复电阻率法二维正演并行计算研究

A study on parallel computation for two-dimensional complex resistivity forward modeling

复电阻率法二维正演采用二次场算法,结合有限单元法进行离散化,然后引入ColeCole模型,完成数值模拟。通过理论模型试算验证了二维正演程序的正确性。当模型剖分较细时,多发射源、多频率的正演计算效率有待提高。复电阻率法二维数值模拟是按发射源或频率计算,且各发射源之间、各频率之间计算是相互独立且互不影响的,因此通过引入MPI并行计算来提高其计算效率,从而减少其正演所需的时间。采用串行、并行复电阻率法二维正演程序来计算同一理论模型,结果验证了该并行程序的正确性。对并行算法的效率进行分析表明,该并行算法是可靠的、高效的。

The complex resistivity method is an artificial source exploration method which is based on the electrical difference of rocks.Two-dimensional forward modeling employs secondary field algorithm,by using the finite element method to discretize the differential equation,and then introduce Cole-Cole model,the numerical simulation is completed.The calculating synthetic model tests,indicate that the accuracy of the forward algorithm is reliable and robust.When the model is divided into smaller parts,the forward modeling efficiency of multi-transmitter and multi-frequency are still to be improved.Twodimensional numerical simulations are calculated at sources or frequencies,the calculations between the sources or between frequencies are independent on each other,so the MPI parallel computing is introduced to improve the calculation efficiency,to reduce the time needed for the forward modeling.In this paper,after calculating the same synthetic model by serial and parallel codes,the results show that the parallel algorithm is robust.By analyzing the efficiency of parallel algorithm,the parallel algorithm is reliable and efficient.