基于分区并行的2.5维海洋可控源电磁法反演研究  

Inversion of 2.5D MCSEM based on partition parallelism

作　　者：张迎利 李赓 ZHANG Yingli;LI Geng(Department of Physics and Electronic Information,Henan Polytechnic University, Jiaozuo 454000,China)

机构地区：[1]河南理工大学物理与电子信息学院,焦作454000

出　　处：《物探化探计算技术》2020年第2期244-252,共9页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(41604112)。

摘　　要：这里实现了一种基于分区并行的2.5维海洋可控源电磁反演方法。正演采用基于总场的有限元方法,通过非结构化三角单元模拟复杂地形和倾斜边界,并利用后验误差估计来指示网格细化。为提高反演计算效率,通过将反演区域进行分解实现程序并行化,降低内存需求和计算时间。同时,为了在反演时设置更为合理的初始模型,根据地震解释剖面将反演区域划分为多个层位,每个层位电阻率值作为一个单独参数进行反演,然后将反演结果作为初始模型进行模型空间的OCCAM约束反演。数值算例表明,本反演方法对于薄储层电性边界刻画清晰,具有较高的分辨率。We have achieved a 2.5D inversion method for marine controlled source electromagnetic based on partition parallelism in this paper.In order to improve the adaptability of the forward algorithm,we consider a finite element method based on the total field formulation to simulate complex topography with an unstructured triangular element mesh,and a posteriori error estimators is used to indicate the grid refinement.To improve the efficiency of inversion calculation,we calculate the sensitivity of the inversion region and analyze influence range of the marine controlled source electromagnetic for decomposing the inversion region and reducing the computer memory needed and inversion time.Meanwhile,in order to set a more reasonable initial model in the inversion,we divide the inversion region into multiple horizons according to the seismic profile.Each layer resistivity value is inverted as a separate parameter,and then the inversion result is used as the initial model for OCCAM inversion.The result shows that the inversion method is clearly for thin reservoir electrical boundaries and has a high resolution.

关 键 词：海洋可控源电磁法 有限元 并行 OCCAM 反演 

分 类 号：P631.2[天文地球—地质矿产勘探]