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A Data-space Inversion Method for 2-D DC Resistivity Data

Author: LiuJunHua
Tutor: TanHanDong
School: Chinese Geology University (Beijing)
Course: Earth Exploration and Information Technology
Keywords: Data space Resistivity inversion Wavenumber domain D inversion
CLC: P631.3
Type: Master's thesis
Year: 2011
Downloads: 118
Quote: 0
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Abstract


DC resistivity method is based on the crustal conductivity differences of rock and ore material basis, through the observation and study of the establishment of artificial underground distribution of current field to solve geological problems, an electrical prospecting prospecting target branch . A wide range of application of the resistivity method, whether metallic or non-metallic mineral census, or the geological structure of the study, resistivity method can achieve good results, while in hydrology, engineering, environmental and geological surveys increasingly The deeper. Efficient resistivity inversion technique is essential in order to guarantee that the resistivity method to achieve better effect in various application areas. Mainstream inversion method: the method of least squares, OCCAM inversion method, conjugate gradient inversion method, relaxation inversion method based on a combination of modern optimization algorithms optimization algorithm. OCCAM inversion method is the difference with the model of integrated data fitting smoothness demand anti performances close to most smooth data model. OCCAM inversion, by Weerachai Siripunvaraporn and Gary Egbert conduct improved OCCAM inversion process of conversion from the model space domain to the data space, the inversion of magnetotelluric data and data space. Data space inversion reduce the order inversion process for solving equations, and the model covariance and data covariance inversion process, thereby reducing the amount of computation, reduced memory requirements, and to some extent, improve the inversion efficiency. The inversion of the data space technology is introduced into the inversion of DC resistivity method, combined with the wave number space domain Jacobian matrix calculation, DC resistivity method data space D inversion method. Forward 2.5D DC resistivity method, the data space inversion method, and the wavenumber domain Jacobian matrix technology to achieve the DC resistivity method data space dimensional inversion algorithm technology. And synthetic data inversion algorithm to verify and confirm the reliability and accuracy of the algorithm. Finally, the data space inversion algorithm to the inversion of a set of measured data, the inversion results and its geophysical interpretation, further validation of the general applicability of the inversion algorithm. Finally, summarize the advantages and disadvantages of the algorithm and the proposed algorithm, namely the idea of ??the three-dimensional inversion of the data space.

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