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Rock mechanics study and fracability evaluation forLongmaxi Formation of Baojing block in Hunan Province

Cui Chun-lan,Dong Zhen-guo,Wu De-shan   

  1. Shenhua Geological Exploration Ltd.Co.,Beijing 102211,China
  • Received:2018-10-16 Revised:2018-12-28 Online:2019-05-10

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Abstract: In order to evaluate the shale gas potential and productivity of the Longmaxi Formation in Baojing block,we need to evaluate the fracability of the Longmaxi Formation shale reservoir after completion,which can provide a reference for the future fracturing transformation and well test.Based on the analysis and processing of wireline logging,mud logging and core test data in the study area,we study the characteristics of the Longmaxi Formation shale reservoir in Baojing block and the key factors affecting the fracability of rock,obtaining the positive correlation index and the negative correlation index which have impact on fracability.A mathematical model for quantitative evaluation of the shale reservoir fracability in the study area is established based on the correlation analysis method and the analytic hierarchy process.The results show that the Longmaxi Formation shale reservoir has many characteristics,such as rich in organic matter,low porosity,low permeability,high brittle mineral content,high Young’s modulus,medium Poisson’s ratio,and small difference coefficient of ground stress,with certain shale gas exploration potential and fracturing conditions.Using the fracture index,the shale fracability of the area is divided into three levels,that is,the fracability is poor (the fracture index is 0.1-0.4),the fracability is medium (the fracture index is 0.4-0.6),and the fracability is good (fracture index > 0.6).Reservoir with a fracture index greater than 0.4 should be selected for hydraulic fracturing.The fracture index model is used to calculate the fracability of the shale reservoir in the study area.With high fracture index,the Well Baoye 3 is an ideal fracture candidate well for study area.While Well Baoye 1 fracture index is lower and the fracturing transformation is more difficult.The evaluation results are matched with the post-fracturing effect.The research results can provide reference for the quantitative evaluation and fracturing construction of shale gas and coalbed methane in the future.

Key words: Shale gas, Rock mechanics, Brittle analysis, Fracability, Fracturing & well test, Baojing block of Hunan Province

CLC Number: 

  • TE130
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