感应测井趋肤效应校正的研究

传统的感应测井趋肤效应校正方法有乘加因子法和函数拟合法等,但它们的校正误差都较大,还含有人为的操作因素.乘加因子法必须对视电导率进行分段,不同范围段有着不同的乘因子和加因子.函数拟合法的校正公式属于经验型公式,其中参数有待考证.而埃特金迭代法采用精确的视电导率计算公式,经过多次迭代,弥补了前2种方法的不足之处.只要保持传播系数小于1这个收敛条件,该方法可以实用于任何频率和线圈系.趋肤效应校正后的结果与地层真电导率基本保持一致,有着相当高的精确性,明显优越于传统的校正方法.

On Skin Effect Correction in Induction Log

The correction of skin effect plays a great role in the signal processing in induction log.The traditionary correction methods of the skin effect for induction log have the multiplying-adding factor and function fitting,but they have obvious correction errors and factitious manipulation factors.The multiplying-adding factor method must divide apparent conductivity into many segments,and has(different) multiplying factors and adding factors in different ranges.The function fitting method's(correct) formula is experiential formula,some parameters still have to be researched.The Aitken(iteration) method adopts precise calculation formula of apparent conductivity,and has many times(iterations),makes up the shortages of the former two kinds of methods.If spread coefficient can keep the convergent condition which is less than one,the method can be used in any frequency and loop series.The result keeps consistent with real stratum conductivity,and has higher precision than traditionary method.