There were many mature methods for determining reservoir thickness, such as amplitude method, et al. The seismic amplitude of thin bed will obviously change, however, when its physical or lithological properties, such as oil or gas bearing properties, vary. Consequently, the thickness of the thin bed determined by its amplitude is incorrect. By analyzing the refliectivity spectrum and reflection wave spectrum of thin beds, we put forward a new method for thickness determination of the thin beds. The testing results by model are satisfactory.%薄储层厚度的计算已有不少成熟的方法，如振幅法等。然而，仍存在不少的问题。例如，对于薄储层厚度的计算一般都主张采用振幅方法，但是，如果该薄储层的某一范围由于物性或岩性的变化(如含有油气等)，则将引起振幅的显著变化，此时使用振幅去计算薄层厚度无疑会出现错误的结果。作者通过研究地层厚度变化对地层本身的反射系数谱及反射波频谱的影响规律，寻找到了一种新的计算薄层厚度的方法。模型试算表明，效果理想。
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