastic gas reservoir and its application: a case from Denglouku Formation in Wangfu fault depression, Songliao Basin

ZHANG Shaolong1, YAN Jianping1,2, TANG Hongming1, SUN Hong3, WANG Min4, DONGZheng5   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Sichuan Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China;
    3. Research Institute of Exploration and Development, PetroChina Jilin Oilfield Company, Songyuan 138000, Jilin, China;
    4. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    5. Logging Division of Chuanqing Drilling Engineering Ltd Co., CNPC, Chongqing 400021, China
  • Received:2017-11-25 Revised:2018-01-12 Online:2018-05-21 Published:2018-05-21

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Abstract: Tight clastic gas reservoir of Denglouku Formation in Wangfu fault depression,Songliao Basin, is characterized by well-developed interlayers, multiple sets of gas water cycles and great difficulty in fracturing deve lopment. In order to overcome these difficulties for efficient production,combined with the data of core analysis, dipole shear wave and conventional logging,analytic hierarchy process was used to determine the parameters which are sensitive to reservoir fracturing property and their weight. The prediction method of fracturing height for tight clastic gas reservoir with interlayer well-developed was established after dividing fracturing grade. The results show that the sensitive parameters of fracturing evaluation for the tight and thin reservoirs of Denglouku Formation in Wangfu fault depression are brittle mineral content,brittleness index, Young's modulus and Poisson's ratio. Reservoirs with high content of brittle minerals,large brittleness index,large Young's modulus and low Poisson' ratio often have good fracturing property. When the comprehensive fracturing coefficient is greater than 0.55,the reservoir fracturing grade is grade I,which is suitable for fracturing development. There is a good ap plication effect on predicting the fracturing height of Denglouku Formation in well C11 by this method. The fractur ing height of the target zone is 7.125 m without water in the exploration process when the fracturing pressure is 33.5 MPa. The prediction results are in accordance with the actual fracturing results. The research results provide a technical basis for the effective exploitation of tight gas reservoirs.

Key words: high-pour point oil, microbial enhanced oil recovery, Geobacillus stearothermophilus, Geobacillus thermodenitrificans, Pseudomonas aeruginosa

CLC Number: 

  • TE37
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