In 1942 Archie first brought out the concept of cementation exponent and determined that m=2, a=1 in clean sand based on the measurement of formation resistivity and porosity.

• 1942年阿尔奇(Archie)根据岩石电阻率与孔隙度的测量结果,首先提出了胶结指数的概念,并确定纯砂岩地层m=2,a=1。