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Evaluation criteria for development degree of micro cracks in oil and gas reservoir
Author(s): 
Pages: 33-37
Year: Issue:  4
Journal: ACTA PETROLEI SINICA

Keyword:  裂缝型油气藏微裂缝发育程度判别准则扩容非线性应变实验研究;
Abstract: 实验研究表明,变形导致的岩石微破裂会使岩石产生扩容(体积膨胀)和非线性变形.当差应力达到岩石的屈服应力时,扩容和非线性应变开始.此外,随应力水平的增加,扩容和非线性变形呈幂函数形式增加.在围压低时,最大扩容量呈上升趋势,围压较高时呈下降趋势;非线性应变量随围压的增加而呈单调增加.这一结果可作为评价裂缝型油气藏裂缝发育密集程度的一种判别准则.与以往用破裂准则、应力和应变能大小等评价裂缝发育程度的方法相比,它更真实地反映了裂缝形成、扩展直至饱和阶段与应力的对应关系.扩容和非线性变形之间的差异在于扩容更偏重于张性裂缝,非线性变形更偏重于剪切裂缝.
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