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A Method for Identifying Geological Anomalies Using Two-dimensional Apparent Resistivity Data

A technology of apparent resistivity and geological anomalies, which is applied in the field of engineering geophysical exploration, can solve problems such as two-dimensional apparent resistivity data analysis methods for poor geological bodies, and achieve enhanced detail display effect, intuitive image information, and rich image information Effect

Active Publication Date: 2017-11-17
CHANGJIANG GEOPHYSICAL EXPLORATION & TESTING WUHAN CO LTD +1
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Problems solved by technology

[0003] Aiming at the problems existing in the current method of analyzing unfavorable geological bodies using the two-dimensional apparent resistivity data obtained by the magnetotelluric method, the present invention provides a method for identifying geological anomalies using the two-dimensional apparent resistivity data. The technical solution is:

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  • A Method for Identifying Geological Anomalies Using Two-dimensional Apparent Resistivity Data
  • A Method for Identifying Geological Anomalies Using Two-dimensional Apparent Resistivity Data
  • A Method for Identifying Geological Anomalies Using Two-dimensional Apparent Resistivity Data

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Embodiment 1

[0049] Shigu Wangchengpo Xianglushan Tunnel is the most critical control project for water diversion in Central Yunnan. The tunnel has a long distance and a large buried depth, so problems such as mud and water inrush are very likely to occur during the construction process, which poses a huge hidden danger to construction safety. In order to analyze the unfavorable geological body information in the magnetotelluric geophysical prospecting data (two-dimensional apparent resistivity data) obtained in the previous exploration, a method for identifying geological anomalies using two-dimensional apparent resistivity data is adopted, which is based on two-dimensional apparent resistivity data Using the data mining method combining wavelet transform and image enhancement expression to identify geological anomalies, the identification method is carried out in the following steps:

[0050] ① Use the gray scale transformation function T(r) to perform histogram equalization on the two-d...

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Abstract

The invention relates to a method for recognizing a geological anomalous body through employing two-dimensional apparent resistivity data, and belongs to the technical field of engineering geophysical exploration. The method specifically comprises the steps: recognizing a local singular point of a signal for the apparent resistivity data, obtained in a research area through employing a geophysical prospecting method, through employing the close correlation of the position of a modulus maximum value of a discrete binary wavelet transform coefficient with the local singularity of the signal, and quantitatively analyzing the boundary information of the geological anomalous body; meanwhile, enhancing the detail contrast of an apparent resistivity image through employing a histogram equalization method, combining two sides for data analysis, and obtaining the information of an underground geological anomalous body . The method can enable the obtained image information to be more abundant and visual, reduces the impact from human factors, and improves the boundary recognition precision of a bad geological anomalous body. The method can carry out the effective analysis of the geophysical prospecting data, achieves more precise description of anomalous regions, such as a fault, a crushed zone, a karst cave and so on, and provides a scientific basis for the design and construction.

Description

technical field [0001] The invention relates to a method for identifying geological anomalies using two-dimensional apparent resistivity data. The method is used for the analysis and processing of magnetotelluric geophysical prospecting data. Specifically, data analysis is performed on the raw geophysical prospecting data collected by magnetotelluric method to obtain underground Information on geological anomalies. It belongs to the technical field of engineering geophysical prospecting. Background technique [0002] The magnetotelluric method is a geophysical prospecting method often used in engineering geophysical prospecting, and it is mainly used to detect unfavorable geological information in underground rock formations. The data acquired by this method are two-dimensional apparent resistivity data. Conventional geophysical interpretation based on two-dimensional apparent resistivity data to identify geological anomalies is mainly inferred and interpreted based on the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 张建清蔡永香刘方文刘挺马圣敏况碧波
Owner CHANGJIANG GEOPHYSICAL EXPLORATION & TESTING WUHAN CO LTD
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