煤层厚度与振幅、频率地震属性的正演模拟

Forward Modeling of Relationship Between Coal Seam Thickness and Seismic Attributes of Amplitude and Frequency

依据地质、地震资料设计了地震地质模型,模拟了在煤层缺失、剥失、分叉、合并等情况下反射波振幅、频率等地震属性;同时讨论了这些属性对不同煤层厚度灵敏度.结果表明,当煤层厚度为0-8m时,振幅、频率地震属性与煤层厚度之间存在一单调非线性关系;当煤层厚度为8-13m时,只有频带宽度作为煤层厚度预测唯一参数;当煤层厚度大于13m时,根据煤层顶、底板反射波旅行时与速度预测煤层厚度.

Based on geologic and seismic interpretation, the seismic geological model was designed. The seismic attributes of reflected wave amplitude and frequency in the situation of loss, denudation, pinch-out, and merging of coal seams was simulated. The sensitivity of such attributes to the thickness of different coal seams was discussed. The result shows that 1) when the thickness of coal seam is 0-8 m, there is a monotone nonlinear relation between amplitude or frequency and thickness; 2) when thickness is 8-13 m, only the frequency band can be used to predict thickness; and 3) if the thickness is more than 13m, the thickness is determined by calculating the velocity and the travel time of both roof and floor.