Method for analyzing and extracting structure of ore deposit cluster based on passive source seismic wave field

Abstract

The invention discloses a method for analyzing and extracting the structure of an ore deposit cluster based on a passive source seismic wave field, which comprises the following steps of: establishing a variable-view system in the range of a selected ore deposit cluster; acquiring passive source original data of different high and low frequency bands to obtain seismic body waves, seismic surface waves and background noise data of the selected ore deposit cluster; calculating a receiving function; processing the passive source original data to obtain a speed model of the selected ore deposit cluster; obtaining interface structure models of different frequencies based on the speed model and the receiving function; performing absolute wave impedance inversion and relative wave impedance inversion based on the receiving function to obtain an underground density model; performing signal analysis in a curvelet domain in a three-dimensional coordinate system; extracting anomalies in the near vertical direction to obtain an ore-containing magma channel structure; and performing spatial filtering on the three-dimensional speed model, the three-dimensional interface structure models, an underground three-dimensional density model and the three-dimensional magma channel structure data to obtain three-dimensional structure data of the selected ore deposit cluster. Rapid and accurate analysis of geology is realized.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method for extracting ore concentration area structure based on passive source seismic wave field analysis. Background technique [0002] The use of seismic waves to control the earth's structure is characterized by the fact that detecting rock layer structure is the most basic task in the study of earthquake dynamics. For this reason, people use artificially excited seismic waves for detection. The excitation time and source location of artificially excited seismic waves can be controlled artificially. On the one hand, the construction cost of artificial earthquake method is expensive, on the other hand, the seismic wave energy excited by artificial earthquake is limited, so that the detection depth is limited, and the natural earthquake releases huge energy when it is invented, and when the natural seismic wave propagates in the earth, reflection, refraction and...

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Problems solved by technology

[0002] The use of seismic waves to control the earth's structure is characterized by the fact that detecting rock layer structure is the most basic task in the study of earthquake dynamics. For this reason, people use artificially excited seismic waves for detection. The excitation time and source location of artificially excited seismic waves can be controlled artificially. On the one hand, the construction cost of artificial earthquake method is expensive, on the other hand, the seismic wave energy excited by artificial earthquake is limited, so that the detection depth is limited, and the natural earthquake releases huge energy when it is invented, and when the natural seismic wave propagates in the earth, reflection, refraction and Conversion, accompanied by complex phenomena such as dispersion and absorption attenuation, forms complex wave trains. These seismic phases reach the surface along their respective propagation paths with various medium information on their propagation paths. At present, broadband seismometers are used The information is collected, processed, and the receiver function is calculated and inverted. In the process of processing, many approximate calculations are used to derive the two-dimensional geological structure. This method does not combine high-frequency seismic signals, and the calculation process The approximation of the geological structure is obtained, and the fine geological ore body structure cannot be obtained.

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