频谱分解技术在煤田精细构造解释及煤含气性预测中的应用

Application of spectral decomposition for fine seismic structural interpretation in coalfield and gas-bearing property predication of coal seam

以煤田三维地震的应用为例,结合其他地震资料解释技术,利用断层等构造引起的相位调谐体上相位不稳定的特性,对山西阳泉矿区南部某矿三维地震资料进行精细构造解释,发现一些常规解释技术难以发现的断距小于5 m的小断层;并基于煤层气(瓦斯)富集引起的高频吸收衰减特性,利用不同频率的调谐振幅变化,预测了研究区15号煤层的含气性.

Spectral decomposition was firstly applied in seismic fine structural interpretation based on a coal mine 3D data from the south of Yangquan coal zone in Shanxi Province, and combined with other interpreted techniques, some minor faults with throw lower than 5 m, which was difficult to be recognized, can be controlled and predicted in term of the phase instability which were found in the phase data cube and caused by faults. Subsequently, based on the characteristic of the intense attenuation for high frequency seismic energy resulted from the enrichment of gas in coal seam, the gas-bearing properties of No. 15 coal seam was predicated by studying the relationship of tuning amplitude variation verse different frequencies in the frequency-amplitude tuning volume.