复合煤层中夹矸对槽波探测解释断层落差的影响

Influence of parting in composite coal seam on interpretation of fault throw by channel wave seismic exploration

槽波地震勘探技术在探测工作面内部断层、陷落柱发育情况、煤厚变化等方面已经取得较好的应用效果,现已成为井下地质构造探测的首选方法。但对于含夹矸的复合煤层地质构造的探测,槽波方法还存在一定的问题,为研究复合煤层中夹矸对槽波地震探测中断层落差解释的影响,通过建立不同的数值模型进行正演分析,并选取山西某矿复合煤层进行槽波探测试验。研究结果表明:复合煤层中的夹矸对槽波探测解释断层落差有较大影响,夹矸的厚度与煤层差异较小时,槽波探测解释断层落差时的单位煤厚标准应为复合煤层的总厚度;差异较大时,单位煤厚标准应为激发接收层的单一煤层厚度。研究结果可为槽波实际资料的解释、分析提供参考依据。

The channel wave seismic exploration technology has achieved relatively reliable result in detection of faults,collapse columns and the change of coal thickness in working faces,now becomes the preferred method for detection of underground geological structures.But for detection of geological structures in partings of composite coal seams the method has still certain problems.In order to study the influence of partings in composite coal seams on detection of channel wave seismic exploration,various models were built by changing thickness,lithology of parting in composite coal seams and experimenting with channel wave seismic detection in Shanxi to study how those parameters influence the exploration precision of channel wave seismic.The results show that the partings of composite coal seams have big influence on interpretation of fault throw by channel wave seismic detection,when the difference between the parting thickness and the seam thickness is smaller,in interpretation of fault throw,the unit coal thickness standard should be the total thickness of a composite coal seam,when the difference is bigger,the unit coal thickness standard should be the thickness of a single seam for a stimulating and receiving layer.The achievements can provide a basis for seismic data interpretation and analysis.