摘要
裂缝孔隙度指数对评价裂缝性地层具有十分重要的意义.在实际的工作中通常取m_f=1.5(即取理想情况下的裂缝孔隙度指数m_f=1与基质岩块的孔隙度指数m_b=2的算术平均值)。经分析m_f的计算公式,认为取m_f=1.5并不合理。本文从裂缝岩石的体积物理模型入手,给出了较为实际的m_f值。
Fracture porosity index is of great significance for fracturcd formation evaluation. Usu-ally m_f adopts 1.5 in practice (that is, under ideal condition, fracture porosity index m_f = 1, the porosity index of rock matrix m_b = 2, the average is adopted). Analysis of the calcula-tion formula for m_f shows that adopting m_f = 1.5 is not proper. This paper establishes aphysical model of fracture formation, consequently gives a more proper m_f value.
