Seismic identification method and device for a concealed collapsed column

Abstract

The invention discloses a seismic identification method and device of a concealed collapse column. The method comprises the following steps of obtaining original seismic data in a target area throughusing a wide azimuth observation system; then using an OVT domain data processing technology to process so as to obtain a high-resolution omnibearing three-dimensional data volume; carrying out targethorizon calibration and horizon tracking; constructing and filtering the omnibearing three-dimensional seismic data volume after horizon calibration, and carrying out waveform difference body attribute and fault probability body attribute extraction; using a principal component analysis method to calculate the above two components to obtain a new attribute data volume, and extracting an interlayer attribute; and then, superposing the new attribute data volume and the filtered three-dimensional seismic data volume, and identifying the concealed collapse column according to a superposed three-dimensional seismic data volume profile and the interlayer attribute of the new attribute. Identification accuracy of the collapse column, a concealed collapse column boundary and a falling height is improved.

Description

technical field [0001] The invention relates to the technical field of identification of collapsed columns, in particular to a method for seismic identification of a hidden column of collapse and a device for seismic identification of a hidden column of collapse. Background technique [0002] In recent years, coal mine accidents have occurred frequently, and mine water inrush has become one of the important factors affecting mine safety production. The hidden subsidence columns and hidden fault structures in the lower part of the main coal mining seam have become the main geological causes of "concealed disasters" in coal mining areas. Because of the hydraulic connection between the Austrian limestone karst water, various aquifers and surface water, once an underground water inrush accident occurs, it will bring extremely heavy economic losses to coal enterprises. Furthermore, improving the accuracy of detecting hidden collapsed pillars is the main way to achieve safe produc...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the large impedance difference between the coal seam and the non-coal seam, a strong reflection event is generated on the seismic section, which will make the effective information submerged in the strong reflection of the coal seam, and the top interface of the hidden collapse column of the coal seam is at When the bottom of the coal seam is below the bottom of the coal seam, because the reflected waves generated by the top and bottom interfaces of the coal seam take away a lot of energy, the reflected waves generated by the top interface of the karst cave below the coal seam and the diffracted waves outside the column have weak energy and low frequency; effective identification

[0005] (2) When the collapsing column does not penetrate the coal seam and the distance from the top interface of the normal sedimentary coal seam is less than the vertical resolution of seismic exploration, the reflected wave from the coal seam roof is combined with the reflected wave from the top interface of the collapsing column. The obvious diffracted waves outside the column, the characteristics of the reflected wave group of the coal seam floor are discontinuous, and sometimes they are almost connected with the intra-column interference wave generated by the collapsed column, resulting in the illusion that the reflected wave of the coal seam floor is not broken

[0006] (3) Since the austrian limestone interface is an unconformity interface, the difference in its wave group resistance is small, resulting in weak energy and poor continuity of the reflected wave. Clearly concealed collapse columns are severely limited

And the accuracy of identifying hidden collapsed columns is relatively low

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