4 results about "Perfectly matched layer" patented technology

The invention provides a well-ground frequency domain electromagnetic detection method and device and electronic equipment, and the method comprises the steps: setting a perfect matching layer based on stretching coordinate transformation at the outer side of a model based on a three-dimensional geologic model, constructing an overall computational domain, facing the overall computational domain, and implementing adaptive mesh generation according to posterior error estimation. And generating an unstructured tetrahedral mesh which is locally refined in a target area, and on the tetrahedral mesh, performing spatial discretization and solution on a frequency domain Maxwell equation by adopting a first-order or second-order vector finite element in an H (curl) space to realize well-ground frequency domain electromagnetic forward modeling calculation. According to the method, through cooperation of the adaptive grids and the vector finite elements under the microframework, both precision and efficiency are considered, forward modeling stability and imaging resolution are improved, and a scientific basis is provided for efficiency improvement and cost saving of mineral resource exploration and development.

The application belongs to the field of electromagnetism, and particularly relates to a kind of time domain finite difference method open field simulation high-order perfectly matched layer implementation method and system, aims at solving how to avoid the problem of cascade solution and parameter coupling in PML under the same algorithm consumption as existing high-order PML. The method comprises: constructing PML tensor, the inverse of which is the weighted sum of the inverses of multiple complex frequency shift PML sub-tensors; constructing PML auxiliary variables based on PML tensor and Maxwell equations, including electric field component coupling auxiliary variables and magnetic field component coupling auxiliary variables; updating PML auxiliary variables using recursive convolution method or auxiliary differential equation method, and updating electric field intensity components and magnetic field intensity components according to the updated PML auxiliary variables. The time domain finite difference method open field simulation high-order PML implementation method and system provided in the application effectively overcome the defects of existing high-order PML cascade solution complexity and parameter coupling under the same algorithm consumption.

This invention provides a well-to-surface frequency domain electromagnetic detection method, device, and electronic equipment. It includes constructing a holistic computational domain based on a three-dimensional geological model, setting a perfectly matched layer based on stretched coordinate transformation outside the model, and performing adaptive mesh generation based on posterior error estimation within this domain. This generates a locally refined unstructured tetrahedral mesh in the target area. On this tetrahedral mesh, first- or second-order vector finite element methods are used in H (curl) space to spatially discretize and solve Maxwell's equations in the frequency domain, achieving well-to-surface frequency domain electromagnetic forward modeling. This invention, through the synergy of adaptive meshing and vector finite element methods within a differentiable framework, balances accuracy and efficiency, improves forward modeling stability and imaging resolution, and provides a scientific basis for improving efficiency and saving costs in mineral resource exploration and development.

The application relates to a kind of based on display stable compensation viscous anisotropic reverse time migration method, system and medium, comprising: by explicit stable compensation constant fractional order viscous wave equation and perfectly matched layer absorbing boundary condition, from initial time, along time direction forward solution, obtain the seismic wave field value of all time; By explicit stable compensation constant fractional order viscous wave equation and perfectly matched layer absorbing boundary condition, along time negative direction reconstruction seismic wave field;From the maximum time, along time direction negative solution, obtain the seismic wave field value of all time at geophone point;According to seismic wave field and geophone point seismic wave field, obtain underground structure imaging result.It can stably compensate the amplitude attenuation phenomenon, does not produce high frequency abnormal value, in the case where quality factor Q changes sharply with space, amplitude compensation and migration imaging can also be accurately carried out, ensure that stratum phase axis is reasonably and correctly homing.