If the relativity between formation factor and porosity from rock experimentation is little, the values of a and m calculated by different regression methods using the data from the same experimentation may be different.

• 应用岩电实验数据确定阿尔奇公式中a,m值时发现地层因素与孔隙度的相关性较差,通过不同的回归处理方法得到的a,m值有时相差较大,甚至出现一些异常的情况。