煤田数字高密度地震勘探的应用效果探析

On application effectiveness of digital high-density seismic prospecting in coalfield

以2007年丁集煤矿数字高密度三维地震试验为例,讨论了数字检波器的技术特点及利用数字检波器进行高密度地震勘探的应用方法。在煤田勘探中采用数字检波器单点高密度采集,提高了空间采样率,有效避免空间假频的出现;同时干扰波无假频采样有利于后期信噪分离处理,提高干扰波压制效果。丁集煤田完成的多块数字高密度地震勘探的效果表明:采用单点数字检波器进行高密度地震勘探有利于提高地震资料的保真度和分辨率,有利于煤田小断层、陷落柱和微幅构造的识别和成像,从而降低潜在安全风险,保障煤田的生产安全和提高生产效益。

Taking the digital high-density 3D seismic experiment in Dingji Mine in 2007 as the example, this paper discusses the technical characteristics of digital geophone and its application in high-density seismic prospecting. Adopting the digital geophone to conduct the singlepoint high-density data acquisition for coalfield seismic prospecting, improves the spatial sam- pling rate and effectively avoids the spatial aliasing; meanwhile, the non-aliasing sampling benefits the final signal-noise separation and betters the interference wave attenuation. The results from several digital high-density seismic prospecting in Dingji Mine prove that the high-density seismic prospecting with single-point digital geophone is beneficial to improving the fidelity and resolution of the seismic data, and benefits the recognition and imaging of the small faults, collapsed pillars and microstructures, so, the potential security hazards are reduced and the production safety of coalfield is guaranteed and its production benefit is improved.