Analysis Of Influencing Factors Of IP In Wells And Research On Correction

As an important geophysical exploration method,borehole IP is not affected by the near-surface overburden,and the exploration depth is deeper than that of general electrical exploration methods.With the development of borehole IP technology,in addition to its application to mineral exploration,it has also been widely used in environmental testing and other fields,and many results have been achieved.Analyzing and correcting the influencing factors of the IP in the well can help workers to better collect and interpret the IP data in the well.In this paper,firstly through the borehole IP forward modeling theory,combined with the abnormal potential method,using the variable step size finite-difference three-dimensional numerical simulation method,through Matlab programming to achieve the borehole IP three-dimensional numerical simulation,at the same time,using the filter solution of the two-layer formation model The analytical solution with the spherical anomaly verifies the correctness of the algorithm.Based on the implemented three-dimensional numerical simulation algorithm of induced polarization in the well,the response curve law of apparent resistivity or apparent polarizability under the conditions of borehole size,electrode system,and well fluid and its invasion zone is analyzed,especially the three-pole device(The position of the power supply electrode A is not fixed,the distance between the fixed electrode system AMN,the overall movement measurement in the well)the response curve characteristics of the apparent resistivity or the apparent polarizability,and it is proved that the device can improve the impact of the induced polarization in the well on the blind mine.The resolution of the body.According to the relationship between apparent resistivity and actual resistivity under different influencing factors,an "adaptive noise filter" algorithm is proposed and used to correct the wellbore,well fluid,and its invasion zone,and the results show that the correction process is effective.The method has a certain effect.Finally,according to the analysis and correction results of the influencing factors of the in-well IP,a meaningful conclusion is drawn,and the thinking and discussion on the theoretical method of the in-well IP are given.