{"title":"libEMMI_MGFD: 使用频域多网格求解器进行海洋可控源电磁建模和反演的程序","authors":"Pengliang Yang, An Ping","doi":"arxiv-2407.20795","DOIUrl":null,"url":null,"abstract":"We develop a software package libEMMI\\_MGFD for 3D frequency-domain marine\ncontrolled-source electromagnetic (CSEM) modelling and inversion. It is the\nfirst open-source C program tailored for geometrical multigrid (GMG) CSEM\nsimulation. An volumetric anisotropic averaging scheme has been employed to\ncompute effective medium for modelling over uniform and nonuniform grid. The\ncomputing coordinate is aligned with acquisition geometry by rotation with the\nazimuth and dip angles, facilitating the injection of the source and the\nextraction of data with arbitrary orientations. Efficient nonlinear\noptimization is achieved using quasi-Newton scheme assisted with bisection\nbacktracking line search. In constructing the modularized Maxwell solver and\nevaluating the misfit and gradient for 3D CSEM inversion, the reverse\ncommunication technique is the key to the compaction of the software while\nmaintaining the computational performance. A number of numeric tests\ndemonstrate the efficiency of the modelling while preserving the solution\naccuracy. A 3D marine CSEM inversion example been been examined for resistivity\nimaging.","PeriodicalId":501270,"journal":{"name":"arXiv - PHYS - Geophysics","volume":"41 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"libEMMI_MGFD: A program of marine controlled-source electromagnetic modelling and inversion using frequency-domain multigrid solver\",\"authors\":\"Pengliang Yang, An Ping\",\"doi\":\"arxiv-2407.20795\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We develop a software package libEMMI\\\\_MGFD for 3D frequency-domain marine\\ncontrolled-source electromagnetic (CSEM) modelling and inversion. It is the\\nfirst open-source C program tailored for geometrical multigrid (GMG) CSEM\\nsimulation. An volumetric anisotropic averaging scheme has been employed to\\ncompute effective medium for modelling over uniform and nonuniform grid. The\\ncomputing coordinate is aligned with acquisition geometry by rotation with the\\nazimuth and dip angles, facilitating the injection of the source and the\\nextraction of data with arbitrary orientations. Efficient nonlinear\\noptimization is achieved using quasi-Newton scheme assisted with bisection\\nbacktracking line search. In constructing the modularized Maxwell solver and\\nevaluating the misfit and gradient for 3D CSEM inversion, the reverse\\ncommunication technique is the key to the compaction of the software while\\nmaintaining the computational performance. A number of numeric tests\\ndemonstrate the efficiency of the modelling while preserving the solution\\naccuracy. A 3D marine CSEM inversion example been been examined for resistivity\\nimaging.\",\"PeriodicalId\":501270,\"journal\":{\"name\":\"arXiv - PHYS - Geophysics\",\"volume\":\"41 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-07-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv - PHYS - Geophysics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/arxiv-2407.20795\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Geophysics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2407.20795","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
我们开发了一个用于三维频域海洋可控源电磁(CSEM)建模和反演的软件包 libEMMI\_MGFD 。这是第一个为几何多网格(GMG)CSEM 模拟定制的开源 C 程序。它采用了体积各向异性平均方案来计算有效介质,以便在均匀和非均匀网格上建模。计算坐标通过与方位角和倾角的旋转与采集几何对齐,便于注入源和提取任意方向的数据。采用准牛顿方案,并辅以分段回溯线搜索,实现了高效的非线性优化。在构建模块化麦克斯韦求解器和评估三维 CSEM 反演的失配和梯度时,反向通信技术是在保持计算性能的同时压缩软件的关键。大量数值测试证明了建模的效率,同时保持了求解精度。针对电阻率成像研究了三维海洋 CSEM 反演实例。
libEMMI_MGFD: A program of marine controlled-source electromagnetic modelling and inversion using frequency-domain multigrid solver
We develop a software package libEMMI\_MGFD for 3D frequency-domain marine
controlled-source electromagnetic (CSEM) modelling and inversion. It is the
first open-source C program tailored for geometrical multigrid (GMG) CSEM
simulation. An volumetric anisotropic averaging scheme has been employed to
compute effective medium for modelling over uniform and nonuniform grid. The
computing coordinate is aligned with acquisition geometry by rotation with the
azimuth and dip angles, facilitating the injection of the source and the
extraction of data with arbitrary orientations. Efficient nonlinear
optimization is achieved using quasi-Newton scheme assisted with bisection
backtracking line search. In constructing the modularized Maxwell solver and
evaluating the misfit and gradient for 3D CSEM inversion, the reverse
communication technique is the key to the compaction of the software while
maintaining the computational performance. A number of numeric tests
demonstrate the efficiency of the modelling while preserving the solution
accuracy. A 3D marine CSEM inversion example been been examined for resistivity
imaging.