Method of Determining Dislocation Quantity of Hidden Active Fault Using Susceptibility Logging Method
A technology of active faults and magnetic susceptibility, applied in the field of geological exploration, can solve the problems of no logging technology, achieve the effects of improving reliability and accuracy, improving efficiency, and good application prospects
Active Publication Date: 2021-04-27
北京防灾科技有限公司
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Problems solved by technology
This technology has been widely used in oil exploration, and also in the exploration of coal, metal minerals, and groundwater resources. However, there are no literature reports and patents on the application of logging technology in active fault detection. We are developing active faults in Sanhe City In the detection work, the logging technology is first used to obtain objective, reliable, high-precision, digital drilling information, so as to determine the fault position and its dislocation amount
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[0020] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] In this study, the GeoVista comprehensive logging tool sold by Beijing Judeng Geophysical Exploration Company was used, and its measurement parameters are apparent resistivity, natural gamma ray and magnetic susceptibility. GeoVista magnetic susceptibility probes, commonly referred to as MAGS, are primarily used in the exploration of magnetite, pyrite and hematite deposits. It can identify formations containing magnetite in concentrations ranging from 0.005% to 100%.
[0022] 1) According to the inferred fault position in the shallow seismic exploration profile, lay out drill holes across the concealed active fault to be detected ( figure 1 ). Generally, it is required that row drill holes should be laid vertically across the fault....
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The invention relates to a method for determining the dislocation amount of a concealed active fault by using the magnetic susceptibility logging method, which comprises the following steps: 1) according to the fault position inferred in the shallow seismic exploration section, arranging rows across the concealed active fault to be detected Drilling; 2) drilling cores, observing cores, and compiling core histograms; 3) after each drilling is completed, it is necessary to change the mud with clean water to clean out the mud in the well so that the logging data is accurate and reliable; 4) Logging with logging equipment; 5) Using the data processing software that comes with the equipment for data processing to form the magnetic susceptibility curve of each borehole, and then superimposing the magnetic susceptibility curve with the drilling histogram for comparative analysis. The magnetic susceptibility logging curve of the invention can greatly improve the reliability and accuracy of detecting the position and dislocation amount of active faults by drill holes.
Description
technical field [0001] The invention relates to the field of geological exploration, in particular to a method for determining the dislocation amount of hidden active faults using a magnetic susceptibility logging method. Background technique [0002] Active faults are the chief culprit of major earthquakes. The Wenchuan magnitude 8 earthquake that occurred in Sichuan on May 12, 2008 was caused by active faults in Longmen Mountain. Carrying out active fault detection, finding out the location of the fault and its various parameters are extremely important tasks in disaster prevention and mitigation. In eastern China and other regions, many active faults do not reach the surface, but are hidden in the Quaternary strata. For example, the Tangshan M7.8 earthquake on July 28, 1976, which caused more than 240,000 deaths, was caused by the hidden faults in the Quaternary strata. caused by active faults. For the detection of hidden active faults, it is necessary to carry out seri...
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IPC IPC(8): G01V3/26G01V3/38
CPCG01V3/26G01V3/38Y02A90/30
Inventor 沈军焦轩凯刘玉戴训也刘泽众
Owner 北京防灾科技有限公司