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利用测井信息和Hoek-Brown准则,推导了地质强度指标GSI和岩体强度指数RMi中节理状态参数JP的理论公式,给出了井筒方向煤岩破碎分级的修正GSI-JP分析方法。应用分层地应力模型分析煤岩单点最大、最小主应力,并结合霍克–布朗准则提出煤岩破碎分级辅助判据。根据煤岩GSI-JP值和破碎系数大小将破碎程度划分为A、B、C、D4个等级,确定煤岩破碎分级标准。应用修正GSI-JP分级方法和破碎系数辅助判据,对沁水盆地ZP-1井煤岩段破碎程度进行预测。结果表明:ZP-1井煤岩段修正GSI值为30～50;RMI法JP值大小为0.10～0.25;破碎系数集中在0.8～1.0。对照破碎分级标准,煤岩均表现为较强破碎(B级);对比室内煤岩结构电镜扫描结果,该方法预测结果与实际煤岩破碎程度近似,验证了预测结果。基于此方法,开发一套煤岩破碎分级预测软件。
Using the well logging information and the Hoek-Brown criterion, the theoretical formula of the geomechanical index GSI and the joint state parameter JP of the rock mass strength index RMi is deduced. The modified GSI-JP method for the classification of coal and rock fractures in the wellbore direction is given. The stratified stress model is used to analyze the maximum and minimum principal stress of single point of coal and coal, and the coal-rock crushing and grading assisting criterion is put forward based on the Hawk-Brown criterion. According to the value of GSI-JP and the size of the crushing coefficient, the degree of crushing is divided into four grades: A, B, C and D, and the crushing and grading standards of coal and rock are determined. The modified GSI-JP classification method and the broken coefficient auxiliary criterion were used to predict the degree of crushing of the coal and rock sections of the ZP-1 well in the Qinshui Basin. The results show that the corrected GSI value of coal and rock sections in ZP-1 well is 30-50, the JP value of RMI method is 0.10-0.25, and the breaking coefficient is 0.8-1.0. Comparing with crushing and grading standards, coal and rock show strong crushing (Grade B). Comparing the results of SEM and SEM, the predicted results are close to the actual degree of crushing of coal and rock, which proves the prediction results. Based on this method, a set of coal rock fracturing classification software is developed.