用地震反射波定量解释煤层厚度的方法

QUANTITATIVE INTERPRETATING METHOD OF COAL USING SEISMIC REFLECTED WAVE

一、引言 工业可采煤层厚度一般为1.5m,如何从地震资料上准确圈定1m厚的煤层边界、并定量解释煤层厚度、准确计算地质储量,国外一些学者研究了薄层地震反射波的动力学特征与薄层厚度的关系后,得出了不同的薄层垂直分辨率标准,Widess用零相位子波作实验时,发现当薄层厚度为λ/8(λ是地震子波的主波长)时,反射波形正好是入射波的导数,并可直观地鉴别顶底反射;Kallweit利用可控震源研究了薄层响应的频谱后,提出了分辨地震波的极限为1/(1.4f)(f为地震子波的上限频率),经主频换算后。

The development of seismic exploration technique expands the area of seismic technique applied to coal geological explorationl. The seismic prospecting has been developed into litho-logic exploration and quantitative interpretation of coal bed. This paper discussed the simulation of the reflected wave of coal bed by using the physical modelling. Experiments of quantitative interpretation of coal bed thickness have been done for physical model and field seismic data. Results of practical interpretation show that this method is comparatively good.