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2-D Sharp Boundary Inversion of Direct Current Resistivity Data

Author: LiuHan
Tutor: TanHanDong
School: Chinese Geology University (Beijing)
Course: Earth Exploration and Information Technology
Keywords: D resistivity inversion method Sharp change boundary inversion Oakham inversion Finite Element Method
CLC: P631.3
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 0
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Abstract


DC prospecting exploration method one of the more common applications , geophysical exploration DC resistivity method in two-dimensional anti resistivity method can achieve good application on the census of metals , non-metallic mineral and geological structure , speech technology is also particularly important. DC resistivity method of two-dimensional inversion method has matured , but the inversion of the DC law is limited mostly to anti- smooth performance of ground interface , when encountered geological unit has a uniform conductivity sharp change of electrical boundary split , smooth model inversion boundary position is not clear . Compared with the smooth model inversion , sharp electrical variable boundary model inversion method in determining the boundary surface of the model ground is even better . Electrically sharp change boundary model inversion method from model building on the 2D geologic structure is expressed as a limited number of the layers having a uniform conductivity , the thickness of these layers in the transverse direction is changed , the inversion parameters are layers conductivity value boundary depth of its lower base (i.e. , geologic unit interface) , for a given level of fitting is poor, minimal to the inversion of the response data of the model by the layer interface and the conductivity transverse layer roughness , In order to make the inversion stable , the method also increases the adjacent unit resistivity difference plus penalties . Electrical sharp variable boundary model inversion method is introduced to the inversion of DC resistivity method , forward algorithm for DC resistivity method finite element , the sharp change of electrical the boundary model two-dimensional inversion algorithm , Oakham inversion algorithm, Jacobian matrix calculation method to complete the DC resistivity method D electrical sharp change boundary model inversion algorithm implementations . And the application of the method to the inversion of synthetic data to the theoretical model , and verify the effectiveness and feasibility of the method .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Electrical prospecting
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