吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (4): 1268-1276.doi: 10.13278/j.cnki.jjuese.20170053
廖东良1,2, 曾义金1,2
Liao Dongliang1,2, Zeng Yijin1,2
摘要： 利用测井资料建立地层剪破裂模型是对现有张破裂的有效补充，有利于完善钻井、压裂等石油工程中的破裂机理。运用FMI（地层微电阻率扫描成像）测井资料能识别钻井诱导缝和剪破裂的方位、数量和密度。本文通过对地层剪破裂的理论研究和影响因素分析，利用内摩擦系数与矿物含量之间的非线性假设，建立了地层剪破裂的临界剪应力模型。研究发现，地层中的黏土矿物含量、内摩擦系数、内聚强度和应力大小是诱发剪破裂的重要因素。利用内摩擦系数（或内摩擦角）与泥质体积分数之间的统计回归模型简化了地层剪破裂模型，并增强了模型的适用性。实际资料表明，地层发生剪破裂时的临界剪应力与钻井诱导缝数量之间呈反比关系，理论研究与实际资料具有良好的一致性。
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