Support domain fast construction method of direct current resistivity element-free method simulation

Abstract

The invention provides a support domain fast construction method of direct current resistivity element-free method simulation. The method includes the following steps: determining distribution information such as media, landforms and electrodes of a two-dimensional geoelectric model, establishing a calculating domain of a direct current resistivity element-free method, and utilizing an irregular node discrete geoelectric model; arranging and numbering all nodes from small to large according to the x coordinate of the nodes and the z coordinate to give initial support domain parameters; takingthe center point of a background unit as a center, constructing a first class local support domain according to the parameters, dividing the background unit into four sub-domains in the support domain, taking the center points of the sub-domains as centers, constructing second class support domains, and selecting Ng nodes which are close to a Gauss point as the support domain for each Gauss pointin the sub-domains; and performing element-free method calculation to obtain observation apparent resistivity parameters. The method can distribute discrete models based on any nodes so that the support domains can be rapidly constructed, and therefore, calculating efficiency of conventional direct current resistivity element-free method forward modeling can be enhanced.

Description

technical field [0001] The invention relates to a DC resistivity forward modeling method in the field of exploration geophysics, in particular to a high-precision, high-flexibility and high-adaptability unit-free forward modeling method for complex geoelectric models. Background technique [0002] DC resistivity prospecting is an important method in geophysical prospecting, which is widely used in solid mineral resource prospecting, hydrogeological prospecting, environmental governance and monitoring, engineering geophysical prospecting and other fields. The measured apparent resistivity has a direct relationship with the resistivity of the underground medium. By artificially supplying electricity to the underground, observing the apparent resistivity on the surface or in the well can judge the distribution of underground resistivity anomalies. With the development of DC resistivity exploration technology, there is an increasing demand for high-precision, high adaptability a...

AI Technical Summary

Problems solved by technology

However, in the conventional support region construction method of the DC resistivity element-free method, each Gaussian point is independently constructed in the global node, and all nodes need to be searched one by one according to the node number from small to large. When the support region node When the number does not meet the set requirements, it is necessary to expand or reduce the size of the support domain to reconstruct the support domain until the support domain setting requirements are met, which consumes a lot of time and limits the application of the element-free method in DC resistivity forward modeling

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