【摘要】 大地电磁测深法是以岩石的电性差异为基础和前提的勘探方法.本文所采用的大地电磁二维反演方法为共轭梯度法,该方法避免了求解雅可比矩阵,效率较高,但是在将模型剖分为较细网格,多频率进行计算时效率有待提高.基于大地电磁根据各频率依次独立处理数据的特点,在本文中采用了MPI并行运算方法,用多个进程同时来计算各频率数据,最后再将数据进行收集,得到最后的计算结果.通过对正演和反演结果的比较,验证了程序的正确性.对并行算法的效率进行了统计,进程数为2~8时,加速比能达到1.63~2.64,验证了并行算法的有效性.更多还原

【Abstract】 Magnetotelluric sounding method based on the difference of the rock’s resistivity is an exploration method which do research in earth ’s resistivity and phase using the native electromagnetic field. The paper introduces the inversion algorithm of 2 D magnetotelluric named nonlinear conjugate gradient method,the method which avoid resolving the jacobi matrix is very effective,but the method is not effective enough when the model is divided into dense grid. This study can do more computation during the time using the parallel computation,and then gather and sort the data processed. We compare the results of the serial algorithm with the result of the parallel algorithm,it proves that the parallel algorithm is correct. When the number of the processes is 2 to 8,the speedup ratio is 1. 63 to 2. 64. It improves the effectivity of the parallel algorithm of 2 D magnetotelluric.更多还原