油田地层的可压性评价是油田水力压裂施工中重点关注的问题,它直接关系到最终的增产效果.对某油田区块的深层岩石开展可压性评价,通过定义裂缝描述指数,结合岩石力学参数和残余应力2种方法计算的脆性指数,共同定量表征脆性指标;利用塑性应变能和岩石力学参数2种方法计算的塑性指数,来共同定量表征塑性指标;在脆性指标和塑性指标相互验证的前提下,基于这2种影响因素,给出了可压性指数的计算公式,利用7组试验岩心的计算结果,给出了油田目标区块的水力压裂施工指导性建议.%Fracability evaluation of oilfield formation is the key problem in hydraulic fracturing,which is directly related to the final increase production.In this paper,the fracability evaluation which aimed at the deep rock of one block of oilfield was carried on.Brittleness index which was combined with two calculation methods of rock mechanics parameters and residual stress was characterizated quantitatively,through defining the crack description index.Plasticity index was characterizated quantitatively by two calculation methods of plastic strain energy and rock mechanics parameters.Basing on above two factors,calculation formula of fracability index was obtained in the premise of mutual verification with brittleness index and plasticity index,and the calculation results of 7 groups of test cores were used to giving guidance suggestions for hydraulic fracturing of oilfield target block.
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