Research And Application Of Seismic Attributes Identification In Coal Seam Sliding Structural Region

In coal mining areas,the existence of coal seam sliding structure can lead to tectonic coal development and ground stress concentration,Increasing the risk of coal and gas outbursts;At the same time,the stability of the roof and floor of the coal seam will be deteriorated and increase the risk of water inrush;In addition,the coal seam sliding structures often cause sharp changes or even lost in coal seam thickness,affecting the layout of mining engineering seriously.Therefore,the delineation of the coal seam sliding zone has important research significance and practical value for coal mine design,safe and efficient mining.There are many performance characteristics of coal seam sliding structure,showing abrupt changes in coal seam thickness,development of tectonic coal,and top and bottom cracking.This paper selects coal seam thickness abrupt zone and tectonic coal development zone as research objects,based on its overlapping area,multi-information fusion to delineate the coal seam sliding structure area.Firstly,the seismological geological model of coal thickness variation and development of tectonic coal was established.The forward modeling and seismic attribute analysis were carried out to study the relationship between coal thickness variation,tectonic coal development and seismic attributes.The results show that when the thickness of coal seam is less than the tuning thickness,the amplitude properties such as the main amplitude and amplitude maximum increase with the increase of coal thickness,and the attenuation coefficient of the reflected wave frequency of tectonic coal is larger than that of the raw coal;The absorption of high-frequency components of the reflected wave by coal causes the high-frequency component energy to be strongly attenuated,so the reflected energy of the tectonic coal is weak.Seismic data attribute analysis of the strata-sliding structure exposed in a machine lane in the study area has further verified the validity of the analysis of coal seam thickness and the seismic attribute analysis of the development of tectonic coal,and proved the feasibility of the seismic data to delineate the coal seam sliding structure.Taking a certain mine in Huaibei,Anhui Province as an example,this paper studies the spectral moment method,model-based wave impedance inversion method and BP neural network method inversion based on geological and logging data,based on 3D seismic data and borehole data.The thickness of the coal seam and the multi-information fusion technique based on the weighted average method are used to divide the coal seam thickness abrupt zone.The seismic attributes of the target coal seam in the study area were extracted and analyzed to identify the tectonic coal.The PCA-RGB multi-attribute fusion technology was used to identify the tectonic coal development area.In the end,the coal seam thickness and the tectonic coal development area were combined to determine the coal seam sliding structure area based on its overlapping area.The comparison shows that the predicted results of coal thickness and tectonic coal development are in good agreement with the existing borehole and coal thickness data.The application of actual seismic data shows that it is effective and feasible to study coal thickness and tectonic coal in seismic attributes method,and then to identify the coal seam sliding structure,which is suitable for the delineation of coal seam sliding structures in similar mining areas of Huaibei coal mine.