利用三维地震资料解释煤层采空区的方法研究

Research on the Application of 3D Seismic Data to Interpretation of the Coalseam Mining-out Area

以铁法矿区大隆矿东三采区周边煤层采空区的三维地震资料解释为例,在分析煤层采空区岩层形变机理及地质特征的基础上,介绍三维地震反射特征及沿层地震属性分析技术在煤层采空区解释方面的特点。通过示例研究表明:由于煤层采空区上覆岩层的坍塌及形变,致使该区域不能形成反射波或反射信号微弱,采空区上部出现波速降低,地震反射波时间明显出现下拉现象;采空区范围内地震波振幅变弱,致使出现煤层反射波零乱及地震波同相轴中断现象。该区三维地震资料解释煤层采空区的研究成果证实,以现在地震地质解释精度,能够为煤层采空区周边工作面的合理布置和采空区探放水提供可靠的地质依据。

With 3D seismic data interpretation of the mining-out area in the coal seam around Dongsan Mining Area,Dalong Mine,Tiefa as the example,based on the analysis of deformation mechanism and geological features of the rock stratum in the coalseam mining-out area,this paper gives an introduction of the application of technology of 3D seismic reflection features and seismic attribute analysis to the interpretation of coalseam mining-out area.It is shown by examples that reflected waves can't be formed or reflection signal becomes weak,and such phenomena as the decrease in wave velocity and obvious down-stretching of the seismic reflection time appear for the upper mining-out area because of the collapse and deformation of the overlying rock stratum on the coalseam mining-out area;Within the mining-out area,the reflection amplitude becomes weak,resulting in the coalseam reflection disorder and interruption of the reflection event.It is proven,based on the research of application of 3D seismic data to interpretation of coalseam mining-out area,that present seismic and geological interpretation precision can provide reliable geological basis for reasonable layout of the surrounding work face and exploration and drainage of water in the coalseam mining-out area.