The casing collar locator is an electric logging tool that detects the magneticanomaly caused by the relatively high mass of the casing collar.
套管接箍定位器是一种电测井下井仪器，它检测由套管接箍的相对较高的质量所引起的磁异常。
2
The results of the emulation and example show that the interpolation accuracy of these methods are different with distributing of known survey point and change of magneticanomaly.
仿真与实例计算结果表明，已知点的分布情况及磁异常变化情况不同时，四种逼近方法的插值精度是不同的。
3
The matched filtering method based on discrete cosine transform can improve accuracy and reliability of dividing gravitational and magneticanomaly.