Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 112-123.doi: 10.12108/yxyqc.20180313

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New evaluation method of shale reservoir fracability based on logging data

ZHAI Wenbao1, LI Jun1, ZHOU Yingcao2, LIU Gonghui1,3, HUANG Tao1, SONG Xuefeng1   

  1. 1. College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Engineering Technology R & D Company Limited, CNPC, Beijing 102206, China;
    3. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
  • Received:2018-01-10 Revised:2018-02-25 Online:2018-05-21 Published:2018-05-21

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Abstract: There are many factors that affect the fracability of shale reservoirs,so it is difficult to establish a continuous and complete evaluation method for shale reservoirfracability.Due to the advantage that we can obtain continuous and complete stratigraphic information from logging data,based on the influences of shale brittleness index,mineral composition,gas-bearing capability and fracture toughness on fracability,the fractability evaluation model of shale reservoirs in long horizontal well section was established by using analytic hierarchy process, and the catastrophe theory was introduced to form a new method for evaluating fracability of shale reservoirs.The fracability for a horizontal well in Weiyuan area of Sichuan Basin was respectively evaluated by the new method and analytic hierarchy process,and the evaluation results were compared with the actual fracture development of fractured shale reservoir from microseismic monitoring and the reservoir classification based on well logging data.The results show that the evaluation results of 11th level fracturing section based on catastrophe theory are in good agreement with the actual effective fracturing volume after fracturing and reservoir classification based on well logging data.The research results can provide theoretical basis for evaluation before fracturing and improvement of hydraulic fracturing stimulation in Weiyuan area.

Key words: volcanic rock, rock mass division, lithologic cycle, logging electrical characteristics, seismic reflection characteristics, Carboniferous, eastern Junggar Basin

CLC Number: 

  • TE377
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