Spontaneous Potential Logging Equations In The Non-symmetric Case The Approximate Solution

An approximate solution of the spontaneous potential well-logging equation for asymmetric rock layers structure and its error estimate were given in this paper.Base on the estimate,it can be found that the error grows as the ratio of the height of the enclosing rock to the breadth of the invaded zone decreases.To overcome this problem,using the new transformation,a new approximate solution was given in this paper.Finally,we discussed the structure and application of the approximate solution.