论文部分内容阅读
通过对煤田瓦斯突出煤体的煤层孔隙性、裂隙、含气性等岩石物性以及弹性特性分析研究,结合煤田地质特征建立了地震地质模型,并进行了正演模拟,重点对含有游离气煤层的地震响应特征进行研究。研究表明:裂隙的存在使地震波速度降低,地震波速随围压的增大而增大。煤层中瓦斯含量与震波波速具有线性相关关系,在瓦斯富集区域,其地震合成记录发生下凹,时间上发生延迟但反射波的连续性好,说明瓦斯富集区域的地震波速明显比非突出区域低。
Based on the analysis of the petrophysical properties and elastic properties of the coal seams, coal fissures and gas-bearing coal seams in coalfields, the seismic geological model was established based on the geological features of coalfields and the forward modeling was carried out. Earthquake response characteristics of the study. The research shows that the existence of fissures reduces the velocity of seismic waves and the velocity of seismic waves increases with the increase of confining pressure. The gas content in the coal seam has a linear relationship with the seismic wave velocity. In the gas-enriched area, the seismic synthetic record is concave and time-delayed but the reflected wave continuity is good, indicating that the seismic velocity in the gas- Low area.