Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 161-168.doi: 10.12108/yxyqc.20200218

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Fracturing effect evaluation based on borehole microseismic monitoring method: a case study from well Y22 in Jilin exploration area

ZHAO Chaofeng1, JIA Zhenjia2, TIAN Jiantao1, GAO Rongjin3, ZHANG Wei1, ZHAO Jianyu1   

  1. 1. Liaohe Geophysical Exploration Company, Bureau of Geophysical Prospecting INC., CNPC, Panjin 124010, Liaoning, China;
    2. Unconditional Resource Development Corporation, PetroChina Jilin Oilfield Company, Songyuan 138000, Jilin, China;
    3. Research Institute of Exploration and Development, PetroChina Liaohe Oilfield Company, Panjin 124010, Liaoning, China
  • Received:2019-08-21 Revised:2019-10-29 Online:2020-03-21 Published:2020-01-19

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Abstract: Evaluation of reservoir hydraulic fracturing effect is of great significance for guiding the fine development of oil and gas fields. In order to accurately evaluate the fracturing effect,a fracturing effect evaluation method of microseismic monitoring in wells was proposed. On the basis of accurately locating microseismic events,the temporal and spatial distribution characteristics of microseismic events were analyzed,ineffective microseismic events were eliminated,the length,width,height,trend,reconstruction volume of fracture network were quantitatively described by using effective events,and fracturing effect was objectively evaluated by explaining the causes of fractures in combination with reservoir properties and fracturing operation parameters. The application results of well Y22 in Jilin exploration area show that the fracturing fracture strike is consistent with that of surrounding small faults or natural fissures. The results of log interpretation and microseismic monitoring are correlated,and the fractured reservoir with better log interpretation has relatively greater fracturing volume,more microseismic events and higher fracture complexity. The discrete microseismic events during fracturing are irrelevant to the fracture channeling layer but result from stress release in the low stress area that caused by pressure transmission. The formation energy deficit of other wells around well Y22 caused by primary fracturing and later production of oil and gas results in the asymmetry of the fracturing fractures in well Y22. The research results can be used to explain the temporal and spatial distribution characteristics of microseismic events,improve the understanding of fracturing and reservoir properties, and evaluate the fracturing effect objectively and accurately.

Key words: microseismic monitoring, fracturing evaluation, reservoir characteristics, fracturing parameters, oil field development, asymmetry

CLC Number: 

  • TE357.1
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