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Simulation and Application of Forward Modeling and Inversion of High-density Resistivity Survey

Author: YuWenFu
Tutor: XiaoHongYue
School: Chengdu University of Technology
Course: Applied Geophysics
Keywords: High-density electrical Forward modeling and inversion Probing depth Lateral resolution Quantitative interpretation
CLC: P631.3
Type: Master's thesis
Year: 2011
Downloads: 301
Quote: 1
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Abstract


In recent years, high-density resistivity method more widely used in engineering exploration, and has a more successful application of precedent. Forward, Inverse is the main research methods in the high-density resistivity method has very important significance, theoretical research, data processing, and data interpretation. High density resistivity method exploration of existing research results, combined with the practical experience of the author, forward the high-density resistivity method, inversion of the theoretical study of the technology used in high-density resistivity method and results for the actual exploration work, the value of theoretical research in guiding practice. The main contents are as follows: First of all, from the midpoint of the homogeneous medium power underground electric field distribution law, discussed in detail the theoretical basis of the exploration of the DC resistivity method, a brief introduction to abnormal body mechanism of apparent resistivity and electrical profiling method, the basic principles of electrical sounding. Then, by the basic principles of conventional resistivity prospecting, exploration theory leads to the high-density resistivity method, a brief overview of the working principle of the high-density resistivity method, common device type, and model test method for high density The resistivity method, inverse modeling technology as well as T ratio parameters are discussed in detail. Based on this, on the one hand, of the abnormal amplitude and the relationship between the resistivity difference, summed electrical conditions required for the actual exploration; on the other hand, for different ground geological conditions in the ideal state, respectively, a comparative study of common devices exploration depth, resolution, and analyzes the impact of various factors on. For high density resistivity quantitative interpretation difficult problem, the article describes the algorithm based on the depth of the borehole data correction method and forward the theory-based target, and spreadsheet model to verify the latter in the quantitative interpretation viable and effectiveness. Finally, the research results are applied to the engineering and exploration in the following two aspects: (1) the actual data collection: can be used to guide the selection of the acquisition parameters, in order to improve the quality of data acquisition and exploration resolution; (2) data interpretation: the presence of abnormal noise and non-target body be measured apparent resistivity cause some interference and interference in the processing is difficult to identify or remove causes the inversion of a cross-sectional view of the target body caused by abnormal become less clear or even cover up, directly based on the inversion results interpretation, often result in larger deviations in the interpretation. Therefore, the processing and interpretation of the measured data, in addition to the inversion, T ratio parameters and objectives algorithm for data processing and interpretation, the inversion of a cross-sectional view with a different exception effectively separate and found that the inversion possible to reveal a sectional view of an exception. By construction excavation or drilling results contrast that interpretation results in good agreement with the actual situation.

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