天然气地球科学 ›› 2020, Vol. 31 ›› Issue (3): 402416.doi: 10.11764/j.issn.1672-1926.2019.12.011
李长海1,2(),赵伦3,刘波1,2(),陈强4,陆成和4,孔悦1,2
Chang-hai LI1,2(),Lun ZHAO3,Bo LIU1,2(),Qiang CHEN4,Cheng-he LU4,Yue KONG1,2
摘要:
近年来随着非常规油气的开发,微裂缝对于油气勘探开发的意义日益突显。国内外学者围绕不同储层中微裂缝的定义、分类、成因、主控因素及预测方法等方面进行了广泛而深刻的探讨。总结认为:定义微裂缝长度的上限值为50 mm,开度的上限值在不同储层中有所差异。基于成因的分类方案优于其他分类方案且目前应用最广。不同岩石中的微裂缝均是构造作用、成岩作用和异常高压作用等单因素或多因素叠合作用下形成的。不同类型的微裂缝主控因素差异较大,且不同储层中同一类型的微裂缝主控因素也有所差异。微裂缝的预测目前仍处于早期探索阶段,现有方法存在准确性和可靠性差、对资料要求高和成本高等方面的问题。基于分形和压汞曲线等的定量化分析技术是微裂缝定量化表征的主要手段。微裂缝的研究对于宏观裂缝的预测、沉积成岩演化的恢复以及油气开发具有重要意义。不同储层中微裂缝的对比、微裂缝与沉积和成岩的关系、微裂缝预测与定量化研究、不同成因微裂缝与孔隙空间的组合关系以及不同成因微裂缝对储层渗透率的贡献是下一步微裂缝研究的重点。
中图分类号:
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