煤层尖灭地震正反演技术研究

Research on forward and backward modeling of coal seam pinch out earthquake

沉积环境及岩浆岩侵入常常引起煤层厚度的变化,在煤矿开采过程中,煤层厚度的变化常常困扰着煤矿的巷道布设及安全生产,尤其是煤层尖灭影响更为严重。作为煤炭勘查主要手段之一的地震勘探,其数据中蕴含了大量的岩性信息,通过分析提取煤层、顶底板等岩性物性信息,构建地质模型,进行正反演模拟,以证实煤层变薄乃至尖灭时,其对地震反射波的频率、振幅、相位等地震属性的影响较为明显,并在此基础上总结出约束反演的分辨率受地震子波主频及频宽的制约。

The sedimentary environment and magmatite intrusion often caused by changes in thickness of coal seam,in the process of coal mining,coal seam thickness change often affects roadway layout and coal mine production safety,especially coal seam pinch effect was more severe.How to find out the change of coal seam thickness and its pinch out situation has become a top priority for geologists today.As one of the main means of seismic exploration for coal exploration,the data contained a lot of information extraction of lithology,coal seam,roof and floor and other information through the analysis of lithology,geological model construction,inversion simulation,to prove that the coal seams and pointed out,its influence on the seismic reflection wave frequency,amplitude,phase the seismic attributes such as the more obvious,and on the basis of summing up the resolution by restricting the inversion of seismic wavelet frequency and bandwidth.